ML20100L028
| ML20100L028 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 10/31/1984 |
| From: | Baker W, Greene G, Mcaden D HOUSTON LIGHTING & POWER CO. |
| To: | |
| Shared Package | |
| ML20100K992 | List: |
| References | |
| NUDOCS 8412110411 | |
| Download: ML20100L028 (58) | |
Text
. . _ . - - . - . .
Il !
I i lI l.
I I
I SOUTH TEXAS PROJECT ELEC1 RIC GENERATING STATION I
I lI REPORT #1 I
lI COLORADO RIVER ENTRAINMENT AND IMPINGEMENT MONITORING PROGRAM l
! PHASE TWO STUDIES - JULY,1983 - JUNE,1984 l OCTOBER,1984 l lI I
I g pnwampa
I I
I I
REPORT #1 COLORADO RIVER ENTRAINMENT AND IMPINGEMENT MONITORING PROGRAM PHASE TWO STUDIES - JULY, 1983-JUNE, 1984 I
PREPARED FOR SOUTH TEXAS PROJECT I -
I SUBMITTED BY ECOLOGY DIVISION, ENVIRONMENTAL PROTECTION DEPARTMENT HOUSTON LIGHTING & POWER COMPANY 1
I OCTOBER 1984 I
I
, PREPARED BY: DAVID C. McADEN, GEORGE N. GREENE, WILLIAM B. BAKER, JR.
I
.I
I TABLE OF CONTENTS PAGE LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I 2
METHODS ...............................
SAMPLING SCHEDULE AND STATIONS . . . . . . . . . . . . . . . . . . 2 FIELD AND LABORATORY PROGRAMS .................. 2 Imp 5ngement . . . . . . . . . . . . . . . . . . . . . . . . . 2 i Entrainment . . . . . . . . . . . . . . . . . . . . . . . . . 3 Colorado River . . . . . . . . . . . . . . . . . . . . . 4 I S11tation Basin .................... 7 8
RESULTS AND DISCUSSION . . . . . . . . . . . . . . . . . . . . . . . .
HYDROLOGY AND WATER QUALITY ................... 8 MACR 0 ZOOPLANKTON AND ICHTHYOPLANKTON . . . . . . . . . . . . . . . 9 MACR 0 INVERTEBRATES AND FISH . . . . . . . . . . . . . . . . . . 13 I
I I
I I
lI I
I LIST OF TABLES TABLE PAGE 1 TEMPORAL VARIATIONS IN TEMPERATURE, TURBIDITY, pH AND DISSOLVED OXYGEN AT MID-CHANNEL OF THE COLORADO RIVER (JULY-SEPTEMBER,. 1983) . . 15 2 TEMPORALANDSPATIALVARIATIONSINCONDUCTIVITY(MILLIMHOS/CM)
AT MID-CHANNEL OF THE COLORADO RIVER (JULY-SEPTEMBER, 1983) . . . . . 16 3 TEMPORAL AND SPATIAL VARIATIONS IN SALINITY (PPT) AT MID-CHANNEL OF THE COLORADO RIVER (JULY-SEPTEMBER, 1983) . . . . . . . . . . . . . 17 4 TEMPORAL VARIATIONS IN SURFACE WATER QUALITY PARAMETERS IN THE RMPFSILTATIONBASIN(AUGUST-SEPTEMBER,1983) . . . . . . . . . . . . 18 5 TEMPORAL VARIATIONS IN TEMPERATURE, CONDUCTIVITY, SALINITY, DISSOLVED OXYGEN AND pH AT THE STP REVOLVING SCREENS (JULY-SEPTEMBER, 1983) . . . . . . . . . . . . . . . . . . . . . . . . 19 6 AVERAGE COLORADO RIVER FLOW (CFS) ON DATES OF SAMPLE COLLECTION, JULY-SEPTEMBER, 1983 . . . . . . . . . . . . . . . . . . . . . . . . . 20 7 RESERVOIR MAKEUP PUMPING FACILITY (RMPF) DAILY PUMPAGE, IN CUBIC METERS JULY-SEPTEMBER, 1983 . . . . . . . . . . . . . . . . . . 21 8 MACR 0 ZOOPLANKTON AND FISH TAXA COLLECTED IN THE COLORADO RIVER BY 0.5-M PLANKTON NET, JULY-SEPTEMBER, 1983 .............22 3
9 NUMBER (PER 100 M ) 0F MACROZ00 PLANKTON COLLECTED IN THE 25 COLORADO RIVER BY 0.5-M PLANKTON NET ON 14-15 JULY 1983 . . . . . . .
3 10 NUMBER (PER 100 M ) 0F MACR 0Z00 PLANKTON COLLECTED IN THE COLORADO RIVER BY 0.5-M PLANKTON NET ON 27-28 JULY 1983 .......27 3
11 NUMBER (PER 100 M ) 0F MACR 0Z00 PLANKTON COLLECTED IN THE 29 1
I COLORADO RIVER BY 0.5-M PLANKTON NET ON 9-10 AUGUST 1983 . . . . . . .
