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Chicamauga Reservoir 1988 Fisheries Monitoring Cove Rotenone Results
	ML20247J761
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Site:	Sequoyah
Issue date:	06/30/1989
From:	Dawn Powell; TENNESSEE VALLEY AUTHORITY
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TENNESSEE VALLEY AUTHORITY River Basin Operations Water Resources CHICKAMAUGA RESERVOIR 1988 FISHERIES MONITORING COVE ROTENONE RESULTS Prepared by Douglas H. Powell Aquatic Biology I

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I TVA/WR/AB--89/7 Chattanooga, Tennessee June 1989 I

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I TENNESSEE VALLEY AUTHORITY River Basin Operations Water Resources I l I

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-I CHICKAMAUGA RESERVOIR 1988 FISHERIES MONITORING COVE ROTE.iONE RESULTS Prepared by Douglas H. Powell Aquatic Biology I

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TVA/WR/AB--89/7 Chattanooga, Tennessee June 1989 I

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. CONTENTS i

Page

. Introduction . . .. . . ..... . . . . . . . . . . . . . . . . . .

1 Purpose and History. . .. . . . . . . . . . . . . . . . . . . 1 Watts Bar Nuclear Plant .. . . . . . . . . . . . . . . . . . 2 Sequoyah Nuclear Plant . . . . . . . . . . . . . . . . . . . . 2 Reservoir Description . . . . . . . . . . . . . . . . . . . . 4 Materials and Methoda . . . . . . . . . . . . . . . . . . . . . . . 4 Field . . . ... . . . .. . . . . . . . . . . . . . . . . . 5 Data Analyses ... . .. . . . . . . . . . . . . . . . . . . 6 Results and Discussion . . . . . . . . . . . . . . . . . . . . 7 Important Species . . . . . . . . . . . . . . . . . . . . . . 9 Gizzard Shad . . . .. . . . . . . . . . . . . . . . . . . 9 Threadfin Shad . . .. . . . . . . . . . . . . . . . . . . 10 Carp .

.. ... . .. . . . . . . . . . . . . . . . . . . 11 Bullhead Minnow .. . . . . . . . . . . . . . . . . . . . 11 Bluegill . . . . . .

. . . . . . . . . . . . . . . . . . . 12 Longear Sunfish

... . . . . . . . . . . . . . . . . . 12 Redear Sunfish . . . . . . . . . . . . . . . . . . . . . .

Smallmouth Buffalo .

, 13

. . .. . . . . . . . . . . . . . . . 13 Spotted Sucker . . . . . . . . . . . . . . . . . . . . . . 13 Channel Catfish . . . . . . . . . . . . . . . . . . . . . . 14 Flathead Catfish ... . . . . . . . . . . . . . . . . . 14 White Bass . .. . . . . . . . . . . . . . . . . . . . . . 14 Yellow Bass . . . . ... . . . . . . . . . .. . . . . . . 15 Warmouth . . . . . . . . . . . . . . . . . . . . . . . . . 16 White Crappie . . ... . . . . . . . . . . . . . . . . . 16 Sauger .

. .. . . . . . . . . . . . . . . . . . . . . . . 17 Yellow Perch . . . .. . . . . . . . . . . . . . . . . . . 17 Freshwater Drum . . .. . . . . . . . . . . . . . . . . . 17 Largemouth Bass

.. . . . . . . . . . . . . . . . . . . . 18 Summary

. . . . . .. .. . . . . . . . . . . . . . . . . . . 19 Conclusions and Recommendations . . . . . . . . . . . . . . . . . . 20 l References i Tables ........... . . . . .. . . . . . . . . . . . . . . . . .

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TABLES Number Page 1.. Characteristics of Rotenone Sites in Chickamauga Reservoir, 1970 through 1988 . ... . . . .. . . . . . .. . . . . . . . 27

2. Common and Scientific Names of Fish in Rotenone Samples Chickamauga Reservoir, 1988 . . .. . . . . . . . . . . . .. . 30

3. List of Fish Species Collected in Cove Rotenone Samples During Reoperation and Operational Fisheries Monitoring for Sequoyah Nuclear Plant, Chickamauga Reservoir, 1970-1988. . .. 31

4. Size Classes (Millimeters) Used in Fish Inventories . . . . . . 33

5. Mean Number and Weight (kg) of Fish per Hectare in Five Samples in Chickamauga Easervoir, 1988 .. . . . . .. 34

6. Percent Species Composition of Cove Rotenone Populations, Chickamauga Reservoir, 1988 .. . . . . . . . . . 35

7. Listing of Important Species Collected in Rotenone Samples from'Chickamauga Reservoir, 1970-1987 . . . . . .. . . 36

8. Number of Samples and Mean Annual Standing Stock (No./ha and kg/ha) of all Young, Intermediate, and Harvestable Size Fish Collected in Cove Rotenone Samples from Chickamauga Reservoir, 1970-1988 . .. . . . . . . . . ... .. .. . . . . 37

9. Percent Size Distribution of Major Fish Groups.

Chickamauga Reservoir, 1988 . . .. .. . . . . . . .. . . .. 38

10. Mean Annual Standing Stock (no./ha and kg/ha) of Game, commercial, and Forage Fish Collected in Cove Rotenone Samples from Chickamauga Reservoir, 1970-1988 . . .. . . . . . 39 f

11. Results of Linear Regression Analyses Indicating Significant Trends of Numbers /ha and/or kg/ha by Size Group of Important Fish Species Collected in Cove Rotenone Samples from Chickamauga Reservoir, 1970-1988 . .. . . . . ... . .... . ..... . . . .. . 40

12. Numbers and Biomass (kg) Per Hectare of Each Size Group of Gizzard Shad in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 . . . . . . . . . . .. . .. .. . . . . 42

13. Numbers and Biomass (kg) Per Hectare of Each Size Group

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' of Threadfin Shad in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 . . . . . . . . .. . . . ... . . . . . 43 iv

TABLES (Continued)

Number Page l

14. Numbers and Biomass (kg) Par. Hectare of Each Size Group of Carp in Cove Rotenone Samples, Chickamauga ,

Reservoir, 1970-1988 ..................... ,

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15. Numbers and Biomass (kg) Per Hectare of Each Size Group ]

of Bullhead Minnow in Cove Rotenone Samples, Chickamauga '

Reservoir, 1971-1988 .................... . 45'

16. Nuubers and Biomass (kg) Per Hectare of Each Size Group of Bluegill in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988

..................... 46 1- !

17. Numbers and Biomass (kg) Per Hectare of Each Size Group j of Longear Sunfish in Cove Rotenone Samples, Chickamauga j Reservoir, 1970-1988 . . . . . . . . . . . . . . . . . . . . . . 47 j

18. Numbers and Biomass (kg) Per Hectare of Each Size Group of Redear Sunfish in Cove Rotenone Samples, Chiakamauga I Res6rvoir, 1970-1988 ..................... 48

19. Numbers and Biomass (kg) Per Hectare of Each Size Group of smallmouth Buffalo in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 . . . . . . . . . . . . . . . . 49

20. Numbers and Biomass (kg) Per Hectare of Each Size Group i'

of Spotted Sucker in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 ..................... 50

21. Numbers and Biomass (kg) Per Hectare of Each Size Group of Channel Catfish in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 ..................... 51

22. Numbers and Biomass (kg) Par Hectare of Each Size Group of Flathead Catfish in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 .................. . . 52 r

23. Numbers and Biomass (kg) Per Hectare of Each Size Group of White Bass in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 ..................... 53

24. Numbers and Biomass (kg) Per Hectare of Each Size Group t of Yellow Bass in Cove Rotenone Samples, Chickamauga l Reservoir, 1970-1988 ..................... 54 V

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TABLES 1

(Continued) J Wumber Page

25. Numbers and Biomass (kg) Per Hectare of Each Size Group of Warmouth in Covo Rotenone Sample >s, Chickamauga Reseevoir, 1970-1088 . . . . .. . . , . ... . . . . . . . 55

26. Numbers and Biomass (kg) Per Hectava of *S ,ize Group of White Crappie in Cove Rotenone Sampies, Chickamauga Reservoir, 1970-1988 . . . . . . . .. . . . . .. . . .. . . 56

27. Numbers and Biomass (kg) Per Hectare of Each Size Group of Sauger in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 . . ... . . . . . . . . . .. . . . . . 57

28. Numbers and Biomass (kg) Per Hectare of Each Size Group of Yellow Perch in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 . . . . .. . . . . .. . .. . . .. . . 58

29. Numbers and Biomass (kg) Per Hectare of Each Size Group of Freshwater Drum in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 . . . . ,. . . . . . . . . . . . . . . . 59

30. Numbers and Biomass (kg) Per Hectare of Each Size Group of Largemouth Bass in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 . . . . . . . . . . . . . . . . . . . . . 60 l

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l CHICKAMAUGA RESERVOIR 1988 FISHERIES MONITORING COVE ROTENONE RESULTS INTRODUCTION I 1

Purpose and Mistory TVA is required by the National Pollutant Discharge Elimination System (NPDES) Permit for Sequoyah Nuclear Plant (SQN) to conduct and report annually an operational nonradiological monitoring program to evaluate potential effects of SQN on Chickamauga Reservoir. The monitoring, program was initially designed to identify major changes

in water quality end biological communities in Chickamauga Reservoir resulting from operation of SQN. Results of monitoring conducted from 1980-87 (reported in TVA, 1982, 1983a, 1984, 1985, 1986b, 1987, and 1988) identified few significant changes in Chickamauga Reservoir considered to be related to operation of SQN. Based on absence of nuclear plant-induced effects and fulfillment of the monitoring period required by the NPDES permit, some components of the program were terminated. Cove rotenone studies were continued because they remain the best overall fish sampling method for determining reservoir-wide quantitative and qualita-tive changes in fish populations. The cove rotenone studiec conducted on Chickamauga Reservoir as part of SQN monitoring are also conducted as part of the monitoring program for Watts Bar Nuclear Plant (WBN). These studies will be useful in evaluating the combined effects of operating two nuclear facilities on one reservoir once both nuclear plants become operational on a full-time basis.

The purpose of this report is to present results of cove rotenone studies conducted on Chickamauga Reservoir in 1988.

I Watts Bar Nuclear plant WBN is under construction on the west bank of Chickamauga Reser-voir near Tennessee River mile (TRM) 528.0 (figure 1), approximately two miles downstream from Watts Bar Dan. WBN will be operated in closed cycle cooling mode, with only blowdown from two cooling towers to be discharged through multiport diffusers located in the main channel at TRM 527.8. Makeup water will be pumped from an intake channel located at TRM 528.0. Maximum intake pumping flowrate is approximately 4.5 m /s (160 cfs), which represents about 0.6 percent of the long-term average flow past WBN of 767 m /s (27,100 cfs).

Sequoyah Nuclear plant SQN is located on the west shore of Chickamauga Reservoir at TRM 484.5 (figure 1). It has two pressurized water reactors with a total nameplate rating of 2,441 MWe. Condenste cooling water (CCW) is withdrawn from the cooler lower strata of Chickamauga Reservoir under a deep skimmer wall, situated near the 13-m deep river channel.

Water leaving the condensers can be routed in one of three ways: (1) to the diffuser pond and out the diffuser pipes (open mode); (2) through the cooling towers, then to the diffuser pond and out the diffuser pipes (helper mode); or (3) through the cooling towers and recirculated to the intake (closed mode) with only blowdown discharged through the diffuser pipes. An underwater dam crosses the river channel approximately 75 m upstream from the diffuser, decreases the likelihood of any upstream

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warm water wedge from the thermal discharge, " impounding" cooler water in lower strata of the teservoir near the plant intake.

In August 1985, both units at SQN were shut down. Unit 2 operated (

intermittently in May and June following restart in May 1988. Continuous j 1

operation occurred from early July through the end of 1988.

Resetvoir Description Chickamauga Reservoir is formed by Chickamauga Dam, situated at TRM 471.0. Water elevation normally varies from 205.7 m (675 ft.) msl in winter to 208.0 m (682.5 ft.) msl in summer. At elevation 208 m msl, the reservoir is 94.8 km (58.9 mi) long on the Tennessee River and extends 51.5 km (31 mi) up the Hiwassee River. Mean annual travel time through the reservoir is approximately 7 days. Monthly average travel times range between four days (February) and 11 days (May). According to current operating guidelines, TVA attempts to maintain a minimum daily average discharge of 170 m /s (6,000 efs) from Chickamauga Reservoir.

MATERIALS AND METHODS Cove rotenone sampling is a quantitative and qualitative sampling method. The fish population in a cove is isolated from the reservoir by a block net extending across the cove. Toxicant (rotenone) is applied throughout the water column and fish are collected as they surface. Fish not collected initially are picked up the sub;equent day once they float to the surface. This type of sampling gives estimates of fish popula-tions in coves. These estimates do not necessarily represent true population estimates of the entire reservoir because fish species

are not distributed evenly throughout the reservoir. However, useful estimates are possible for certain species which orient more toward shoreline or structure than open water habitat during all or part of l l

their life cycle. Considering these limitations, cove rotenone sampling i is the best overall method for estimating relative abundance of many fish i species in southeastern reservoirs. Cove rotenone data provide estimates of reproductive success, year-class strengths, and relative fish stock sizes in a given year and in determining long-term trends in these parameters for various species in a reservoir.

Fish sampling with rotenone was initiated in Chickamauga Reservoir in 1947 to determine standing stock (numbers /ha and kg/ha) of game, prey, and commercial fish species. Samples were taken at various locations, primarily in coves, annually through 1959 (except for 1948 and 1953). In addition to standing stock information, these data provided species occurrence and composition information and characterized the general fish community of the reservoir. Sampling was discontinued after 1959, but was resumed in 1970 to collect preoperational data for monitoring possible impacts from the operation of SQN.