3 12 NUMBER (PER 100 M ) 0F MACROZ00 PLANKTON COLLECTED IN THE 30 COLORADO RIVER BY 0.5-M PLANKTON NET ON 15-16 SEPTEMBER 1983 . . . . .
13 LIST OF FISH TAXA COLLECTED IN 0.5-M PLANKTON NET SAMPLES FROM THE COLORADO RIVER (C.R.) AND THE SILTATION BASIN (S.B.),
l JULY-SEPTEMBER, 1983 . . . . . . . . . . . . . . . . . . . . . . . . . 32 3
g 14 NUMBER (PER 100 M ) 0F ICHTHYOPLANKTON COLLECTED IN THE g COLORADO RIVER BY 0.5-M PLANKTON NET ON 14-15 JULY 1983 .......33 3
15 NUMBER (PER 100 M ) 0F ICHTHYOPLANKTON COLLECTED IN THE 34 COLORADO RIVER BY 0.5-M PLANKTON NET ON 27-28 JULY 1983 . . . . . . .
l I
l I
E
n I 1 LIST OF TABLES TABLE PAGE 3
16 NUMBER (PER 100 M ) 0F ICHTHYOPLANKTON COLLECTED IN THE COLORADO RIVER BY 0.5-M PLANKTON NET ON 9-10 AUGUST 1983 . . . . . . . 35 3
17 NUMBER (PER 100 M ) 0F ICHTHYOPLANKTON COLLECTED IN THE l COLORADO RIVER BY 0.5-M PLANKTON NET ON 15-16 SEPTEMBER 1983 . . . . . 36 '
18 NUMBER (PER 100 M ) 0F MACR 0 ZOOPLANKTON AND ICHTHYOPLANKTON COLLECTED IN THE SILTATION BASIN BY 0.5-M PLANKTON NET ON 9-10 AUGUST 1983 . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 3
19 NUMBER (PER 100 M ) 0F MACR 0 ZOOPLANKTON AND ICHTHYOPLANKTON COLLECTED IN THE SILTATION BASIN BY 0.5-M PLANKTON NET ON I 15-16 SEPTEMBER 1983 . . . . . . . . . . . . . . . . . . . . . . . . . 38 20 MACR 0 INVERTEBRATE AND FISH TAXA COLLECTED IN THE COLORADO RIVER I BY TRAWL, SEINE AND REVOLVING SCREENS, JULY-SEPTEMBER 1983 . . . . . .
TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (m) 0F 39 21 MACR 0 INVERTEBRATES AND FISH COLLECTED IN THE COLORADO RIVER BY I TRAWL ON 14-15 JULY 1983 . . . . . . . . . . . . . . . . . . . . . . . 41 I 22 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (m) 0F MACR 0 INVERTEBRATES AND FISH COLLECTED IN THE COLORADO RIVER BY TRAWL ON 27-28 JULY 1983 . . . . . . . . . . . . . . . . . . . . . . . 42 23 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (m) 0F MACR 0 INVERTEBRATES AND FISH COLLECTED IN THE COLORADO RIVER BY TRAWL ON 9-10 AUGUST 1983 ......................44 24 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (m) 0F MACR 0 INVERTEBRATES AND FISH COLLECTED IN THE COLORADO RIVER BY TRAWL ON 15-16 SEPTEMBER 1983 ....................45 25 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (m) 0F MACR 0 INVERTEBRATES AND FISH COLLECTED IN THE COLORADO RIVER BY SEINE ON 14-15 JULY 1983 . . . . . . . . . . . . . . . . . . . . . . . 46 26 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (m) 0F MACR 0 INVERTEBRATES AND FISH COLLECTED IN THE COLORADO RIVER BY I- SEINE ON 27-28 JULY 1983 . . . . . . . . . . . . . . . . . . . . . . . 47
-g 27 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (m) 0F g MACR 0 INVERTEBRATES AND FISH COLLECTED IN THE COLORACO RIVER BY
......................48 SEINE ON 9-10 AUGUST 1983 28 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (m) 0F I MACR 0 INVERTEBRATES AND FISH COLLECTED IN THE COLORADO RIVER BY SEINE ON 15-16 SEPTEMBER 1983 ....................49 I
I n
g .
LIST OF TABLES PAGE TABLE l
29 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (m) 0F MACR 0 INVERTEBRATES AND FISH IMPINGED ON 2 INTAKE SCREENS IN I 30 MINUTES ON 13-14 JULY 1983 ....................50 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (m) 0F I 30 MACR 0 INVERTEBRATES AND FISH IMPINGED ON 2 INTAKE SCREENS IN 30 MINUTES ON 21-22 JULY 1983 . . . . . . . . . . . . . . . . . . . . 50 31 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (m) 0F MACR 0 INVERTEBRATES AND FISH IMPINGED ON 2 INTAKE SCREENS IN 30 MINUTES ON 27-28 JULY 1983 . . . . . . . . . . . . . . . . . . . . 51 32 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (m) 0F MACR 0 INVERTEBRATES AND FISH IMPINGED ON 2 INTAKE SCREENS IN 30 MINUTES ON 9-10 AUGUST 1983 . . . . . . . . . . . . . . . . . . . . 51 l
33 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (m) 0F MACR 0 INVERTEBRATES AND FISH IMPINGED ON 2 INTAKE SCREENS IN 30 MINUTES ON 15-16 SEPTEMBER 1983 . . . . . . . . . . . . . . . . . . 52
- g 1
1 i
LI iI I
I lI '"
I l INTRODUCTION Section 6.1.3.2 and Appendix E of the Final Environmental Statement requires Phase Two of the aquatic ecology studies to begin within one week of the start of reservoir fill pumping. The objective of Phase Two studies is to determine the number and type of aquatic organisms which are (a) impinged on the revolving screens and (b) entrained by the reservoir fill pumps during the filling of the main cooling reservoir. Phase One studies, conducted in 1975-76, resulted in predictions of impingement and entrainment losses and I Phase Two is designed to confirm the accuracy of those predictions. Sampling methods remain the same as in Phase One. Phase One samples were collected at four locations in the Colorado River, designated as Stations 1,2,3 and 5.
Phase Two samples are to be collected only at Station 2, i.e., in the Colorado River adjacent to the Reservoir Makeup Pumping Facility (RMPF) and in the Siltation Basin, the body of water located between the RMPF revolving screen structure and the pump structure.
On 11 July 1983, coeling reservoir filling operations began at the South Texas Project in Matagorda County, Texas. This report presents data collected during July, August and September 1983. After the third week of September, no further reservoir filling occurred in 1983 or through the first six months of 1984. The data presented in the following report therefore constitute the information collected during the period July, 1983, through June, 1984.
I I
I i
I
I METHODS SAMPLING SCHEDULE AND STATIONS
~
I The aquatic ecology study is divided into two distinct types of studies, impingement and entrainment, requiring different gear types and methodologies.
The impingement study is conducted on the revolving screen structure, which extends 423.5 ft along the west bank of the Colorado River at River Mile 14.6.
The entrainment study is conducted at two locations: 1) in the Colorado River adjacent to and slightly downstream of tne screen structure, and 2) in the siltation basin between the pump structure and the submerged weir.
I FIELD AND LABORATORY PROGRAMS Impingement I
Impingement samples are collected within one we'ek of the start of each I pumping period and weekly thereafter as long as pumping continues. Each week, thiee samples are collected over a 24-hr period. Prior to the start of each revolving screen sample, 2 of the 24 screens are selected at random and run for 15 min to clean them of accumulated debris. The two screens are then sampled for a 30-min period by placing a tight-fitting dip net with 1/4-in I mesh at the lower end of the screenwash trough and filtering all the organisms l washed off the screens. While the sample is being collected, hydrology and l
water quality parameters are recorded from the siltation basin behind the screen structure. Surface and bottom readings of water temperature ('C),
conductivity (millimhos/cm) and dissolved oxygen (ppm) and a surface reading of pH are recorded as are the number and size of RMPF pumps operating at the I
2 I
I time of sample collection. The Colorado River flow (cfs) is also noted on the g field data sheets.
After the two screens have been sampled for 30 min, the collecting net is checked for fish, shrimp and crabs. Those found are placed in a plastic I sample jar, preserved with 10% buffered formalin and taken to the laboratory l for identification and enumeration. In the laboratory, each sample is rinsed,
! sorted by species and the total weight by species and individual lengths (standard length for fish, total for shrimp) or widths (carapace width for crabs) are recorded. If over 50 individuals of the same species occur in a l sample, a subsample of 50 is measured. The remainder are counted and the I
l weight of the total is recorded.
1 Enfrainment Entrainment sampling commences within one week of the start of each cooling reservoir filling period and is conducted at least every othen week as long as pumping continues. A set of samples is collected every 6 hrs over a 24-hr period. During the months of March-May and August-December, sampling is done weekly when the salinity at the -8.5 ft level in the Colorado River l exceeds 3 ppt. Salinity probes have been mounted on a piling in the river near the RMPF at that depth and are connected to a continuous chart recorder to provide a record of salinity fluctuations. The recorder is checked daily and, if the 3 ppt level is exceeded, the appropriate personnel are notified to initiate sampling. During the initial months of pumping in 1983, instrumentation and procedural problems resulted in the total loss of I
I
I I continuous salinity data. However, salinity data was collected in conjuction with biological sampling and is discussed later in this report.
Colorado River Prior to the start of collection of each set of biological samples, surface and bottom readings of conductivity (which was later converted to salinity), water temperature and dissolved oxygen were taken at mid-channel of the Colorado River near the northern end of the RMPF screen structure.
Additional conductivity readings were made at 5-ft intervals between the surface and bottom. The primary instrument used to measure these parameters was a Hydrolab Model 8002 with 8100 series probe assembly. A Yellow Springs Instrument Co. Model 51A temperature and dissolved oxygen meter and an American Optical Co. hand-held refractometer were used as a backup to the g
primary system. Surface pH was measured with a portable Altex Model 531153 pH meter and water transparency was determined using a 200-m diameter Secchi disc.