Field Rotenone sampling procedures in TVA were standardized after 1960 to include use of block nets and standard survey techniques. Sampling in Chickamauga Reservoir from 1947 through 1959 was characterized by use of varying techniques for determining area and volume of the sample site and varying or undescribed sampling and subsampling techniques. Cove rote-none sampling since 1970 was designed to eliminate certain biases through

the establishment of better criteria for sample sites and standardization of field techniques.

Criteria for an acceptable rotenone site are: (1) surface area at least 0.4 ha; (2) depth not more than 7.5 m where block net is set; 1 (3)-location not adjacent to or within the same cove as housing develop-mente, boat docks, or other recreation areas which would impact the area, 1

and (4) absence of sensitive habitats. Some changes in cove sites were. )

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made after 1970; however, from 1980 to 1986 the same five coves were 1 i

sampled each year in Chickamauga Reservoir. These coves were located at i I i TRM 476.2, 478.0, 495.0, 508.0, and 524.6. Because of housing develop-h' ment in the area of the cove at TRM 495.0, this cove wat relocated to TRM -1 495.1 prior to the 1987 sampling period. Characteristics of sample sites (1970-80) are shown in table 1. Standardized rotenone field procedures I can be reviewed in more detail in TVA (1983b). i h

i Data Analyses Standing stocks of each species were calculated by size class.

Fish were grouped into game, commercial, and prey species and classified as young, intermediate and adults, based on total length. Table 4 shows the length increments used to determine size classes of fish collected.

Standing stocks of young, intermediate, and adult size classes of im-portant species were analyzed using a linear regression model to deter-mine statistically significant trends over the period 1970 through 1988.

Important species were determined by using the following criteria:

1. must occur in at least 50 percent of samples since 1970; and

2. must comprise one percent of either the total number or total biomass collected.

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In addition to species meeting the above criteria, certain species of special interest were included for analysis because of their import-ance as a sport or conmercial species.

Results and Discussion ll In 1988, thirty-eight species representing 11 families were ]

collected in cove rotenone samples in Chickamauga Reservoir (table 2). j The, species collected in 1988 had occurred in previous samples from 1970 I through 1987 (table 3). Table 5 shows the mean number and weight (kg) j 1

!: per. hectare of all species collected for the five sample areas in 1988.

'The most abundant species was threadfin shad (37.84 percent),

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followed by redear sunfish (25.95 percent), gizzard shad (14.60 percent),

and bluegill (13.75 percent) (table 6). A comparison with table 7 also shows these species to be important from 1970-87.

During 1988, gizzard shad comprised 48.57 percent of the total-biomass sampled, whereas biomass of threadfin shad, bluegill, and rodear sunfish were 12.85 percent, 9.61 percent, and 6.90 percent, respectively. Freshwater drum, channel catfish, and largemouth bass comprised 4.50 percent, 3.12 percent, and 2.79 percent of the biomass (table 6). However, these three species comprised only 0.29, 0.08, and

, 0.44 percent of the total number of fish sampled. A comparison of these data with samples collected prior to 1988 (table 7) shows a similarity in biomass among years for gizzard shad, bluegill, channel catfish, and largemouth bass. Threadfin shad and redear show an increase in biomass in this sample, while freshwater drum shows a decrease.

Total standing stock of fish in Chickamauga Reservoir in 1988 was 57,650 fish /ha with a biomass of 337.0 kg/ha (table 8). The sampling in i

1988 yielded the highest total number of fish since 1970. This increase was due to an increase in the number of young-of-year fish collected.

In the 1988 sample, young-of-year fish represented 95.6 percent of the total number of fish and 32.4 percent of the biomass (table 9). 1 Gamefish made up 41.9 percent of the young-of-year fish by number and were primarily redear. sunfish, bluegill, and warmouth. These three species comprised approximately 7.5 percent of the total population biomass in 1988 and have been important species in collections made from 1970-87 (table 7).

Forage fish umde up 53.4 percent of the young-of-year fish by number in 1988 (table 9), and were primarily gizzard and threadfin shad.

The young-of-year of these two species comprised approximately 51 percent of the total fish population by number and approximately 21 percent of the total population biomass. Combining all size classes, forage species dominated with 54.9 percent of total number and 64.4 percent (216.94 kg/ha) of total biomass. Game and commercial fish comprised 24.1 percent (81.21 kg/ha) and.11.5 percent (38.81 kg/ha) of the total biomass, respectively.

Intermediate and harvestable size fish comprised 2.1 percent and 2.3 percent of the population by number and 7.0 percent and 60.6 percent by weight, respectively (table 9). The intermediate sized fish of all species continues to make up a small portion of the total fish popula-tion. This fact was also evident in samples collected prior to 1988 (table 8).

Gamefish increased in number and biomass from 1970 to a high point in 1981. In 1982 through 1984, levels similar to the late 1970s were observed (table 10). There has been a slight increase in the number

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i and biomass of gamefish since 1985. A review of the data since 1970

_ i indicates gamefish numbers in 1988 have been exceeded only in 1980, 1981, '

and 1983, and biomass have only been exceeded in 1981. These increases coincide with the increase of aquatic macrophyte colonies on Chickamauga Reservoir.

A review of the data in table 10 shows fluctuations in the total numbers and biomass with a generally decreasing trend in biomass since the 1970s. The total biomass of commercial (rough) fish in 1988 was the lowest recorded during the 1970-88 sample period (table 10). The standing stock of commercial fish observed in 1988 has been exceeded in 13 of the 18 years sampled.

Forage fish number and biomass have fluctuated since 1970 with the highest number of fish per hectare occurring in 1988 (table 10).

This increase was due to the large number of young-of-year threadfin shad collected. The forage fish biomass has shown a slight decreasing trend since 1985; however, the biomass in 1988 exceeded the biomass for samples from 1970 to 1982.

Important Species Eighteen species have been classified as important or of special interest from the cove rotenone sampling (table 11). Linear regression analyses indicating trends in numerical abundance and biomass of all size classes of those species through time are discussed below. The trends analyses cover the sampling period from 1970 and may not accurately reflect recent population trends.

Gizzard Shad--From 1970 through 1988 no statistically significant trends were indicated for numbers or biomass. However, adult gizzard

shad biomass was highest in 1984 and has shown a gradual decline through 1988 (tsble 12). Number and biomass of young-of-year continues to show a significant upward trend from 1970 (table 11). The standing stock of gizzard shad for 1988 has been exceeded three times in previous years.

This high number is the result of the increased number of young-of-year offsetting the slight decline of adult shad.

Threadfin Shad-Over the period 1970 through 1988, numbers i- j and biomass of young-of-year threadfin shad have shown wide variation.

Extremely cold winters in 1971-78, 1978-79, 1983-84, and 1985-86 apparently contributed to declines in the population observed during !

) these periods. Threadfin shad frequently experience extensive winter ,

kill during severely cold weather. l I'

Tuere was an abrupt increase in biomass in 1985 (92.21 kg/ha) which was followed by a decline in 1986 (8.64 kg/ha) (table 13).

(Increased open water habitat in 1985 resulted from an experimental j summer drawdown of Chickamauga approximately one month before cove areas were sampled.) Although other environmental / compensatory mechanisms may have influenced the dramatic increase in 1985, this increased open water along the shoreline and coves in 1985 likely contributed to the record high stock estimate of this species. Houser and Bryant (1968) stated that in the absence of aquatic weeds, cove standing stocks of threadfin shad were equal to open water stocks in two Arkansas reservoirs. The strong resurgence of aquatic weeds in 1986 apparently restricted threadfin shad from reservoir cove areas.

Coves on Chickamauga have been sprayed at least once each year for weed control prior to the rotenone surveys since 1982. Beginning in 1985, coves were sprayed twice each year because a single spraying did

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not always result in adequate weed control. This procedure was notably more successful in eliminating weeds in 1985 and 1987 than in 1986.

A marked increase in numbet (21,816/hai and biomass (43.31 kg/ha) in 1988 is attributed to a mild winter the previous year in which the

'threadfin did not experience extensive winter kill. Sampling in 1989 should help determine the trend of this population.

There has been a marked absence of adult threadfin shad in the -]

I samples since 1975. While this absence may be actual, it could also j be a result of the present size classification used. Threadfin shad ,

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are presently classed as young-of-year if they fall within a size range I l of 1 to 125 mm in total lenSth. This grouping may include threadfin shad which are actually adults. Care will be taken during the 1989 sampling te determine whether there are year class differences within the 1

young-of-year classification.

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carp--Young-of-year carp have shown a statistically significant increase in numbers in Chickamauga Reservoir since 1970, but no

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significant trend was observed for biomass (table 11). However, cove rotenone sampling does not provide a representative sample for the smaller size classes of carp, and such statistical trends are questionable. There was a statistically significant decrease in the number and biomass of adult carp. No trend was observed for the intermediate size group. The decreasing trend indicated for adult carp in number and biomass should continue to be monitored.

Bullhead Minnow--Bullhead minnow occurrence prior to 1971 was sporadic, but this observation may have been due to misidentification of this species. Results of linear regression analyses show that num-bers of bullhead minnows have exhibited a statistically significant

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increase (table 11). Although the analyses shows an overall increase since 1970, a marked decrease in number and biomass has occurred since 1985 (table 15). In 1985 and 1986 (TVA, 1986a; 1987), this species comprised 2.44 percent and 0.71 percent, respectively, of the total i number of fish in cove rotenone samples. In 1987, thit figure drreped to 0.10 percent (TVA, 1988) and in 1988 was 0.17 percent (table 6). A review of table 15 indicates wide fluctuations in the population since ;

1971.

Bluerill--The estimated total biomass for this species has been in the range of 20-40 kg/ha for 13 of the 18 years since 1970 l (table 16). Numbers and biomass of young-of-year have shown a statis-tically significant upward trend since 1970 (table 11). There was a l

drop in young-of-year numbers (7,156/ha) and biomass (8.74 kg/ha) for 1988 as compared to previous years. However, the total biomass in 1988 was similar to previous years. The effect of the aquatic macrophyte colonies on increased bluegill reproduction is an important factor to l.

consider. This species should be monitored for changes in future sampling.

l Lontear Sunfish--No young-of-year or harvestable longear sunfish l

were collected in 1988 (table 17). The young-of-year may have been misidentified in the small centrarchid subsample. In previous samples since 1970 this species comprised 0.5 percent of the total biomass (table 7). No adults were collected in 1986 and relatively few in 1987.

There is also a significant trend of lower biomass of intermediate sized longear sunfish (table 11). Due to the marked decrease, this population should be monitored closely in the future to determine a definite trend for this species.

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Redear Sunfish--This species comprised more than 12 percent of the number and 3 percent of the biomass of all fish collected in 18 years of rotenone sampling (table 7). In 1988, redear sunfish comprised 26.0 percent of the total number and 6.9 percent of the total biomass (table 6). As in previous linear regression analyses, numbers and biomass of young and intermediate redear sunfish have shown a signifi-cantly increasing trend (table 11). The total number per hectare and biomass per hectare for 1988 is the second highest recorded since 1970 with only 1981 yielding a higher number and biomass. Due to the habitat and feeding preferences of this species, the increased aquatic macro-phytes in Chickamauga Reservoir would be considered a major factor explaining this increasing trend.

Smallmouth Buffalo--Over the period 1970 through 1988, both numbers and biomass of intermediate and adult size classes of this species have declined significantly (table 11). Total 4 tumbers of small-mouth buffalo did increase in 1983 and were similar to levels observed in 1971 and 1972 (table 19). However, since then there is a general downward trend evident in numbers and biomass. This species should continue to be monitored.

Spotted Sucker--Spotted sucker was not identified in rotencine samples in Chickamauga Reservoir prior to 1959. As noted in a previous report (TVA, 1982), this species may have ended an expansion phase in l

l Chickamauga about 1979. However, after total biomass increased slightly in 1985, it decreased in 1986 and again in 1987 to the lowest level since 1970 (table 20). The biomass in 1988 is similar to the low level in 1987. Biomass and numbers of young-of-year spotted sucker also show a statistically significant decreasing trend (table 11). Although adult

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spotted sucker did not display a statistically significant decreasing trend, the total number per hectare of adult spotted sucker was fifth lowest and the biomass was fourth lowest in 1988 than in any other year during the.1970-88 sampling period.

Channel Catfish--in 1986 the biomass of this species was at its lowest level since 1970 (table 21). In 1987, the total number of this species was at its lowect level since 1970. A declining trend in numbers l L

and biumass was noted for intermediate size channel catfish both during i this survey (table 11). and in previous sur'ieys (Tt'A, 1978; 1980; 1983a, 1987, and 1988). There was a marked increase in the total number (46/ha) l and biomass (10.50 kg/ha) in 1988. -This was the second highest number of; catfish collected'since 1970. This species will ne.ed. continued l.

i monitoring to determine future trends.

Flathead Catfish--Total biomass estimates for flathead catfish since 1970 have seldom exceeded 1.0 kg/ha, except for 1972, 1973 and 1974 j L (table 22). Through 1987, no significant trend for biomass or numbers of any size class of this species was determined (TVA, 1988). Results of 1 J

linear regression analyses based on rotenone sample collections show a significant declining trend in numbers of young-of-year, intermediate.

l, and adult fish, and in biomass for intermediates and adults (table 11).

Cove rotenone does not provide a representative sample for all size classes of this species and it has never been collected in large j l

I' numbers, For these reasons, definitive statements concerning the l population status of this species cannot be made at thir time. .

White Bass--Total numbers and biomass of white bass in 1987 showed a relatively large decline when compared to 1986 data but increased in I 1988 (table 23). Young-of-year and intermediate white bass, absent in ,

i i

1

I 1

1983 and 1984 samples, recovered strongly in 1985 and 1986 when biomass was higher than that observed in any other year since monitoring began.

Young-of-year numbers and biomass decreased from 1985-87, with an l l

increase being observed in 1988. Linear regression analyses indicated ;

l a decreasing trend for numbers of young-of-year fish, while numbers of intermediate size f!sh showed an increasing trend (table 11).

Intermediate size white bass numbers and biomass had increased dramatically in 1986, but showed a substantial drop in 1987 and 1988 (table 23). However, intermediate white bass have never been collected in lairge quantities during the 1970-88 sampling period with the excep-tion of the 1986 sample. A review of the data in table 23 suggests a cyclic population fluctuation which is a typical pattern for this species (Chadwick, et al., 1966). Although cove rotenone sampling is not a good indicator of the adult white bass population in a reservoir, it does provide data on young-of-year when there has been good reproduction.

l This species should continue to be monitored to determine future trends.

Yellow Bass--All size classes of this species have shown statis-tically significant increases (both numbers and biomass) since 1970

[ (table 11). Because yellow bass did not meet criteria for important f

species in the preoperational analyses for SQN, this trend was first documented in the WBN preoperational monitoring report (TVA, 1980).

Total biomass for this species was highest (10.11 kg/ha) in 1981, and total numbers was highest (232.81/ha) in 1982 (table 24). During rotenone monitoring (1970-87), significant differences were noted between upper and middle areas of the reservoir, with the upper area supporting greater numbers (TVA 1988).

J

Warmouth--Warmouth did not meet criteria for "important species" status when analyses were made on the SQN preoperational studies (TVA 1978b). Subsequent data analyses for the WBN preaperational report l

(1970-79) showed warmouth abundance had increastid to meet these cri- j i

teria. Linear regression analyses show that numbers and biomass for all size groups of this species exhibited a significant increasing trend from 1

1970 through 1988 (table 11). Number and biomass (down in 1985) j increased in 1986, 1987, and 1988, and for eight of the past nine years total numbers have exceeded 1,000/ha (table 25). The increasing aquatic macrophyte colonies on Chickamauga Reservoir provide excellent habitat for warmouth and wculd probably explain the increase in numbers and biomass.

White Crappie--No adult white crappie were collected in cove rotenone samples in 1987 and 1988 (table 26). A declining trend in 1

numbers and biomass of adults had been previously reported (TVA, 1978b l

and 1988), and that trend continued through 1988 (table 11). Biomats of the intermediate size class also continued to show a decreasing trend through 1988. Statistically significant long-term increases were j detected for numbers and biomass of young white crappia. Young-of-year I

white crappie increased dram *.tically in 1987 to much higher levels than per.viously seen but dropped in 1988 (table 20). Crappie populations are ncted for cyclic fluctuations and this is evident in a review of table 26. Numbers of black crappie have increased and were more numerous than white crappie in 1988 (table 5).

Generally when both species of crappie occur, one will dominate (Goodson, 1966). Black crappie generally predominate in clear waters and are more dependent on aquatic plants and other cover than white crappio l

l (Goodson, 1966). The increased aquatic macrophyte communities and clear vater resulting from drought conditions could account for the increase in black crappie, and this may contribute to a future decrease in the population of white crappie. Both populations should be monitored for i

future trends.

Sauter--No sauger were collected in Chickamauga Reservoir cove rotenone samples from 1980 through 1984, or in 1987 and 1988 (table 27). j Cove rotenone sampling is not a reliable method to determine sauger i populations; therefore no determination can be mads concerning trends based on the few individuals collected.

I Yellow perch--This species apparently became established in Chickamauga Reservoir some time after 1959. Young yellow perch first appeared in cove rotenone samples in 1970. All size classes (both nunbers and biomast, have shown a statistically significant increase with I

the exception of biomass for t;.e intermediate size group which did not l demonstrate a significant trend (table 11). This species has become established in Chickamauga Reservoir and the population is expanding.

This species produces a semibuoyant egg mass which is woven around and among the vegetation (Goodson, 1966). The incraase of aquatic macrophytes for spawning habitat could explain the increases observed for this species.

Freshwater Drum--Linear regression analyses (1970 through 1988) revealed that both numbers and biomass of young and intermediate size freahwater drum have declined in samples (table 11). However, there was no statistical trend determined for adults. Mean annual numbers and biomass show a possible cyclic pattern for young-of-year and intermediate size groups (table 29). Numbers of young-of-year wero highest in the I

early to mid-1970s, decreased through the late 1970s and early 1980s, and subsequently increased through 1985 with a decrease from the 1985 high in 1986, 1987, and 1988. Intermediate numbers followed a similar cycle with a decrease in 1986 followed by an increase in 1987-88. Total numbers (all sizes combined) of freshwater drum in 1986 were the lowest observed l'

since 1970. Total numbers showed an increase in 1987 followed by a decrease in 1988.

l ;

A study conducted in 19b6 indicated that in spite of decreasing trends of young-of-year and intermediate stocks of freshwater drum as indicated in cove rotenone results tne population of adult freshwater j l drum appears to' be above normal in te.rms of age class composition and rate of growth (IVA, 1987).

l Lartemouth Bass--This species had occurred in 98.9 percent of all

, rotenone samples from 1970 through 1987 and made up over one percent of l

the number and three percent of the biomass of all fish collected during this period . cable 7). A significant increasing trend in biomass of young-of-year and numbers of intermediates was documented from 1984 I

through 1988 (TVA, 1988). This trend continued in 1988 (table 11).

A significant increasing trend for numbers and blomssa of adults was documented through 1985 (TVA, 1986), but this trend was not evident through 1987 (TVA 1988). Analyses of data in 1988 also failed to statistically validate this trend. Total biomass increased from 5.28 kg/ha in 1986 (the lowest for the entire sample period), to 11.64 kg/ha in 1987 and 9.40 kg/ha in 1988 (table 30).

Abundance of all size classes of largemouth bass may be directly related to increases in available forage and the increased aquatic macrophyte coverage. In 1986, deteriorating water quality in backwater

V cove areas due to drought conditions may have contributed to reduced i

largemouth bass stocks in coves; however, these stocks appeared to have recovered in 1987 and 1988.

Summary Changes and trends have been noted among t'ne various fish species l I

ranked dominant and/or important in Chic",camauga Reservoir, but total fish i i

! biomass has remained relatively stable. Some species (e.g., smallmouth buffalo, freshwater drum, flathead catfish, sauger, spotted sucker, white. ;

bass, s,nd white crappie) test have shown decreases in numbers and/or l biomass for one or more size classes are those for which cove rotenone '

l sampling often does not provide a representative sample and, therefore, trends based on cove rotenone data may be spurious. However, young-of-year data from cove rotenone for white bass and whit'e crappie can be I. considered useful. . Conversely, species that have shown increasing trends

, (e.g., bluegill, redear sunfish, warmouth, yellow perch, gizzard shad, and largemouth bass; are those for which cove rotenono provides better estimates of relative abundances, and trends based on such data are 1

more likely to be accurate. Cove rotenone data can also be useful to a degree in evaluation of channel catfish, threadfin shad, bullhead minnow, and yellow bass populations because representative samples can often be obtained.

' he overriding influence on standing stock estimates for many of the important fish species in Chickamauga Reservoir appears to be effects of habitat alteration, specifically the sevenfold increase in area occupied by aquatic vegetation since 1976. This has resulted in higher standing stock estimates for various centrarchids, particularly

warmouth, redear sunfish, bluegill, and largemouth bass. Whether aquatic vegetation has resulted in a decrease in biomass or numbers of some fish species (e.g., threadfin shad, carp, smallmouth buffalo, spotted sue *ter, j White crappie, longear sunfish, and freshwater drum) is not clear. The experimental summer drawdown of Chickamauga Reservoir in 1985 produced conditions that support previous assumptions regarding avoidance of densely vegetated coves by freshwater drum and threadfin shad. This premise was further supported in 1986 with the return of aquatic macrophytes in cove areas and corresponding decreases of freshwater drum and threadfin shad standing stocks in cove rotenone surveys. The con-tinuous drought conditions and establishment of aquatic macrophytes tend to explain the decrease in adult and intermediate white crappie and increase in black crappie young-o year. Continued monitoring will be necessary to determine long-term changes.

CONCLUSIONS AND RECOMMENDATIONS l

Based on cove rotenone sampling from 1970 through 1988, total fish biomass in Chickamauga Reservoir ham; remained relatively stable.

l

( Although changes in species abundance have been documented, most of these appear related to aquatic macrophyte increases and drought-induced conditions rather than operation of SQN and construction of WBN.

Continued fish sampling using rotenone in coves should continue as presently being conducted, with one exception. Sampling should be modified at the uppermost cove in Chickamauga Reservoir (Sewee Creek, TRM 524.6). It is questionable that data from this present location is representative of the reservoir fish population because the sample area l

s l

is entirely within the drawdown zone of Chickamauga Reservoir precluding establishment of a resident fish community. An alternate site which 1 l

'is supportive of a resident community in this general area is not avail- l

)

able. Therefore, since it is not possible to drop the present site, the sampling procedures should be modified to increase the sampling effectiveness. A block-off net should be used in the upper end to remove l the extremely shallow drawdown zone from the sample area. The deep water l

block-off net should be moved closer to the mouth of the cove to maintain a one-ac e sampling area. This modification is recommended if this site is to be used in the future.

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REFERENCES I Chadwick, Herald K., Charles E. von Geldern, Jr., and Michael L. Johnson, 1966. White Bass. Inland Fisheries Management California Resource Agency. Department of Game and Fish, pp. 412-422.

Coots, Milland, 1966. Yellow Perch. Inland Fisheries Management.

California Resource Agency, Department of Game and Fish, I

pp. 426-430.

I- 1 Goodson, Lee E., 1966. Crappie. Inland Fisheries Management. l

} California Resource Agency, Department of Game and Fish,

) pp. 312-332. j Houser, A., and H. Bryant. 1968. Sampling Reservoir Fish Populations Using Midwater Trawls, pp. 391-404. Reservoir Fishery Resource Symposium, Athens, Georgia, April 5-7, 1967.

( Tennessee Valley Authority. 1978. "Preoperational Fisheries Report ,

J for the Sequoyah Nuclear Plant." Norris, Tennessee: Division of Forestry, Fisheries and Wildlife Development, Fisheries and Waterfowl Resources Branch.

Tennessee Valley Authority. 1980. " Watts Bar Nuclear Plant Preopern-tional Fisheries Monitoring Report, 1977-79." Norris, Tennessee:

Division of Water Resources. Fisheries and Aquatic Ecology Branch.

Tennessee Valley Authority. 1982. " Aquatic Environmental Conditions in Chickamauga Reservoir During Operation of Sequoyah Nuclear Plant,

.First Annual Report (1980 and 1981)." Knoxville, Tennessee: Divi-sion of Water Resources. TVA/ONR/WRF-82/4(a).

l Tennessee Valley Authority. 1983a. " Aquatic Environmental Conditions I in Chickamauga Reservoir During Operation of Sequoyah Nuclear Plant, Second Annual Report (1982)." Knoxville, Tennessee: Division of Air and Water Resources. TVA/ONR/WRF-83/12(a)

Tennessee Valley Authority. 1983b. " Field Operations Biological Re-sources Procedures Manual." Fisheries Sampling and Field Analysis.

Quality Assurance Procedure Number S&F OPS-FO-BR-23.7 Revision 1.

Division of Services and Field Operations.

Tennessee Valley Authority. 1984. " Aquatic Environmental Conditions in Chickamauga Reservoir During Operation of Sequoyah Nuclear Plant.

Third Annual Report (1983)." Knoxville, Tennessee: Division of Air and Water Resources. TVA/ONR/WRF-84/5(a).

Tennessee Valley Authority. 1985. " Aquatic Environmental Conditions in Chickamauga Reservoir During Operation of Sequoyah Nuclear

} Plant, Fourth Annual Report (1984)." Knoxville, Tennessee:

l Division of Air and Water Resources. TVA/ONRED/WRF-85/1(b).

Tennessee Valley Authority. 1986a. " Aquatic Environmental Conditions in Chickamauga Reservoir During Operation of Sequoyah Nuclear Plant, Fifth Annual Report (1985)." Knoxville, Tennessee: Division of Air and Water Resources. TVA/0NRED/WRF-86/1(b).

Tonnessee Valley Authority. 1986b. "Preoperational Assessment or' Water Quality and Biological Resources of Chickamauga Reservoir, Watts Bar Nuclear Plant, 1973-85." Knoxville, Tennessee; Division of Air and Water Resources. TVA/0NRED/WRF-87/1(a).

Tennessee Valley Authority. 1987. " Aquatic Environmental Conditions in Chickamauga Reservoir During Operation of Sequoyah Nuclear Plant, Sixth Annual Report (1986)." Knoxville, Tennessee: Division of Air and Water Resources. TVA/0NRED/WRF-87/7.

Tennessee Valley Authority. 1988. "Chickamauga Reservoir 1987 Fisheries Monitoring, Cove Rotenone Results." Chattanooga, Tennessee:

Division of Service and Field Operations. TVA/0NRSD/WRF-88.

I I

I I - _

TABLES .