A 0.5-m diameter, 3:1 (length: mouth diameter) plankton net with 0.5-mm square mesh was used to collect plankton samples at mid-channel of the Colorado River. Sampleswerecollectedatthesurface,mid-depth (10ft)and near the bottom. The plankton net was attached to a sled to keep the net about 4 inches above the bottom during towing for the bottom sample. A General Oceanics Model 2030 digital flowmeter mounted in the center of the net mouth was used to calculate the volume of water filtered during each tow. The flowmeter reading was recorded prior to and at the conclusion of each plankton l
I 4
I
tow. Each mid-channel sample was collected by lowering the net to the appropriate depth with the boat in a stationary position. All tows were made in the direction of river flow, i.e. north to south. Each tow started approximately 50 yds upstream of the RMPF and continued to a point approximately 50 yds downstream of the RMPF. Bottom tows were made at a slower forward speed than either the mid-depth or surface tows to insure that the net sled remained on the bottom. A wire-angle indicator and graduated I towline were used to verify the depth from which the mid-depth sample was collected. This was maintained at about 10 ft as the depth of the ::hannel is approximately 20 ft. The surface sample was taken by towing the net with the upper edge of the net mouth a few inches below the water's surface. At the end of each tow, the boat was held stationary in the river while the net was quickly brought to the surface. This was done in an effort to minimize l contamination of the sample due to the net being towed upward through the water column above the level being sampled. At the end of each tow the net was rinsed from the outside to wash the sample contents into the cod end l
bucket. The sample was then placed in a plastic jar, labeled and preserved I with 5% formalin. Rose Bengal was added to each sample several days before l
sample workup to facilitate visual separation of the organisms from trash and detritus.
lI A 0.5-m diameter, 3:1 (length: mouth diameter) plankton net with 0.5-mm square mesh equipped with a General Oceanics model 2030 digital flowmeter and a cable depressor was used to collect oblique-tow plankton samples near the l
west shoreline of the Colorado River. Before each sample was collected, the g flowmeter reading was recorded. After lowering the net to the bottom at the II s
I l
r north end of the RMPF screen structure, the net was towed downstream while the towline and attached plankton net was slowly ree' led in. When the net reached the surface, the boat was stopped, the net raised _ and the flowmeter reading recorded. After rinsing the net down from the outside, the sample was placed in a plastic jar, labeled and preserved with 5% buffered formalin. Rose Bengal was added to each sample as described above.
I A 20-ft (headrope length) otter trawl, with 1 1/4-in stretched mesh in the upper end and 3/8-in stretched mesh in the cod end, was towed on the bottom parallel to shore at mid-channel of the Colorado River to determine the species composition and abundance of the nekton (fish and macroinvertebrates).
Tows were of 5 min duration and were made in the direction of water flow.
Each trawl tow began approximately 50 yds upstream of the RMPF. Each sample was emptied into a large tub and inspected for larger specimens of fish and invertebrates. These were identitied, weighed, measured and returned to the river. The remainder of the sample was preserved in 10% formalin and taken to the laboratory for analysis.
Shallow shoreline populations of fish and invertebrates in the vicinity of the RMPF were sampled by use of a two-man bag seine. A 20-ft long x 6-ft high x 6-ft deep seine, with 1/2-in stretched mesh in the body and 1/4-in ace webbing in the bag, was pulled for a distance of approximately 75 ft along the west shore line downstream of the RMPF. The seine collections wer9 made by pulling the seine in the upstream direction (south to north) as the current helps in holding the bag of the seine open. Specimens taken by seining were handled as described above for trawl samples.
I
- I Siltation Basin I The method originally chosen to sample organisms from the siltation basin was to pump water to the top of the RMPF pump structure deck where it would be filtered through an ichthyoplankton net. During the first two collecting trips, on 14-15 July and 27-28 July 1983, repeated attempts were made to collect samples by this method. However, the pump could not overcome the head involved. Therefore, no siltation basin samples were collected on those
, dates. On the third trip, surface plankton samples were collected by hand-towing a 0.5-m (mouth diameter) ichthyoplankton net, having 0.5-mm square mesh, parallel to the front wall of the pump structure. Hand-towing the net at a deeper level in the water was not attempted because of the danger of the net being pulled into the mouth of one of the operating pumps. Towing the net by L
boat in the siltation basin was not possible because of the small size of the basin and the presence of several submerged obstructions.
I I
I I ,
I I
I I
I
I RESULTS AND DISCUSSION HYDROLOGY AND WATER QUALITY Water temperature, pH, turbidity (Secchi disc) and dissolved oxygen at the Colorado River station are given in Table 1. Tables 2 & 3 show the conductivity measurements and the derived salinity values. Water temperature.
salinity, dissolved oxygen and pH in the RMPF siltation basin are given in l
Table 4. Water temperature, conductivity, salinity, dissolved oxygen and pH at the RMPF revolving screens are given in Table 5.
I On 14-15 July a wedge of salt water was present in the Colorado River extending up to about 10 to 15 ft below the surface. The wedge was 2.3 to 3.0 C warmer than the overlying fresh water and was low in dissolved oxygen (maximum of 0.9 ppm).
I On 27-28 July no salt wedge was present (0.9 ppt at bottom) and fresh oxygenated water extended to the bottom. A salt wedge was re-established on 9-10 August and 15-16 September extending up to 10 to 15 ft from the surface
' and even up to 5 ft on 9 August. The bottom oxygen was again very low on these two days (0.1 to 0.5 ppm).
lI 1
In the RMPF siltation basin the water quality of the surface water was similar to that of the surface water in the river on the same dates.
At the revolving screens the water quality was similar to that of the river at comparable depths on the same dates.
!I 8
iI _- - . . . _ . . - , . . - . - . _ _ _ - - . - _ . . - - .. - ..
r I
The most ubiquitous species, as well as the most abundant, was the zoea larval stage of the xanthid mud crab, Rhithropanopeus barrisii. The second most abundant forms were the zoeal and postlarval stages of the ghost shrimp, Callianassa spp. The postlarval stage of the brown shrimp, Penaeus aztecus, and the white shrimp, P. setiferus, and the megalops and juvenile stages of the blue crab, Callinectes sapidus, were collected only sporadically and never in very high densities. It is possible that some of the crab megalops represented the non-commercial pygmy blue crab, C. similis, which is impossible to differentiate from C. sapidus at this stage of development.
A list of the common and scientific names of the egg, larval and juvenile stages of the fish taxa collected from both the Colorado River and the siltation basin is found in Table 13.
I Tables 14-17 show the changes in abundance which were observed, both temporally and spatially, in the Colorado River ichthyoplankton during the study period. The most notable trends seen in this limited amount of data are: (a) the relatively small numbers of ichthyoplankters frc>m the surface and oblique tows compared to the large numbers from the mid-depth and bottom tows and (b) the greater numbers of larval and juvenile fish in samples col-l lected at night, regardless of depth. The bay anchovy was the most abundant species, due primarily to its peak in abundance on 27-28 July. One possible explanation for the anchovy's apparent high level of. abundance is due to the low salinity observed from surface to bottom on those dates (see Table 3).
The bay anchovy is an estuarine species preferring salinities in excess of 10 ppt, and the fact they were caught in such large numbers during a period of I
10
I high freshwater flow and salinities less than 1 ppt indicates they were under stress. This made them more susceptible to capture by a plankton net than they would be under nonnal conditions, when they are probably just as dbundant, especially in the salt wedge (mid-depth to the bottom). The only other taxa collected regularly were two species of gobies and one category called Gobiidae larvae. The darter goby, Gobionellus boleosoma, and the naked goby, Gobiosoma bosci, are both estuarine, mid-depth to bottom dwelling species which are coinmon over mud substrates in all Texas estuaries. The larvae of the two genera are indistinguishable below about 5 mm, thus resulting in the unidentified Gobiidae larvae category.
I Because ichthyoplankton were taken in such small numbers in the samples collected in the siltation basin, they are included with the invertebrates on the tables showing temporal changes in abundance of organisms at this location (Tables 18 and 19). Penaeus setiferus (white shrimp) postlarvae peaked in abundance during the night on both collecting dr.tes, but were otherwise found only in low densities. Macrobrachium ohione, one of the river shrimps, and I Rhithropanopeus harrisit, a xanthid mud crab, were the most abundant species in the basin. M. ohione were much more abundant in the basin than they were in the Colorado River on the same dates (see Tables 11 and 12). This is easily explained by the fact that river shrimp zoeae and juveniles, the life stages collected in these samples, prefer shoreline areas with protective vegetation cover to open river channel habitat. The front wall of the RMPF pump structure, along which the plankton net was towed, afforded a semblance of shoreline habitat by accumulating floating pieces of wood, dead grasses and other types of vegetative material. Further evidence for the shoreline nature I
11
I I River flow during the samplir.g periods is shown in Table 6 and the daily volume of water pumped into the cooling reservoir during July - September, 1983 is shown in Table 7.
I MACR 0Z00 PLANKTON AND ICHTHYOPLANKTON I
Samples collected by 0.5-m plankton net in the Colorado River yielded 49 taxa of invertebrates and 10 taxa of vertebrates, (Table 8). The dominant invertebrate forms were cladocerans, or water fleas, which are all freshwater organisms; copepods, both freshwater and estuarine-marine in origin; and Malacostraca, consisting of estuarine mysid shrimp, freshwater and estuarine amphipods, estuarine-marine penaeids (commercial shrimp), freshwater and estuarine carideans (grass and river shrimp) and various species of crabs.