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e

Table 1. ' Characteristics of Rotenone Sites in Chickamauga Reservoir, 1970 Through 1988 (Chickamauga Dam Located at TRM 471.0, Sequoyah Nuclear Plant at TRM 484.5, and Watts Bar Nuclear Plant located at TRM 528.0)

Surface Tennessee Area Mean ' Maximum tempera-River mile Date (hectares) depth (m) depth (m) ture.(*C) 475.2 08/03/70 0.90 1.5 3.2 29.5 475.5 08/04/70 0.89 1.8 -

29.4 475.5. 09/14/71 1.26 2.0 -

25.5 475.7 09/19/72 1.26 2.0 - -

475.7 09/18/73 1.26 -

.6.4 24.8 475.7 09/16/74 1.26 2.0 4.6 25.0 475.7 09/16/75 1.33 2.0 6.1 23.5 475.7 09/14/76 0.93 1.9 4.9 23.5

.476.2 09/01/77 0.49 1.1 1.9 28.1 476.2 08/22/78 0.29 0.7 1.5 28.5' 476.2 08/21/79 0.74 1.2 2.8 28.5 476.2 08/19/80 0.65 0.7 2.2 30.0

476.2 09/01/81 0.75 1.1 2.8 27.5 476.2 08/31/82 0.42 0.8 1.4 27.5 476.2~ 08/30/83 0.42 0.8 1.8 29.5 476.2 08/27/84 0.42 0.7 1.5 26.8 476.2 08/?7/85 0.42 0.8 1.5 26.5 476.2 08/2o/86 0.40 0.6 1.5 30.4 476.2 08. ~ /87 0.40 0.8 1.5 30.0 476.2 08/23/88 0.50 1.1 2.1 30.2 47'.0 08/05/70 0.45 1.7 -

28.6 4' s.0 09/16/71 0.97 0.5 -

26.7 478.0 09/21/72 0.97 0.5 -

28.5 478.0 09/20/73 0.97 -

4.0 23.7 478.0 09/18/74 0.97 0.5 1.8 25.0 578.0 09/18/75 0.97 1.4 4.3 23.6 478.0 09/16/76 0.56 1.2 2.4 23.0 478.0 08/30/77 0.35 1.0 2.2 27.0 478.0 08/24/78' O.58 0.9 2.2 30.0 478.0 08/23/79 0.43 1.2 2.5 28.5 l 478.0 08/21/80 0.65 1.3 2.9 31.0 478.0 09/03/81 0.61 1.3 2.8 27.5 479.0 09/02/82 0.43 1.0 2.3 28.0 478.0 09/01/83 0.44 1.0 2.6 28.5 478.0 08/29/84 0.44 1.1 2.5 28.0 478.0 08/29/85 0.45 1.0 2.4 28.5 l- 478.0 08/28/86 0.45 0.8 1.9 28.6

) 478.0 08/13/87 0.40 1.2 2.2 29.8 478.0 08/25/88 0.40 1.3 2.8 29.4

) 484.7 07/06/70 0.49 1.6 -

26.0 l 495.0 07/10/70 0.61 1.2 - -

495.0 09/23/71 0.93 1.4 -

24.4 495.0 09/28/72 0.93 1.4 - -

p

Table 1. (Continued) '

Surface

. Tennessee- Area Mean Maximum tempera-River mile. Date (hectares) depth (m) depth (m) ture (*C) 1 j

1 495.0 09/27/73 0.93 -

4.0 24.6

' l 495.0 09/23/74 0.93 1.4 3.7 22.0 495.0 -09/23/75 0.93 1.4 3.7 22.8 ;

495.0 09/21/76 0.47 1.2 3.7 22.2 !

495.0 09/13/77 0.39 1.8 5.2 23.4 495.0 08/31/78 0.46 1.3 3.4 29.7 i 495.0 -09/05/79 0.52 1.4 3.7 27.5 495.0 09/26/80 0.58 1.6 3.7 30.0 1 495.0 08/20/81 0.46 1.2 3 '.1 24.0 -

495.0 08/19/82 0.46 1.4 3.4 29.0 495.0 08/18/83 0.41 1.2 3.1 28.5 495.0 08/16/84 0.41 1.4 3.2 27.0 495.0 08/22/85 0.44 1.1 3.1 29.0 495.0 09/09/86 0.44 1.1 3.0 25.7 495.1 08/27/87 0.40 0.7 1.5 28.7 405.1 08/11/88 0.40 1.0 1.9 28.3 l 1.2** 07/27/70 0.55 1.2 3.4 25.3 2.5** 07/28/70 0.96 1.3 -

29.8 3.5** 07/29/70 0.69 1.2 2.5 30.7 505.4 07/14/70 0.18 - 1.3 -

27.5 506.0 07/13/70 0.28 1.1 -

28.0 507.3 07/14/70 0.27 1.0 2.1 27.3 508.0 09/20/71 0.43 0.9 -

23.9 I 508.0 09/27/72 0.43 - - -

508.0 09/25/73 0.43 -

2.0 24.9 508.0 09/25/74 0.43 0.9 3.1 21.0 508.0 09/25/75 0.42 0.9 3.1 22.3 508.0 09/23/76 0.43 0.9 2.0 22.2 508.0 09/15/77 0.43 0.9 2.2 23.3 I

508.0 08/29/78 0.57 1.0 1.8 30.5 508.0 08/23/79 0.43 0.9 1.9 27.3 508.0 08/28/80 0.51 0.9 1.7 30.0 l 508.0 08/18/81 0.48 1.0 1.9 27.0

) 508.0 08/17/82 0.46 0.9 1.8 27.0 508.0 08/16/83 0.40 0.8 1.2 29.0 508.0 08/13/84 0.42 1.0 1.8 28.5 508.0 08/20/85 0.44 0.8 1.7 30.0 508.0 08/12/86 0.44 0.7 1.4 27.4 508.0 08/25/87 0.40 0.8 1.7 27.4 508.0 08/09/88 0.40 1.2 2.1 29.4 524.0 09/08/76 0.33 0.3 1.0 25.2 514.6 09/07/77 0.33 0.5 1.2 26.6 524.6 09/29/78 0.29 0.4 0.6 31.0 524.6 08/21/79 0.38 0.6 1.2 30.0 524.6 09/03/80 0.48 0.4 524.6 0.8 27.0 09/09/81 0.32 0.2 0.5 -

Tabl 1. (Continued)

Surface Tennessee Area Hean Maximum tempera-River mile Date (hectares) depth (m) depth (m) ture (*C) 524.6 09/08/82 0.44 0.4 0.9 26.5 524.6 09/08/83 0.43 0.4 0.8 26.5 524.6 09/04/84 0.45 0.5 1.0 23.0 524.6 09/05/85 0.47 0.4 0.8 30.0 524.6 09/11/86 0.45 0.4 0.8 26.5 524.6 09/03/87 0.40 0.4 0.8 27.0 l 524.6 09/01/88 0.50 0.7 1.2 27.5

- Hiwassee River mile (confluence at TRM 500.0) l l

, 4

_ - - - _ - - - - - _ _ - - - - - _ 1

Table 2. Common and Scientific Names of Fish in Rotenone Samples Chickamauga Reservoir, 1988 Common Name Scientific Name CAME-White bass Morone chrysops Yellow bass Morone mississippiensis Warmouth Lepomis nulosus Redbreast sunfish Lepomis auritus Green sunfish Lepomis cyane11us Bluegill Lepomis macrochirus Longear sunfish Lepomis megalotis Redear sunfish Lepomis microlophus Spotted bass Micropterus punctulatus Largemouth bass Micropterus salmoides White crappie. Pomoxis annularis Black crappie Pomoxis nigromaculatus Yellow perch perca flavescens ROUGH Spotted gar Lepisosteus oculatus Longnose gar Lepisosteus osseus Shortnose gar Lepisosteus platostomus !

Carp . Cyprinus carpio River carpsucker- Carpiodes carpio

-Smallmouth buffalo Ictiobus bubalus Spotted sucker Minytrema melanops Yellow bullhead Ictalurus natalis Brown bullhead Ictalurus nebulosus Channel catfish Ictalurus punctatus Identified bullhead Identified bullhead Flathead catfish Pylodictis olivaris Freshwater drum Aplodinotus grunniens I

FORAGE Gizzard shad Dorosoma cepedianum Threadfin shad Dorosoma petenense Central stoneroller Campostoma anomalum Golden shiner Notemigonus crysoleucas Emerald shiner Notropis atherinoides Ghost shiner Notropis buchanani Spotfin shiner Notropis spilopterus j Steelcolor. shiner Notropis whipplei l Bluntnose minnow Pimephales notatus Bullhead minnow Pimephales vigilax Mosquitofish Cambusia aftinis Logperch Percina caprodes Brook silverside Labidesthes sicculus

Table 3. List of Fish Species Collected in Cove Rotenone Samples During Preoperational ...d Operational Fisheries Monitoring for Sequoyah Nuclear Plant, Chickamauga Reservoir, 1970-1988 l

Species Common Name Fish Group Icthyomyzon castaneus Chestnut lamprey Commercial Polyodon spathula Paddlefish Commercial j Lepisosteus oculatus Spotted gar Commercial Lepisosteus osseus Longnose gar Commercial Lepisosteus platostomus Shortnose gar Commercial Alosa chry;ochloris Skipjack herring Commercial ;

Dorosoma cepedianum Gizzard shad Forage Dorosoma vetenense Threadfin sh d Forage Dorosoma sp. Unidentified shad Forage Mixed Dorosoma spp. Mixed shad Forage Hiodon ternisus Mooneye Commercial Campostoma anomalum Stoneroller Forage !

Carassius auritus Goldfish Forage Cyprinus carpio Carp Commercial Hybovsis storeriana Silver shub Forage Notemigonus crysoleucas Golden shiner Forage Notropis atherinoides Emerald shiner Forage Notropis buchanani Ghost shiner Forage Notropis chrysocephalus Striped shiner Forage Notropig cornutus Common shiner Forage Notropis emiliae Pugnose minnow Forage Notropis galacturus Whitetail shiner Forage Eotropis spilopterus Spotfin shiner Forage Notropis volucellus Mimic shiner Forage Notropis whipplei Steelcolor shiner Forage Notropie sp. Unidentified shiner Forage Pimenhales notatus Bluntnose minnow Forage Pimephales vigilax Bullhead minnow Forage Pinephales promelas Flathead minnow Forage Pimephalas sp. Unidentified minnow Forage Cyprinidae Mixed & unidentified minnows Forage Cyprinidae Minnow, carp Forage Carpiodes carpio River carpsucker Commercial Carpiodes cyprinus Quillback carpsucker Commercial Carpiodes sp. Unidentified carpsucker Commercial Catostomus commersoni White sucker Commercial Hypentelium nigricans Northern hogsucker Commercial Ictiobus bubalus Smallmouth buffalo Commercial Ictiobus cyprinellus Bigmouth buffalo Commercial Ictiobus niger Black buffalo Commercial Ictiobus sp. Unidentified buffalo Commercial Minytrema melanops spotted sucker Commercial Moxostoma carinatum River redhorse Commercial Moxostoma duquesnei Black redhorse Commercial Moxostoma erythrurum Golden redhorse Moxostoma macrolepidotum Commercial Shorthead redhorse Commercial

)

Table 3. (Continued)

I I

Species Common Name Fish Group '

Moxostoma sp. Unidentified redhorse Commercial Ictalurus furcatus Blue catfish Commercial Ictalurus melas Black bullhead Commercial Ictalurus natalis Yellow bullhead Commercial Ictalurus nebulosus Brown bullhead Commercial Ictalurus punctatus Channel catfish Commercial Pylodictis olivaris Flathead catfish Commercial Fundulus notatus Blackstripe topminnow Forage Fundulus olivaceus Blackspotted topminnow Forage Cyprinodontidae Killifish Forage Gambusia affinis Mosquitofish Forage Labidesthes sicculus Brook silverside Forage Morone chrysops White bass Game Morone mississippiensis Yellow bass Game Morone sp. Unidentified temperature bass Game Ambloplites rupestris Rock bass Game Lepomis auritus Redbreast sunfish Game Lepomis cyane11us Green sunfish Game Lepomis Kulosus Warmouth Game Lepomis humilis Orangespotted sunfish Forage Lepomis macrochirus Bluegill Game Lepomis megalotis Longear sunfish Game Lepomis microlophus Redear sunfish Game Lepomis sp. Hybrid sunfish Game Lepomis sp. Unidentified sunfish Game Micropterus dolomieul Smallmouth bass Game Micropterus punctulatus Spotted bass Game Micropterus salmoides Largemouth bass Game Pomoxis annularis White crappie Game Pomoxis nigromaculatus Black crappie Game Etheostoma aspriRene Mud darter Forage Etheostoma caeruleum Rainbow darter Forage Etheostoma kennicotti Stripetail darter Forage Etheostoma spectabile Orangethroat darter Forage Etheostoma sp. Unidentified darter Forage Percidae Unidentified darter Forage Perca flavescens Yellow perch Game Percina caprodes Logperch Forage Stizostedion canadense Sauger Game Aplodinotus grunniens Freshwater drum Commercial

L Table 4. Size Classes (Millimeters) Used in Fish Inventories Young- Inter- Harvest-of-Year mediate able GAME.

White bass 1-150 151-200 201 and over Yellow bass 1-150 151-200 201 and over Striped bass. 1-175 176-375 376 and over i Rock bass 1-75 76-125 126 and over !

Bluegill 1-75 76-125 126 and over Other sunfish 1-75 76-125 126 and over 1, smallmouth bass 1-100 101-200 201 and over i Spotted bass 1-100 101-200 201 and over

[ Largemouth bass 1-100. 101-225 226 and over ,

)' Crappie 1-75 76-175 176 and over i Sauger 1-200 201-275 276 and over Walleye 1-200 201-275 276 and over ROUGH Lamprey 1-50 51-125 126 and over c Paddlefish 1-300 301-450 451 and over.

Car 1-300 301-475 476 and over Bowfin 1-200 201-300 301 and over Skipjack herring 1-150 151-275 276 and over Mooneye 1-150 151-300 301 and over Carp 1-200 201-300 301 and over i Goldfish 1-150 151-250 251 and over

! ' Buffalo 1-200 201-300 301 and over Carpsuckers 1-175 176-250 251 and over Redhorses 1-170 176-250 251 and over i Other suckers 1-175 176-2f,0 251 and over Blue catfish 1-125 126-025 226 and over Channel catfish 1-125 12G-225 226 and over Bu11 heads 1-100 101-175 176 and over Flatheud catfish 1-125 126-275 276 and over Freshwater drum 1-125 126-200 201 and over Grass pickerel 1-175 176-300 301 and over FORAGE Girzard shad 1-125 -

126 and over Threadfin shad 1-125 -

126 and over Orangespotted sunfish. 1-50 51-75 76 and over Miscellaneous forage fish all sizes - -

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Table 5. Mean Number and Weight (kg) of Fish per Hectare in five Samples in Chickamauga Reservoir, 1968 Youno mf-Year intermediate Harvestable Total Species Number Weight Number Weight Number Weight Number Weight GAfE White bass 29.37 0.33 5.12 0.27 1.86 0.28 36.35 0.88 Yellow bass 174.59 1.21 6.70 0.46 0.94 0.21 182.23 1.87 Warnouth 1,290.27 2.06 54.27 1.04 32.95 3.78 1,377.50 6.88 Hedbreast sunfish 211.03 0.26 28.09 0.55 21.51 1.62 260.62 2.42 Green sunfish 24.55 0.06 5.99 0.09 0.43 0.03 30.97 0.18 Bluegill 7,156.58 8.74 594.94 8.57 176.41 15.07 7,927.94 32.37 Longerar sunfish - - 5.22 0.08 - -

5.22 0.08 Rodear sunfish 14,650.57 14.41 243.39 4.46 64.02 4.36 14,957.98 23.24 Spotted bass 87.84 0.35 2.71 0.07 - -

90.56 0.40 Largemouth bass 158.10 0.76 72.88 2.54 22.52 6.10 253.50 9.40 White crapple 86.11 0.18 13.35 0.13 - - 99.46 0.31 Black crapple 131.13 0.30 13.01 0.16 0.19 0.10 145.04 0.56 Yellow perch 178.87 0.47 78.24 0.45 42.46 1.71 299.57 2.63 Group total 24,179.01 29.11 1,123.91 18.85 364.01 33.26 25,666.93 81.21 ROUGH l

Spotted gar 3.48 0.17 f.33 0.19 - -

4.81 0.36 i Longnose gar 3.75 0.06 1.40 0.13 - -

5.15 0.18 Shortnose gar - - - -

0.37 0.49 0.37 0.49 Carp I.86 0.04 2.17 5.82 4.03 5.86 River corpsucker 1.77 0.05 - -

0.37 1.01 2.14 1.07 l Smallmouth buffalo - - - - 1.21 f.77 1.21 1.77 l Spotted sucker 0,48 T 0.95 0.12 5.56 2.67 6.98 2.79 Yellow bullhead 52.89 0.22 1.86 0.05 0.93 0.12 55.68 0.40 Brown bullhead 22.46 0.07 2.67 0.05 0.43 0.11 25.56 0.23 ,

Channel catfish 1.85 0.01 9.62 0.39 35.04 10.10 46.51 10.50 Unidentified bullhead 8.37 0.01 - - - -

8.37 0.01 Flathead catfish 0.47 T - - - -

0.47 T Freshwater drum 2.75 0.05 72.00 3.82 89.67 11.29 164.42 15.16 Group total 100.12 0.70 89.83 4.74 135.75 33.38 325.70 38.81 FORAGE Girzard shad 7,564.02 26.24 - -

850.02 137.41 8,414.04 163.65 Threadfin shad 21,816.41 43.51 - - - -

21,816.41 43.31 Central stoneroller 1.85 0.01 - - - -

1.85 0.01 Golden shiner 714.26 8.72 - - -

714.26 8.72 Emerald shiner 10.97 0.02 - -

10.97 0.02 Ghost shiner 0.85 T - - - -

0.85 T Spotfin shiner 192.56 0.21 - - - -

192.56 0.21 Steelcolor shiner l1.30 0.02 - -

11.30 0.02 Bluntnose minnow 0.74 T - - - -

0.74 T Bullhead minnow 98.39 0.07 - -

98.39 0.07 Mosquitoffsh 29.67 0.03 - - - -

29.67 0.03 Logperch ' 60.20 0.60 - - - -

60.20 0.60 Brook silverside 306.12 0.30 - -

306.12 0.30 Group total 30,807.35 79.53 0.00 0.00 850.02 137.41 31,657.37 216.94 Final total 55,086.49 109.33 1,213.73 23.59 1,349.78 204.04 57,650.00 336.56

Table 6. Percent Species Composition of Cove Rotenone Populations Chickamauga Reservoir, 1988 1

Percent of Total Percent of Total !

Species Numbers Weight Threadfin shad 37.84 12.85 Redear sunfish 25.95 6.90 Gizzard shad 14.60 48.57 Bluegill 13.75 9.61 Warmouth 2.39 2.04 Golden shiner 1.24 2.59 Brook silverside 0.53 0.09 Yellow perch 0.52 0.78 Redbreast sunfish 0.45 0.72 Largemouth bass 0.44 2.79 Spotfin shiner 0.33 0.06 Yellow bass 0.32 0.56 Freshwater drum 0.29 4.50 Black crappie 0.25 0.17 White crappie 0.17 0.09 Bullhead minnow 0.17 0.02 Spotted bass 0.16 0.12 Logperch 0.10 0.18 Yellow bullhead 0.10 0.12 Channel catfish 0.08 3.12 White bass 0.06 0.26 Green sunfish 0.05 0.05 Mosquitofish 0.05 T Brown bullhead 0.04 0.07 Steeleolor shiner 0.02 T Emerald shiner 0.02 T Unidentified bullhead 0.01 T Spotted sucker 0.01 0.83 Longear sunfish T 0.02 Longnose gar T 0.05 Spotted gar T 0.11 Carp T 1.74 River carpsucker T 0.32 central stoneroller T T Smallmouth buffalo T 0.53 Ghost shiner T T Bluntnose minnow T T Flathead catfish T T Shortnose gar T 0.14 100.00 100.00 Note: T = less than 0.01 percent.

I=

)

' Table 7.. Listing of Important Species Collected in Rotenone Samples from Chickamauga Reservoir, 1970-1987*

l-Percent Percent Percent

>. Common Name Scientific Name Occurrence Number Biomass GAME White bass ** Morone chrysops 43.478 0.0916 0.2847 Yellow bass ** Morone mississippiensis 79.348 0.3480 0.6533 Warmouth- Lepomis nulosus 95.652 3.1504 0.6945 B1uegill Lepomis macrochirus 100.00 40 0437 9.0369 Longear sunfish Lepomis megalotis 75.000 1.4123 0.5779 Redear sunfish Lepomis microlophus. 97.826 12.0282 3.0742 Largemouth bass Micropterus salmoides 98.913 1.3385 3.0253 White crappie ** Pomoxis annularis 94.565 0.3206 0.6127 Ye110w perch ** Perea flavescens 77.174 0.2817 0.3165 Sauger** Stizostedion canadense 27.174 0.0050 0.0615 COMMERCIAL Carp Cyprinus carpio 81.522 0.0520 7.3950 Smallmouth Ictiobus bubalus 65.217 0.0502 5.4027 buffalo

' Spotted sucker Minytrema melanops 82.609 0.1268 2.1287

j. Channe, catfish Ictalurus punctatus 90.217 0.0764 3.1319 i Flathead Pylodictis olivaris 60.870 0.0137 0.1728 catfish **

Freshwater drum Aplodinotus grunniens 100.000 1.0616 7.5879 FORAGE Gizzard shad Dorosoma cepedianum 100.000 13.9590 45.6741 Threadfin shad Dorosoma getenense 93.478 17.5775 5.3247 Bu11 head minnow Pimephales vigilax 73.913 1.8227 0.1456

Based on 92 samples.

- eees of s,ee.1 interest that ed not me.t import.nt crite,i..

L i

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). '

f ?

i L

Table 8. Number of Samples and Mean Annual Standing Stock (no./ha and kg/ha) -

of all Young, Intermediate, and Harvestable Size Fish Collected in Cove Rotenone Samples from Chickamauga Reservoir, 1970-1988

'Yount of Year Intermediate Harvestable Total Year Samples Number kg Number kg Number kg Number kg 1970 12 7.353 12.61 '534 24.80 931 182.49 8.819 219.91 1971 4 7,018 17.27 724 97.95 863 168.04 8,604 283.26 1972 4 12,872 63.06 932 30.96 1,394 271.21 15,199 365.23 1973 4 13,092 72.52 955 36.44 1,572 290.20 15,619 399.16 1974 4 9,737 34'.23 673 21.98 1,263 194.91 11,673 251.13 1975 4 12,684 37.18 443 14.94 1,364 187.09 14.491 239.21 1976 5 14,662. 37.20 1,179 26.39 1.400 272.84 17,241 336.43 1977 5 33,121 96.18 1,164 26.41 1,441 223.97 35,981 346.56 1978 5 19,883 31.70 960 19.98 2,584 184.51 23,427 236.19 1979 5 17,973 22.91 1,375 27.41 2.872 209.04 22,220 259.36 1980 5 34,424 44.71 537 10.08 1,020 132.58 35,981' 187.37 1981 5 53,515 66.21 1,590 34.14 2,278 327.68 57,383 428.03

( 1982 5 33,655 56.23 977 24.37 1,919 209.92 36,551 209.52 1983 5 46',500 70.74 1,209 26.60 2,513 344.07 50,223 441.41 1984 5 24,814 43.58 937 22.47 3,545 383.25 29,296 449.30 h 1985 5 43,064 143.49 986 26.88 2,361 357.54 46,411 527.91 1986 5 33.393 63.82 962 30.37 1,832 251.51 36,188 345.70 1987 5 43,547 89.91 1,420 26.96 1,677 233.85 46,644 350.72 1988 5 55,086 109.33 1,214 23.59 1,350 204.04 57,650 336.96 l

b i

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Table 9. Percent Size Distribution of Major Fish Groups, Chickamauga fleservoir,1988 j

Young 4f- Inter- Harvest- Young-of- Inter- Harvest- l Year mediate able Total Year msdiate able Total j Percent by Number ____ Percent by idolaht 88** 41.9 1.9 0.6 ' 44.5 8.6 5.6 9.9 24.' .l 4

W 0.2 0.2 0.2 0.6 0.2 1.4 9.9 ll,5 l

Forage 53.4 0.0 1.5 54.9 23y6 0.0 40.8 64.4

):

Total 95.6 2.1 2.3 100.0 32.4 7.0 60.6 100.0 L

i l

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~ '

, _ .. .. .. . : ' - ' ' ' ' ^ ^ ~ ~ ' ~

E<

N. b Table 10. Mean Annual Standing Stock (no./ha and kg/ha) of Game, ,

[- Commercial, and Forage Fish Collected in Cove Rotenone Samples i

( from Chickamauga Reservoir, 1970-1988 h Game Fish Commercial Fish Forate Fish i-Year Number kg Number kg Number l

kE !

1970 2,288.22 27.42 548.18 109.55 5,982.24 82.93 1971 2,778.21 41.27 421.52 165.43 5,404.62 76.57 ;

1972 3,764.61 58.53 769.14 140.99 10,665.19 165.72 !

1973 4,427.42 59.13 979.55 158.12 10,212.52 181.92 1974 2,637.81 33.32 396.25 79.74 8,638.84 138.07 1975 5.489.16 37.06 269.92 76.42

' 8,731.57 123.73 !

f 1976 8,624.39 57.53 474.81 147.02 8,141.71 131.88 F 1977 22,477.22 72.79 443.34 94.65 12,805.99 179.13 1978 18.340.44 57.57 228.17 52.31 4,859.30 126.30

1979 18,590.09 69.87- 281.76 92.03 1980 3,347,66 97.46 33,026.90 80.19 225.13 66.67 2,728.00 -40.51 1981 51,074.50 116.51 504.41 131.19 5,804.83 180.33 1982 24,734.58 67.64 451.39 57.10 11.365.07 165.79 1983 33,984.29 75.73 486.75 93.60 f ~1984 15,751.63 272.05 18,575.99 60.79 359.68 42.90 10,360.50 345.60 1985 14,844.74 62.58 473.53 100.18 31,092.40 1986 365.15 21,753.26 71.53 203.90 42.07 14,230.35 232.10 1987 23.034.26 75.00 405.80 48.20 1988 23,203.70 227.50 25,666.93 81.21 325.70 38.81 31,657.37 216.94 I

I

)

ie

)

' Table 11. Results of. Linear Regression Analyses Indicating Significant t Trends of Numbers /ha and/or kg/ha by Size Group of Important i

[

Fish Species Collected in Cove Rotenone Samples from Chickamauga Reservoir, 1970-1988 l

I I~ !