The fish were represented by as many as 10 taxa, but they were rarely a major compor.ent of any single sample. On some occasions, however, the bay anchovy did occur in large numbers.
lI Tables 9-12 show the temporal and spatial variations in density of invertebrates collected from the Colorado River on each of the four sampling trips. The largest total numbers of organisms were collected in mid-depth, bottom ano oblique tows and also in night collections. Higher densities appear to be closely related to the presence of a salt wedge at the -10 ft level a..d deeper, as occurred on 9-10 August and 15-16 September (See Table 3). A salt wedge also occurred on 14-15 July, but no bottom samples were collected on that trip because the bottom plankton net was lost during the first tow of the day.
lI II
I I of the siltation basin sampling location is the occurrence of Gambusia affinis, a shallow shoreline species of fish known as the mosquitofish, on both the 9-10 August and 15-16 September collecting dates. The megalops and juvenile life stages of the blue crab, Callinectes sapidus, were the only other taxa occurring in fairly high densities, and this was only on 9-10 August when they also peaked in abundance in river samples. Notable by its absence from the siltation basin were Callianassa spp. zoeae, which were very abundant in the river. They are, however, primarily a mid-depth and bottom dwelling group and the sampling technique used was not adequate for detecting their presence.
I i
I
'I I
I
'I
'I I
I I
12
f MACROINVERTESRATES AND FISH Trawl and seine samples yielded eight macroinvertebrate species, five shrimp, two crabs and a crayfish (Table 20 and Tables 21-28). The grass shrimp, Palaemonetes paludosus, the river shrimp, Macrobrachium ohione, and the crayfish, Procambarus blandingi acutus, are freshwater animals whereas the three penaeid shrimp and the two crabs are estuarine and marine. The blue crab, C6111nectes sapidus, however, is tolerant of tresh water and is known to migrate far upstream in rivers.
The river shrimp was the most comon invertebrate (818) closely followed by the white shrimp, Peneaus setiferus (760). The majority of the river shrimp were caught in trawls on 27-28 July while the majority of the white shrimp were caught in seines on 15-16 September.
Twenty-nine species of fish were collected in trawl and seine samples. Of these, four species are freshwater and 25 are estuarine or marine. The greatest number of species of fish (16) as well as the greatest number of individuals (3697) were recorded from the trawls taken on 27-28 July.
However, because the majority (97.7%) of the fish caught that day were bay l'
anchovies, Anchoa mitchilli, the diversity for that day is low. Except for the large number of anchovies on this one day, the catches in the trawls and seines were similar in number of species and total number of individuals taken.
'I
'I 13 I
I Impingement ' samples yielded 6 macroinvertebrate taxa, 2 of which were found only in the impingement samples (Tables 29-33). Palaemonid shrimp I dominated the species list (4 of 6 taxa), but the majority of individuals were blue crabs. With few exceptions the individuals were small, less than 30 mm g
in length (or width in the case of crabs).
Three species of fish were collected in the impingement samples, each represented by one individual. The green sunfish, Lepomis cyanellus, was the only freshwater fish and the only fish species caught by impingement that was not caught by trawl or seine.
I I
I 1
I lI e
I I
I I
14 l
TABLE 1 TEMPORAL VARIATIONS IN TEPPERATURE, TURBIDITY, pH AND DISSOLVED
' OXYGEN AT MID-CHANNEL OF THE COLORADO RIVER (JULY-SEPTEMBER, 1983)
Secchi disk Temperature (*C) pH Turbidity Dissolved 0 9(ppm) Bottom Surface Bottom Surface (inches) Surface Bottom Depth (ft)
Sampling Dates Time (CST) 27.2 29.5 7.4 16.5 6.1 0.6 21 14 July 1100 14 July 1720 26.6 29.6 7.4 13.0 6.5 0.4 22 14 July 2300 26.6 29.3 8.0 12.5 6.4 0.4 21 15 July 0845 26.1 29.0 7.7 11.0 7.2 0.9 21 27 July 1300 32.5 31.3 8.4 14.0 10.5 5.9 19 M
27 July 1920 32.8 31.5 8.4 17.0 10.9 7.2 19 l
28 July 0120 31.8 31.5 8.4 18.5 9.6 5.7 17 28 July 0720 31.6 31.4 8.4 19.0 9.4 6.4 16 9 August 1155 30.9 29.8 8.0 25.5 7.6 0.1 18 3 August 1800 29.9 29.8 8.0 24.5 7.9 0.1 19 l
9 August 2330 29.8 29.9 7.9 25.5 7.1 0.1 20 l
0600 29.4 29.9 7.9 26.0 6.1 0.1 17 10 August 15 September 1200 29.6 29.4 8.0 16.5 8.1 0.1 18 15 September 1745 30.5 29.3 8.2 16.5 10.2 0.5 17 15 September 2330 29.8 29.2 8.2 20.0 9.6 0.5 19 l
0600 29.2 29.1 8.2 19.5 7.3 0.5 18 16 September i
r-I TABLE 2 TEMPORAL AND SPATIAL VARIATIONS IN CONDUCTIVITY (MILLIMHOS/CM)
ATHID-CHANNELOFTHECOLORADORIVER(JULY-SEPTEMBER,1983)
I DEPTH (ft.)