Species' Group

Slope F-Value PR F** ;

Gizzard shad YNG-NO. 0.09 11.46 0.0010 ;

Gizzard shad YNG-WT. 0.05 19.09 0.0001 ;

Threadfin shad ADT-NO. -0.02 4.30 0.0408 3 Carp YNG-NO. 0.02 11.22 0.0012 Carp ADT-No. -0.02 5.56 0.0204 Carp ADT-WT. -0.03 4.36 0.0394 Bullhead minnow YNG-NO. 0.08 15.64 0.0001

. Smallmouth buffalo INT-NO. -0.03 16.97 0.0001 Smallmouth buffalo INT-WT. -0.02 13.47 0.0004 Smalla.outh buffalo ADT-NO. -0.04 17.94 0.0001 Smallmouth buffalo ADT-WT. -0.05 17.27 0.0001 Spotted sucker YNG-NO. -0.04 12.47 0.0006 Spotted sucker YNG-WT. -0.01 10.22 0.0019

> Channel catfish INT-NO. -0.04 19.60 0.0001 I Channel catfish INT-WT. -0.01 15.75 0.0001 Flathead catfish YNG-NO. -0.02 8.63 0.0041 Flathead catfish INT-NO. -0.01 10.25 0.0019 -

Flathead catfish INT-WT. -0.003 9.86 0.0023 Flathead catfish ADT-NO. -0.02 15.92 0.0001 Flathead catfish ADT-WT. -0.01 13.75 0.0004 White bass YNG-NO. -0.02 3.98 0.0489

! White bass INT-NO. 0.01 4.05 0.0469 Yellow bass YNG-NO. 0.08 28.20 0.0001 Yellow bass YNG-WT. 0.01 17.08 0.0001 Yellow bass INT-NO. 0.05 22.64 0.0001 Yellow bass INT-WT. 0.02 15.11 0.0002 Yellow bass ADT-NO. 0.03 22.07 0.0001 Yellow bass ADT-WT. 0.01 19.17 0.0001 Warmouth YNG-NO. 0.14 88.85 0.0001 Warmouth YNG-WT. 0.02 38.55 0.0001 I Warmouth INT-NO. 0.04 17.65 0.0001 f Warmouth INT-WT. 0.01 27.90 0.0001 Warmouth ADT-NO. 0.04 17.24 0.0001 Warmouth ADT-WT. 0.02 21.23 0.0001 Bluegill YNG-NO. 0.05 18.81 0.0001 Bluegill YNG-WT. 0.03 16.14 0.0001 Longear sunfish INT-WT. -0.01 6.20 0.0145 Redear sunfish YNG-NO. 0.16 91.37 0.0001 Redear sunfish YNG-WT. 0.04 49.02 0.0001 Redear sunfish INT-NO. 0.04 7.65 0.0068 Redear sunfish INT-WT. 0.02 14.66 0.0002 Largemouth bass YNG-WT. 0.01 6.60 0.0118 Largemouth bass INT-NO. 0.03 7.74 0.0065 l

Table 11. (Continued)

Species Group

Slope F-Value PR F**

)- White crappie YUG-NO. 0.03 4.05 0.0471 White crappie YNG-WT. 0.003 4.67 0.0331 White crappie INT-WT. -0.009 11.77 0.0009 White crappie ADT-NO. --0;05 26.96 0.0001 l White crappie ADT-WT. -0.02 24.13 0.0001 )

Yellow perch YNG-NO. 0.04 6.03 0.0159 1 Yellow perch YNG-WT. 0.003 3.96 0.0494 !

Yellow perch INT-NO. 0.03 5.42 0.0220 l Yellow perch ADT-NO. 0.03 7.58 0.0071 j Yellow perch- ADT-WT. 0.01 5.64 0.0195

{_ Freshwater drum YNG-NO. -0.08 38.46 0.0001 j j Freshwater drum YNG-WT. -0.01 21.20 0.0001 l Freshwater drum INT-NO. -0.04 16.61 0.0001 !

Freshwater drum INT-WT. -0.03 21.63 0.0001 ;

i

YNG-NO. = Young (numbers /ha) YNG-WT. = Young (kg/ha)

( INT-NO. = Intermediate (numbers /ha) INT-WT. = Intermediate (kg/ha)

J ADT-NO. = Adult (numbers /ha) ADT-WT. = Adult (kg/ha)

- Probability of obtaining a value SF. Only those values with a probability level of 0.05 or less are listed.

4 I

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)-

_____ _ -_ ___.___u_ __.

i

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' l U-' \

Table 12. Numbers and Biomass (kg) Per Hectare of Each Size Group of Gizzard L shad in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 Young-of-Year Intermediate

Adult Total !

Numbers Biomass Numbers Biomass Numbers Biomass Numbers ' Biomass l l

) 1970 1,129.74 2.24 0.00 0.00 645.34 75.49 1,775.08 77.73 l 1971 329.03 2.27 0.00 0.00 561.91 65.51 890.94 67.78 l

) 1972 0.52 0.01 0.00 0.00 836.35 119.52 836.87 119.53 !

) 1973 0.65 0.01 0.00 0.00 1,034.97 127.41 1.035.63 127.42 i 1974 5.23 0.07 0.00 0.00 912.33 107.61 917.56 107.69 1975 109.44 1.44 l

0.00 0.00 946.20 90.71 1,055.64 92.15- j 1976 1,140.28 9.83 0.00 0.00 844.93 105.62 1,985.21 115.45 1977. 8,624.47 44.57 0.00 0.00 928.02 112.60 9,552.49 157.17 1978 1,894.39 7.74 0.00 0.00 2,177.57 115.17 4,071.96 122.92 1979 54.15 0.68 0.00 0.00 2,315.58 92.12

~

2,369.73 92.80 1980 953.30 2.63 0.00 0.00 503.02 34.73 1,456.32 37.36 )

1981 507.50 1.73 0.00 0.00 1,484.11 164.41 1,991.61 166.14 1982 7,913.77 20.23 0.00 0.00 1,530.03 140.19 1983 1,994.09 9,443.80 161.89 9.93 0.00 0.00 1,981.22 232.46 3,975.31 242.39 1984 3,606.31 8.79 0.00 0.00 3,192.03 329.83 6,798.33 1985 3,873.29 338.63 29.29 0.00 0.00 1,898.52 239.89 5,771.81 269.18 1986 5,204.10 22.00 0.00 0.00 1,528.00 195.64 6,732.10 217.64 1987 7,808.70 32.96 0.00 0.00 1,313.05 168.40 1988 7,564.02 9.121.76 201.35 26.24 0.00 0.00 850.02 137.41 8,414.04 163.65 i

No intermediate size class considered.

l

}

~43-(

)

i 7 Table 13. Numbers and Biomass (kg) per Hectare of Each size Group l of Threadfin Shad in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 Young-of-Year Intermediate

Adult Total Numbers Biomass Numbers Biomass Numbers Biomass Numbers Biomass 1970 2,732.68 2.94 0.00 0.00 0.31 0.01 2,732.99 2.95

} 1971 3,351.72 7.19 0.00 0.00 0.00 0.00 3,351.72 7.19 l 1972 8,094.18 41.72 0.00 0.00 52.33 1.46 8,146.51 43,18 1973 7,248.00 50.51 0.00 0.00 6.21 0.20 7.254.21 50.72 1974 6.916.67 28.02 0.00 0.00 3.10 0.13 6,919,78 28.16

}

1975 3,906.97 23.05 0.00 0.00 122.96 4.07 4,029.94 27.12 1976 3,401.95 11.75 0.00 0.00 0.00 0.00 3,401.95 11.75 1977 1.566.42 17.31 0.00 0.00 0.00 0.00 1,566.42 17.31

) 1978 53.10 '0.34 0.00 0.00 0.00 0.00 53.10 0.34 1979 363.60 0.80 0.00 0.00 0.47 0.01 364.06 0.81 1980 448.09 0.79 0.00 0.00 0.00 0.00 448.09 0.79 1981 3,294.25 8.29 0.00 0.00 0.00 0.00 3,294.25 8.29 l 1982 368.97 1.00 0.00 0.00 1.43 0.03 370.40 1.03 1983 8,838.26 23.67 0.00 0.00 0.00 0.00 8,838.26 23.67 1984 866.60 2.13 0.00 0.00 0.00 0.00 866.60 2.13

! 1985 22,913.04 92.19 0.00 0.00 0.48 0.02 27.913.52 92.21 1986 4.912.88 8.64 0.00 0.00 0.00 0.00 4,912.88 8.64 1987 12,454.17 18.07 0.00 0.00 0.00 0.00 12,454.17 18.07 1988 21,816.41 43.31 0.00 0.00 0.00 0.00 21,816.41 43.31

No intermediate size class considered.

l 1

_ _ .. - -" "- ~

I F

L

!~ Table 14. Numbers and Biomass (k&; / r Hectare of Each Size Group L of Carp in Cove Rotenone Camples Chickamauga Reservoir, 1970-1988 f

)

Yount-of-Year Ints~ mediate Adult .,

Total Numbers Biomass Numbers Biomass Numbers Biomass Numbers Biomass 1970 0.84 0.00 0.15 0.06 4.77 7.04 5.77 7.09

): 1971 0.00 0.00 0.20- 0.05 27.46 53.85 27 66 53 89 1972 0.00 0.00 0.00 0.00 14.66 31.59 14.66 31.59 1973 0.00 0.00 0.00 0.00 21.49 48.42 21.49 48.42 1974 0.00 0.00- 0.52 0.09 8.28 20.18 8.79 20.27 1975 0.00 0.00 0.00 0.00 12.65 28.93 12.65 28.93 1976 0.00 0.00 0.22 0.05 22.16 46.72 22.37 46.77' 1977 0.00 0.00 0.00 0.00 .14.26 31.39 %4.26 31.39 1978 2.09 0.11 2.16 0.'31 5.21 14.43 9.46 14.86 1979 0.54 0.01 0.00 0.00 16.93 38.02 17.47 38.04 1980-. 4.21 0.13 0.31 0.04 7.98 24.01 12.49 24.18 1981 34.52 2.02 3.79 0. t . 4.04 11.94 42.35 14.57 1982 7.02 0.14 0.48 0.12 4.92 8.91 12.41 9.16 1983 -0.98 0.01 0.00 0.00 12.81 29.61 13.78 29.62 1984 1.45 0.11 0.00 0.00 1.45 3.45 2.92 3.56 1985 1.39 0.11 2.72 0.56 15.04 37.42 19.14 38.09 1986 1.34 0.07 0.44 0.06 4.91 13.54 6.70 13.67 1987 4.07 0.19 0.88 0.11 5.13 12.85 10.09 13.15 1988 1.86 0.04 0.00 0.00 2.17 5.82 4.03 5.86 y

_ _ _________.-______-..m_ _ _ _ . - . _ __ - -

i I

1 Table 15. Numbers and Biomass (kg) Per Hectare of Each Size Group of Bullhead Minnow in Cove Rotenone Samples, Chickamauga Reservoir, 1971-1988 YounR-of-Year

Intermediate Adt*1 t Total Numbers Biomass Numbers Biomass Numbers Bicmass Numbers Biomass 1971 1.05 0.00 0.00 0.00 0.00 .0.00 1.05 0.00 f 1972 72.67 0.15 0.00 0.00 0.00 0.00 72.67 0.15 l 1973 0.65 0.00 0.00 0.00 0.00 0.00 0.65 0.00 1974 734.76 0.81 0.00 0.00 0.00 0.00 734.76 0.81 1975 3,397.45 3.72 0.00 0.00 0.00 0.00 3,397.45 3.72 1976 1,974.17 1.75 0.00 0.00 0.00 0.00 1,974.17 1.75 1977 418.03 0.67 0.00 0.00 0.00 0.00 418.03 0.67 1978 148.19 0.14 0.00 0.00 0.00 0.00 140.19 0.14 1979 118.98 0.09 0.00 0.00 0.00 0.00 118.98 0.09 1980 65.01 0.09 0.00 0.00 0.00 0.00 65.01 0.09 1981 20.46 0.01 0.00 0.00 0.00 0.00 20.46 0.01 1982 554.76 0.41 0.00 0.00 0.00 0.00 554.76 0.41 1983 684.88 0.34 0.00 0.00 0.00 0.00 648.88 0.34 1984 527.09 0.44 0.00 0.00 0.00 0.00 527.09 0.44 1985 1,133.06 0.72 0.00 0.00 0.00 0.00 1,133.06 0.72 1986 257.62 0.22 0.00 0.00 0.00 0.00 257.62 0.22 1987 45.22 0.03 0.00 0.00 0.00 0.00 45.22 0.03 1988 98.39 0.07 0.00 0.00 0.00 0.00 98.39 0.07 L

All minnows grouped in young-of-year size class.