Sampling Time S 5 10 15 20 B (Depth)
Dates (CST) l 14 July 1100 2.6 2.9 9.8 23.2 28.7 28.6 (21')
14 July 1720 2.4 2.5 6.2 20.0 22.0 26.0(22')
14 July 2300 1.9 2.0 5.7 16.5 24.9 25.5(21')
22.5(21')
l 15 July 0845 0.8 1.0 1.2 12.0 20.3 27 July 0.5 0.6 0.6 1.0 -
1.4 (19')
I 1300 27 July 1920 0.5 0.5 0.6 0.6 -
0.9 (19')
28 July 0120 0.6 0.6 0.6 0.6 -
1.9 (17')
28 July 0720 0.6 0.6 0.6 1.5 -
1.7(16')
9 August 1155 4.9 8.1 32.3 36.9 - 37.7(18')
9 August 1800 4.6 11.7 32.0 36.9 -
37.5(19')
9 August 2330 4.9 15.6 33.2 36.4 36.8 36.8(20')
10 August 0600 4.1 6.3 25.5 35.8 - 36.5(17')
I 15 September 1200 1.4 5.2 17.5 16.0 26.0 25.6 27.9(18')
26.6(17')
15 September 1745 1.5 4.8 -
2.9 3.3 7.6 25.4 -
26.2(19') 4 I 15 September 2330 16 September 0600 2.0 3.5 11.5 24.1 -
25.5(18')
I I
I I
I . - - . . _ - - - - _ - _ _ . . .
.c l
l l l TABLE 3 TEMPORALANDSPATIALVARIATIONSINSALINITY(PPT)
AT MID-CHANNEL OF THE COLORADO RIVER (JULY-SEPTEMBER, 1983) l E DEPTH (ft.)
Sampling Time Dates (CST) S 5 10 15 20 B (Depth) 14 July 1100 1.4 1.5 5.5 14.1 17.7 17.6 (21')
14 July 1720 1.3 1.3 3.4 12.0 13.3 15.9(22')
14 July 2300 1.0 1.0 3.1 9.7 15.1 15.5(21')
15 July 0845 0.4 0.5 0.6 6.8 12.1 13.6(21')
27 July 1300 0.3 0.3 0.3 0.5 -
0.7 (19')
6 27 July 1920 0.3 0.3 0.3 0.3 -
0.4(19')
l 28 July. 0120 0.3 0.3 0.3 0.3 -
0.9 (17')
28 July 0720 0.3 0.3 0.3 0.7 -
0.8 (16')
l l
9 August 1155 2.6 4.5 20.1 23.3 -
23.8 (18') I 9 August 1800 2.5 6.7 19.9 23.3 -
23.7 (19')
l
! 9 August 2330 2.6 9.1 20.7 23.0 23.2 23.2(20') '
10 August 0600 2.1 3.4 15.5 22.6 -
23.0(17')
15 September 1200 0.7 2.8 10.3 15.9 -
17.1(18')
15 September 1745 0.7 2.6 9.4 15.6 -
16.3 (17')
15 September 2330 1.5 1.7 4.1 15.5 -
16.0 (19') j l
l 16 September 0600 1.0 1.8 6.5 14.6 -
15.6 (18')
1 I
I
. I 17
I TABLE 4 TEMPORAL VARIATIONS IN SURFACE WATER QUALITY PARAMETERS I IN THE RMPF SILTATION BASIN (AUGUST-SEPTEMBER, 1983)
E Sampling Time Temperature Salinity Dissolved Dates (CST) ('C) (PPT) Oxygen (PPM) pH 9 August 1100 31.5 2.8 7.4 7.9 9 August 1640 30.0 2.7 7.8 8.1 9 August 2230 29.6 3.2 7.2 8.0 10 August 0450 29.4 2.4 6.3 7.8 ,
29.4 1.2 7.5 7.9 I 15 September 15 September 1100 1705 30.3 1.0 9.2 8.0 l 15 September 2250 30.1 1.6 8.1 8.1 16 September 0545 29.4 1.4 7.8 7.8 I
I I
E E
I I
I I
l . . -
18
TABLE 5 TEMPORAL VARIATIONS IN TEMPERATURE, CONDUCTIVITY, SALINITY, DISSOLVED OXYGEN AND pH AT THE STP REVOLVING SCREEMS (JULY - SEPTEMBER, 1983)
Conductivity pH Bottom Temperature ('C) (millimhos/cm) Salinity (ppt) DissolvedOxygen(ppm) Sur- Depth Surface Bottom Surface Bottom Surface Bottom Surface Bottom face (ft.)