, ___m,_,.m__._ - - _ - - --- - - - ~ - _ ' " - - ~ ~ - ' - - ' - ' - ' - - - - - - - - - - " -

I

)

1 h

Table 16. Numbers and Biomass (kg) Per Hectare of Each Size Group

, of Bluegill in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 Young-of-Year . Intermediate Adult Total Numb ers Biomass Numbers Biomass Numbers Biomass Numbers Biomass 1970 1,243.26 2.46 193.31 5.27 70.03 5.28 1,506.60 13.01 1971 1,669.92 3.18 345.20 8.84 94.88 6.68 2,110.00 18.70 1972 2,296.39 10.96 495.25 9.53 171.22 11.80 2,962.87 32.30 1973 2,214.82 5.97 374.95 7.81 186.17 12.13 2,775.94 25.91 1974 1,447.34 1.77 296.85 4.90 105.55 5.68 1,849.74 12.36 1975 4,073.41 4.83 237.89 4.18 108.32 5.96 4,419.62 14.97 1976 5,812.86 6.67 674.71 10.08 186.81 11.33 6,674.38 28.09 1977 18.963.39 20.64 519.75 7.96 185.11 11.21 19,668.26 39.81

{ 1978 15,302.8i 15.89 552.57 7.87 119.50 7.06 15,974.88 30.82 953.28 1979 13,121.79 11.47 13.59 213.18 12.11 14,288.25 37.16 1980 26,776.07 27.42 257.12 4.01 231.35 16.66 27,264.54 48.08 1981 23,622.21 16.68 979.89 15.16 277.70 19.30 24,879.80 51.13 1982 13,088.58 14.52 497.85 6.96 94.39 5.91 13,680.82 27.39 1983 16.134.86 16.37 663.92 9.47 118.91 7.97 16,917.69 33.81 1984 11,698.16 18.59 412.78 6.20 136.40 9.24 12.247.35 34.03 l 1985 10,131.34 10.35 420.46 5.81 109.76 8.28 10,661.56 24.44 1986 12,644.32 13.74 329.86 4.88 120.50 10.66 13.094.68 29.28 1987 13,373.54 17.52 8?0.75 11.03 126.37 11.18 14,330.66 39.73 1988 7,156.58 8.74 594.94 8.57 176.41 15.07 7,927.94 32.37 L

t I

t f

i l Table 17 Numbers and Biomass (kg) Per Hectare of Each Size Group l of Longear Sunfish in Cove Rotenone Samples, Chickan.auga Reservoir, 1970-1988 Yount-of-Year Intermediate Adult Total Numbers Biomass Numbers Biomass Numbers Biomass Numbers Biomass 1970 47.16 0.32 24.34 0.58 2.71 0.17 74.21 1.07 1971 126.30 0.51 57.59 1.45 2.48 0.08 186.37 2.03 1972 171.57 0.63 76.93 1.46 5.84 0.51 254.34 2.60 1973 312.19 0.79 59.20 1.20 3.29 0.20 374.69 2.19 1974 321.73 0.47 73.49 1.19 3.70 0.17 398.92 1.84 1975 488.19 0.75 48.23 0.86 0.64 0.04 537.07 1.65 1976 867.52 1.46 188.92 2.84 4.73 0.23 1,061.16 4.53 1977 393.78 0.94 194.22 2.92 1.96 0.09 589.96 3.95 1978 191.00 0.28 75.90 1.18 7.42 0.33 274.31 1.79 1979 1,013.24 1.06 112.07 1.72 5.14 0.25 1,130.45 3.03 1980 324.67 0.53 35.93 0.67 8.80 0.42 369.40 1.62 1981 43.10 0.30 64.02 1.06 9.15 0.51 116.27 1.88 1982 51.26 0.20 44.42 0.75 3.59 0.20 99.27 1.15 1983 115.44 0.13 8.29 0.12 2.30 0.11 126.03 0.36 1984 737.09 1.26 42.20 0.60 2.42 0.19 781.71 2.05 1985 193.17 0.40 50.83 0.75 2.72 0.14 246.72 1.29 1986 224.35 0.37 13.64 0.18 0.00 0.00 238.00 0.55 1987 579.23 0.95 22.65 0.41 1.43 0.00 603.31 1.43 1988 0.00 0.00 5.22 0.08 0.00 0.00 5.22 0.08

i l

l Table 18. Numbers and Diomass (kg) Per Hectare of Each Size Creup of Redear Sunfish in Cove Rotenone Samplew, Chickamauga Reservoir, 1970-l')88 Young-of-Year Intermediate Adult Total Numbers Biomass Numbers Biomass Numbers Biomass Numbers Biomass 1970 9.09 0.02 15.23 0.40 16.65 1.69 40.97 2.11 1971 80.79 0.25 25.28 0.65 33.08 4.52 139.14 5.42 1972 46.02 0.26 40.65 1.14 62.42 6.90 149.09 8.30 1973 614.75 3.64 36.64 0.89 43.59 5.35 694.98 9.83 1974 66.12 0.19 62.88 1.39 61.86 6.80 190.86 8.37 1973 160.80 0.53 17.09 0.40 62.77 6.86 240.66 7.79 1976 187.48 0.53 62.79 1.46 93.81 9.28 344.09 11.28 1977 851,95 3.03 49.23 1.10 77.90 8.60 979.08 12.73 j 1978 361.20 0.53 31.23 0.60 72.46 6.41 464.89 7.54 1979 1,017.73 1.26 92.27 2.13 50.44 4.57 1,160.45 7.95 1980 2,650.56 4.17 9.33 0.21 52.48 '5.90 2,712.38 10.29 1981 21,860.89 17 35 40.,3 0.87 62.62 5.51 21,963.89 23.73 1982 4,866.27 6.29 118.54 1.59 35.41 2.63 5,020.22 10.50 1983 10,137.85 5.94 210.69 3.95 109.94 8.16 10,458.48 18.05 1984 2,582.35 1.93 162.19 2.82 57.19 4.52 2,801.73 9.26 1985 2,712.33 3.55 116.17 1.89 81.81 4.80 2,910.31 10.24 1986 5,813.38 7.75 107.20 1.78 52.69 3.08 5,973.27 12.61 1987 5,188.45 6.09 204.21 3.46 43.70 2.56 5,436.35 12.10 19LB 14,650.57 14.41 243.39 4.46 64.02 4.36 14,957.98 23.24

__ ____ _ - > - _ _ . - - - - - - - - - - - - - - - - - - - - - - - ~ - - - - - - - - - - - " - - - ^ " ^ ^ ^ " ' - ~ ~ ~ ~ ' ~ ~ ~ ~ ~ ~ ~ ' ~ ~ ~ ' ~ ~ ~ ' ~ ~ ^ ' ~ ~ ' ~

l I

I Table 19. Numbers and Biomass (kg) Per Hectare of Each Size Group of Smallmouth Buffalo in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 Younst-of-Year Intermediate _ ..Adu L _ ,__ Total Numbers Biomass Numbers Biomass Numbers Biomass Numbers Biomass 1970 1.96 0.01 3.04 0.75 23.28 34.87 28.28 35.64 1971 0.58 0.02 36.05 71.13 0.00 0.00 36.63 71.15 1972 8.68 0.64 2.53 0.98 26.48 41.51 37.69 43.14 1973 1.74 0.15 1.39 0.40 21.21 40.84 24.34 41.39 1974 0.00 0.00 0.00 0.00 6.40 12.52 6.40 12.52 1975 1.79 0.15 0.78 0.16 6.39 18.86 8.96 19.17 1976 0.61 0.01 0.00 0.00 12.41 28.93 13.02 28.94 1977 2.33 0.16 1.82 0.72 7.49 9.93 11.64 10.82 l

1978 0.00 0.00 0.00 0.00 0.35 1.84 0.35 1 84 1979 0.00 0.00 0.00 0.00 3.31 4.57 3.31 4.57 1980 0.31 0.01 0.00 0.00 1.67 3.35 1.97 3.35 1981 0.00 0.00 0.43 0.15 1.58 2.75 2.01 2.90 1982 0.00 0.00 0.45 0.17 6.85 10.83 7.31 11.00 1983 36.77 0.81 0.00 0 00 3.30 5.59 40.07 6.41 1984 0.00 0.00 0.00 0.00 0.48 2.57 0.48 2.57 1985 3.64 0.16 1.73 0.53 4.86 4.30 10.23 4.98 1986 1.35 0.00 0.45 0.10 2.28 1.45 4.09 1.66 1987 0.00 0.00 0.00 0.00 2.86 7.40 2.86 7.40 1988 0.00 0.00 0.00 0.00 1.21 1.77 1.21 1,77

I\)

Table 20. Numbers and Biomass (kg) Per Hectare of Each Size Group of Spotted Sucker in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 YounR-of-Year Intermediate Adult Total Numbers Biomass Numbers Biomass Numbers Biomass Numbers Biomass 1970 18.02 0.10 0.68 0.07 0.47 0.23 19.17 0.40 1971 21.16 0, ',0 0.00 0.00 8.76 2.76 29.92 3.06 1972 38.06 0.81 2.00 0.32 19.79 6.68 59.85 7.82 1973 162.46 3.28 7.13 1.08 17.56 5.95 187.14 10.32 1974 23.71 0.36 26.16 3.54 39.10 13.07 88.97 16.96 1975 10.71 0.17 10.98 1.41 19.72 8.84 41.42 10.42 1976 15.29 0.28 3.15 0.51 35.12 17.17 53.55 17.96 1977 18.19 0.30 2.84 0.37 23.23 11.41 44.26 12.08 1978 6.23 0.09 5.25 0.64 14.85 7.48 26.33 8.21 1979 8.99 0.07 6.05 0.80 11.20 5.73 26.23 6.60 1980 3.09 0.02 0.31 0.05 10.61 7.24 14.01 7.31 1981 0.00 0.00 0.00 0.00 12.47 9.34 12.47 9.34 1982 0.43 0.02 0.43 0.03 5.83 3.45 6.70 3.50 1983 5.37 0.01 3.90 0.46 2.82 2.58 12.09 3.05 1984 12.20 0.06 19.02 2.48 8.63 3.87 39.85 5.41 l 1985 0.91 0.02 11.82 1.43 8.64 5.91 21.36 7.36 1986 1.36 0.01 2.72 0.31 4.97 2.70 9.05 3.03 1987 1.36 0.01 5.91 0.72 2.74 1.43 10.01 2.16 1988 0.48 T 0.95 0.12 5.56 2.67 6.98 2.79 L

l

a Table 21. Numbers and Biomass (kg) Per Hectare of Each Size Group .l of Channel Catfish in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 i

_Youna-of-Year Intermediate 4duJt Total !

Numbers Biomass Numbers Biomass Numbers Biomass Numbers Biomass ;

1970 3.27 0.02 10.10 0.62 5.71 _ 2.35 19.07 2.98 1971 0.99 0.01 12.73 0.86 20.19 9.89 33.91 10.76 1972 1.05 0.01 12.32 0.79 23.20 7.33 36.57 8.12 1973 1.23 0.01 12.07 0.71 29.68 9.64 42.98 10.36 1974 0.52 1.01 3.21 0.19 8.41 3.92 12.14 4.12 1975 1.03 0.01 2.39 0.11 10.27 4.13 13.69 4.25 1976 1.63 0.00 6.26 0.32 17.67 12.11 25.56 12.43 1977 2.75 0.02 4.55 0.27 12.14 7.12 19.44 7.40 1978 1,38 0.00 0.35 0.01 13.45 4.17 15.18 4.18 1979 1.05 0.01 1.40 0.04 22.35 14.19 24.80 14.24 1980 2.90 0.01 0.42 0.02 11.34 7.70 14.65 7.73 1981 6.41 0.06 4.17 0.12 67.02 59.00 77.60 59.17 l 1982 0.00 0.00 0.91 0.03 5.98 7.12 6.21 6.01 1983 0.00 0.00 0.00 0.00 11.22 12.69 11.22 12.69 1984 0.00 ~ 0.00 0.45 0.02 9.80 11.62 10.25 11.64 1985 0.44 0.00 8.40 0.45 7.32 8.97 16.16 9.42 1986 2.22 0.01 4.89 0.18 0.44 0.59 7.56 0.79 1987 0.45 0.01 0.00 0.00 3.24 3.62 3.69 3.63 1988 1.85 0.01 9.62 0.39 35.04 10.10 46.51 10.50 l

i 1

l~

l l

Table 22. Numbers and Biomass (kg) Per Hectare of Each Size Group of Flathead Catfish in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 Young-of-Year Intermediate Adult Total Numbers Biomass Numbers Biomass Numbers Biomass Numbers Biomass 1970 3.51 0.01 0.43 0.07 1.36 0.51 5.30 0.60 1971 2.89 0.01 1.92 0.32 0.47 0.20 5.27 0.53 1972 0.78 0.00 1.06 0.08 1.65 0.98 3.49 1.06 1973 1.03 0.01 0.77 0.13 4.10 2.12 5.91 2.26 l 1974 0.00 0.00 0.74 0.08 2.40 1.23 3.14 1.31

( 1975 0.77 0.00 1.57 0.24 0.86 0.36 3.20 0.60 1976 1.21 0.00 0.00 0.00 1.50 0.81 2.70 0.81 1977 3.51 0.01 0.98 0.12 1.21 0.70 5.70 0.83 i 1978 1.12 0.00 1.74 0.18 1.22 0.40 4.08 0.58 1979 0.00 0.00 0.77 0.12 1.12 0.43 1.89 0.55 1980 0.34 0.00 0.00 0.00 0.00 0.00 0.34 0.00 1 1981 20.00 0.14 1.23 0.12 0.00 0.00 21.23 0.26 l 1982 0.87 0.00 0.00 0.00 0.87 0.63 1.74 0.63 1983 0.00 0.00 0.49 0.01 0.00 0.00 0.49 0.01 1984 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1985 0.00 0.00 0.00 0.00 0.44 0.20 0.44 0.20 1986 0.91 0.00 0.00 0.00 0.44 0.13 1.35 0.13 1987 0.00 0.00 0.00 0.00 0.44 0.24 0.44 0.24 1988 0.47 T 0.00 0.00 0.00 0.00 0.47 T l

l

! Table 23. Numbers and Biomass (kg) Per Hectare of Each Size Group

( of White Bass in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 Young-of-Year Intermediate Adult Total Numbers Biomass Numbers Biomass Numbers Biomass Numbers Biomass 1970 47.30 0.20 0.12 0.01 0.00 0.00 47.42 0.21 l 1971 4.07 0.08 0.00 0.00 0.00 0.00 4.07 0.08 l 1972 3.30 0.06 0.27 0.02 0.00 0.00 3.57 0.08 1973 13.96 0.15 1.33 0.07 1.12 0.22 16.42 0.44 1974 2.61 0.04 0.00 0.00 0.85 0.16 3.46 0.20 1975 0.00 0.00 0.00 0.00 0.27 0.06 0.27 0.06 1976 3.86 0.08 1.40 0.10 0.47 0.06 5.72 0.24 1977 35.48 0.38 2.79 0.16 0.00 0.00 38.27 0.54 1978 11.03 0.03 0.00 0.00 0.00 0.00 11.03 0.03

! 1979 3.16 0.05 0.00 0.00 0.00 0.00 3.16 0.05 1980 11.25 0.05 0.00 0.00 0.00 0.00 11.25 0.05 1982 1.43 0.03 0.48 0.03 0.48 0.08 2.38 0.14 1983 0.00 0.00 0.00 0.00 1.46 0.18 1.46 0.18 1984 0.00 0.00 0.00 0.00 1.82 0.32 1.82 0.32 1985 37.27 0.79 5.91 0.33 0.44 0.09 43.63 1.20 1986 21.34 0.72 172.25 11.70 1.82 0.25 195.44 12.66 1987 16.04 0.25 1.78 0.09 0.00 0.00 17.82 0.35 1988 29.37 0.33 5.12 0.27 1.86 0.28 36.35 0.88 l

l l

Table 24. Numbers and Biomass (kg) Per Hectare of Each Size Group of Yellow Bass in Cove Rotonone Samples, Chickamauga Reservoir, 1970-1988

)

Yount-of-Year Intermediate Adult Total Numbers Biomass Numbers Biomass Numbers Bionass Numbers Biomass 1971 0.91 0.00 0.27 0.02 0.00 0.00 1.18 0.02 1972 21.90 0.15 0.26 0.02 0.54 0.06 22.70 0.23 1973 16.65 0.19 4.65 0.28 0.00 0.00 21.30 0.47 1974 6.63 0.11 1.92 0.14 0.00 0.00 8.55 0.25 1975 19.37 0.33 12.01 0.95 2.01 0.26 33.39 1.54 1976 48.09 0.19 8.76 0.59 3.82 0.47 60.67 1.26 1977 238.76 0.94 6.52 0.56 2.62 0.30 247.91 1.80 1978 106.99 0.29 5.90 0.45 2.70 0.33 115.59 1.06 1979 3.84 0.05 0.38 0.03 0.38 0.04 4.61 0.13 1980 121.22 0.48 5.46 0.50 1.18 0.15 127.85 1.13 1981 187.95 4.29 69.19 4.56 10.23 1.26 267.37 10.11 1982 232.81 1.15 37.20 2.94 6.04 0.77 276.05 4.86 1983 95.83 0.80 16.34 1.46 12.62 1.68 124.79 3.94 1984 100.14 0.56 9.70 0.70 1,82 0.25 111.65 1.50 1985 84.19 0.46 32.09 2.58 9.64 1.20 125.92 4.24

! 1986 103.22 1.44 56.70 3.18 6.74 0.91 166.66 5.54

! 1987 70.48 0.66 5.93 0.34 2.76 0.33 79.17 1.34 1988 174.59 1.21 6.70 0.46 0.94 0.21 182.23 1.87 l

I

l Table 25. Numbers and Biomass (kg) Per Hectare of Each Size Group of Warmouth in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 Young-of-Year Intermediate Adult Total Numbers Biomass Numbers Biomass Numbers Biomass Numbers Biomass 1970 7.18 0.03 4.44' O.11 2.30 0.17 13.92 0.30 l 1971 37.62 0.09 10.65 0.23 0.00 0.00 48.27 0.32 l 1972 39.04 0.13 14.26 0.38 1.88 0.15 55.18 0.66 1973 195.94 1.09 9.40 0.25 8.17 0.65 213.51 2.00 1974 8.92 0.02 3.79 0.07 0.98 0.07 13.68 0.16 1975 38.28 0.06 4.67 0.08 2.82 0.27 45.77 0.41 1976 54.55 0.07 12.34 0.26 5.68 0.41 72.57 0.74 1977 233.55 0.41 9.93 0.15 6.12 0.46 249.60 1.02 1978 313.63 0.31 26.19 0.54 9.05 0.79 348.87 1.64 1979 844.05 0.95 34.19 0.65 18.29 1.55 896.53 3.15 1980 1,282.81 1.67 13.77 0.32 7.42 0.64 1,304.00 2.64 l 1981 2,733.15 5.32 56.63 1.12 32.43 2.21 2,822.21 8.65 l 1982 1,712.30 1.92 45.06 0.77 10.92 0.76 1,768.28 3.45 1983 3.463.73 2.50 53.73 0.84 9.38 0.79 3,526.84 4.13 1984 1.579.34 2.20 74.19 0.92 6.69 0.45 1,660.22 3.58 1985 311.27 0.40 24.55 0.39 0.45 0.03 336.27 0.81 1986 1,050.77 1.26 27.14 0.53 6.38 0.44 1,084.28 2.24 1987 1,588.89 1.95 80.87 1.50 22.31 2.33 1,692.08 5.77 1988 1,290.27 2.06 54.27 1.04 32.95 3.78 1,377.50 6.88 i

l

l l

Table 26. Numbers and Biomass (kg) Per Hectare of Each 312e Group of White Crappie in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 Yount-of-Year __ Intermediate Adult Total Numbers Biomass Numbers Biomass Numbers Biomass Numbers Biomass 1970 89.00 0.11 28.51 1.19 20.68 3.09 138.18 4.39 1971 7.90 0.05 13.69 1.04 17.95 3.14 39.54 4.23 1972 29.80 0.10 13.33 0.48 12.55 2.52 55.68 3.11 1973 24.31 0.07 15.29 0.69 16.30 2.94 55.90 3.70 ,

1974 0.60 0.00 2.14 0.07 7.15 1.15 9.88 1.22 f 1975 1.13 0.00 4.31 0.27 7.80 1.07 13.25 1.35 1976 26.53 0.06 14.70 0.24 7.65 1.25 48.88 1.55 1977 66.00 0.18 16.16 0.18 8.59 1.20 90.75 1.56 1978 116.93 0.27 26.24 0.98 12.34 1.46 155.50 2.71 1979 57.10 0.12 26.41 0.59 28.16 2.87 111.67 3.58 1980 9.31 0.02 8.42 0.09 12.86 1.74 30.59 1.85 1981 10.43 0.02 14.13 0.15 5.59 0.99 30.16 1.17 1982 118.97 0.21 4.57 0.05 3.25 0.60 126.79 0.86 1983 99.81 0.22 15.32 0.14 0.49 0.04 115.62 0.40 1984 80.87 0.17 5.77 0.14 0.98 0.10 87.61 0.41 1985 43.88 0.10 32.34 0.36 2.64 0.40 78.86 0.86 1986 29.04 0.05 14.70 0.21 0.44 0.04 44.18 0.29 1987 262.92 0.60 11.04 0.11 0.00 0.00 273.96 0.71 1988 86.11 0.18 13.35 0.13 0.00 0.00 99.46 0.31 i

l

l Table 27. Numbers and Biomass (kg) Per Hectare of Each Size Group of Sauger in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988

_YounR-of-Year Intermediate Adult Total Numbers Biomass Numbers Biomass Numbers Biomass Numbers Biomass 1970 0.00 0.00 0.00 0.00 0.75 0.23 0.75 0.23 1972 0.54 0.03 0.81 0.07 0.27 0.09 1.61 0.19 1973 2.23 0.13 0.58 0.09 2.59 0.60 5.40 0.82 1974 1.39 0.07 0.26 0.02 0.85 0.19 2.50 0.28 1975 0.27 0.02 1.46 0.21 0.19 0.03 1.92 0.26 l

l 1976 0.00 0.00 0.00 0.00 3.39 0.78 3.39 0.78 1977 6.52 0.25 0.41 0.03 0.00 0.00 6.93 0.28 1978 0.00 0.00 0.79 0.10 0.69 0.14 1.48 0.24 1979 0.00 0.00 1.40 0.14 0.47 0.08 1.86 0.23 1980 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1981 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 l 1982 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 j 1983 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1984 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1985 0.00 0.00 0.00 0.00 0.44 0.10 0.44 0.10 1986 0.00 0.00 0.00 0.00 0.45 0.25 0.45 0.25 1987 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1988 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 l

l

L l

l l Table 28. Numbers and Biomass (kg) Per Hectare of Each Size Group l of Yellow Perch in Cove Rotenone Samples. Chickamauga Reservoir, 1970-1988 Yount-of-Year Intermediate Adult Total Numbers. Biomass Numbers Biomass . Numbers Biomass Numbers Biomass 1970 11.81 0.04 4.92 0.04 0.21 0.01 16.94 0.10 1971 0.00 0.00 28.77 0.29 4.26 0.28 33.03 0.57 1972 0.00 0.00 26.89 0.30 5.37 0.27 32.25 0.57 1973 0.00 0.00 7.68 0.09 15.73 0.76 23.41 0.85 1974 0.00 0.00 2.08 0.03 6.22 0.41 8.30 0.44 1975 0.27 0.00 3.18 0.03 0.91 0.06 4.36 0.09 1976 0.00 0.00 28.35 0.28 3.84 0.21 32.19 0.49 1977 42.99 0.11 89.64 0.54 15.01 0.61 147.65 1.25 1978 195.38 0.50 96.60 0.56 36.33 1.67 328.31 2.72 1979 0.38 0.00 26.80 0.19 43.06 2.11 70.25 2.31 1980 95.76 0.26 65.24 0.38 31.77 2.39 192.76 3.03 1981 39.05 0.12 56.11 0.36 25.35 1,17 120.50 1.64 1982 26.96 0.06 18.87 0.11 19.30 1.11 65.12 1.28 1983 49.27 0.13 33.27 0.20 22.59 0.97 105.14 1.30 1984 28.29 0.07 19.02 0.11 15.59 0.79 62.90 0.98 1985 59.09 0.17 26.41 0.14 3.20 0.28 88.70 0.58 1986 4.18 0.01 42.66 0.26 4.08 0.14 50.92 0.40 1987 11.23 0.03 34.22 0.20 7.41 0.38 52.86 0.61 1988 178.87 0.47 78.24 0.45 42.46 1.71 299.57 2.63 l

l

l l

l Table 29. Numbers and Biomass (kg) Per Hectare of Each Size Group of Freshwater Drum in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 Yount-of-Year Intermediate Adult Total Numbers Biomass Numbers Biomass Numbers Biomass Numbers Biomass 1970 109.45 0.76 211.63 12.38 96.91 _16.34 417.99 29.48 f 1971 72.45 0.93 139.24 8.21 58.07 8.40 269.77 17.54 l 1972 305.07 3.72 153.91 9.71 127.07 25.45 586.05 38.88 1973 228.57 1.87 307.13 15.63 125.75 21.71 661.45 39.21 1974 27.10 0.21 165.60 7.68 '62.02 10.33 254.72 18.22 1975 33.86 0.29 68.26 3.96 37.15 8.09 139.26 12.35 1976 77.81 0.52 125.65 7.08 119.88 19.32 323.34 26.92 1977 62.65 0.60 116.64 6.73 127.61 17.95 306.90 25.28 1978 0.34 0.00 73.93 4 46 82.26 11.23 156.54 15.70 1979 5.87 0.06 68.65 4.15 100.96 13.30 175.47 17.51 1980 2.76 0.02 27.73 1.74 116.01 15.76 146.50 17.51 l

1981 6.31 0.04 57.13 3.52 247.53 38.22 310.97 41.78 l 1982 1.39 0.02 68.89 3.96 152.82 20.98 223.10 24.96 1983 50.62 0.36 95.04 5.61 166.78 24.21 312.44 30.18 1984 36.37 0.22 102.86 4.86 90.94 12.36 230.17 17.44 l 1985 102.65 0.69 116.16 6.81 142.92 22.59 361.73 30.10 1986 14.54 0.14 29.80 1.62 74.81 11.64 119.15 13.40 1987 30.11 0.24 84.39 4.05 110.75 15.29 225.26 19.58 1988 2.75 0.05 72.00 3.82 89.67 11.29 164.42 15.16

l Table 30. Numbers and Biomass (kg) Per Hectare of Each Size Group of Largemouth Bass in Cove Rotenone Samples, Chickamauga Reservoir, 1970-1988 Yount-of-Year Intermediate Adult Total Numbers Biomass Numbers Biomass Numbers Biomass Nu:abers Biomass 1970 263.10 0.69 22.41 2.05 9.58 2.89 295.09 5.63 1971 64.88 0.35 35.72 1.89 20.59 6.67 121.20 0.90 1972 21.16 0.17 60.90 4.06 14.62 4.94 96.68 9.18 1973 66.45 0.43 69.09 4.86 26.93 6.71 162.46 12.01 1974 27.57 0.11 20.43 1.73 19.07 4.91 67.08 6.76 1975 65.56 0.23 23.82 1.68 17.35 6.32 106.74 8.23 1976 38.80 0.19 34.59 1.36 13.53 5.86 86.92 7.41 1977 251.89 1.07 130.99 3.77 16.76 3.92 399.64 8.76 1978 506.83 1.91 54.77 1.82 19.98 4.96 581.58 8.69 1979 784.76 2.25 27.21 2.00 22.44 7.40 834.42 11.65 1980 863.78 3.82 101.05 1.78 12.01 5.47 976.84 11.08 1981 468.11 2.98 219.40 5.76 28.02 8.13 715.53 16.87 1982 321.76 1.08 91.40 5.62 29.53 6.18 442.69 12.88 1983 259.60 1.37 71.27 2.67 30.79 6.91 361.67 10.95 1984 379.15 1.36 40.84 2.48 10.93 3.39 430.92 7.23 1985 136.96 0.77 115.07 3.65 51.78 13.73 303.81 18.15 1986 91.88 0.54 100.78 3.09 6.69 1.66 199.35 5.28 1987 228.08 1.12 97.65 3.87 28.33 6.64 354.05 11.64 l 1988 158.10 0.76 72.88 2.54 22.52 6.10 253.50 9.40 l

l l

_ - _ - - - _ _ _ _ _ _ _ - _ - _ _ _ - - - _ - - - _ - - _ _ - - _ _ _ - - - - - - - - - - _ - - - _ _ - - _ - - - - - _ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

ML20247J761

Text

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