Sampling Dates Time (CST) 27.5 27.5 4.6 6.0 2.5 3.3 6.5 5.2 7.4 4 13 July 1329 27.2 27.4 5.0 5.9 2.7 3.3 6.1 6.8 7.5 3 13 July 2100 26.6 26.8 3.5 3.9 1.7 2.1 6.1 6.1 7.4 3 14 July 0511 29.6 29.4 0.4 0.4 0.2 0.2 6.2 5.4 7.9 4 21 July 1315 29.4 29.8 0.4 0.4 0.2 0.2 6.6 6.1 7.9 7 21 July 2110 29.5 29.8 0.4 0.4 0.2 0.2 6.6 6.2 8.0 8 22 July 0505 32.9 32.1 0.6 0.6 0.3 0.3 8.9 8.7 7.8 8 m
27 July 1400
- 31.9 32.5 0.6 0.6 0.3 0.3 11.0 10.8 8.6 7 28 July 2230 31.6 32.0 0.6 0.7 0.3 0.4 9.2 8.9 8.1 9 28 July 0626 30.7 30.3 5.0 13.8 2.7 8.0 8.0 6.3 7.9 9 9 August 1300 29.7 30.2 6.2 12.2 3.4 7.0 7.5 7.1 8.0 6 9 August 2100 0500 29.4 29.6 4.4 5.8 2.3 3.2 7.0 5.8 7.9 5 10 August 30.1 29.4 1.6 4.0 0.8 2.3 8.1 6.7 8.2 7 15 September 1414 30.2 30.2 2.4 6.0 1.2 3.3 8.4 7.0 8.2 7 15 September 2205 29.3 29.8 2.3 5.2 1.1 2.8 7.6 6.3 8.0 9 16 Septeater 0615 l
I TABLE 6 AVERAGE COLORADO RIVER FLOW (CFS) ON DATES OF SAMPLE COLLECTION, JULY-SEPTEMBER, 1983 DATE RIVER FLOW 13 July 492 14 July 1023 15 July 3149 21 July I 22 July 2139 1676 4 27 July 713 28 July 825 9 August 637 10 August 2076 15 September 913 16 September 736 I
I I
I I
. I I
- Derived by taking arithmetic mean of 3 daily flow values recorded at the beginning of each shift 20
TABLE 7 RESERVOIR MAKEUP PUMPING FACILITY (RMPF)
DAILY PUMPAGE, IN CUBIC METERS, JULY-SEPTEMBER, 1983 DATE JULY _,
AUGUST SEPTEh8ER 1 85,617.24 94,388.08 0 2 0 85,617.24 0 l 3 4
0 0
64,030.99 293,005.59 0
0 5 0 200,283.40 0 6 0 278,758.67 0 160,540.03 0 I
7 0 8 0 146,120.41 36,696.63 9 0 311,409.41 176,871.57 10 0 873,071.30 327,185.88 11 88,676.32 1,674,340.57 464,314.07 l 12 13 84,988.15 100,591.93 1,761,499.68 1,761,499.68 667,841.57 733,969.51 14 319,846.55 1,761,499.68 733,969.51 15 396,607.26 1,761.499.68 733,969.51 691,376.75 1,466,409.47 554,569.27 I
16 ,
17 1,027,505.50 530,590.03 354,705.26 18 1,027,505.50 0 305.784.65 19 975,229.77 316,528.44 131,552.78 20 1,027,505.50 580,509.77 9,744.65 l 21 22 1,027,505.50 1,070,332.62 357,764.34 79,018.01 0
0 23 1,174,304.34 0 0 24 897,309.58 0 0 25 477,130.14 0 0 I 26 365,412.04 0 0 27 271.110.97 0 0 28 475,674.61 0 0 29 434,512.71 0 0 l 30 31 191,056.82 21,401.23 0
0 0
0 I Totals 12.231,201.03 14,558,384.47 5.231,174.86 21
M M M M M M M TABLE 8 MAca0200 PLANKTON A2 FISH TAIA COLLECTED IN THE COLORADO RIVER BY 0.5-se PLANKTON NET, JULY - SEPTEMBER 1983 14-15 JULY 27-28 JULY 9-10 AUGUST 15 - 16 S E P T E ll 5 E R Mid- Mid- Mid- Mid-TAIA Seface Depth Botta=* Obisque surface Depth Bottom chlique Surface Depth Bottom Obilgue surface Depth Bottom obileue OttaaRIA Jellyfish medussee I I I I I I I I ammsisaa (ettesimeste)
Deco foreste I
maart 184 (pelschmetei herold repreeactive form I I amm a tunca Pelecypede juvenile I I I I I I I I DIRE 1MMiten Seeftte sp. I I I I I I rvaanrren Leydfale ocenthocereeldes I Nelme beachEate I I I Isofaedophate secteeytt I I 55eecephalus e=spineous I I h seerulates I S wetulus 2 I I I MTaarman i
- UaIdontIfIed Ostracede I I I I
1 carecia i
Cepepede semplit I I I I
Acertie 14titeborget I I J
F I I I I I I I I I
$ teese I i
l j
m m M M M M M M M M M M M
=r . iCa t c 14-15 JULV 27-28 JULV 9-10 AUGUST 15 - 16 SEPTEMBER Mid- Mfd- Mid- Mid.
TAAA Serfece Depth Bettee* Mitgoe Seefece Depth Bottam MtIque hefece Depth Bottam obilem Seeface M 8ettam ObIIque CN EP M A (Cast'd)
Deeptease app. I I Cplepaide cepepedf de 3 I Crelops seemelle E teelievelept app. I Deselcyclops app. I I saecesevelope elbidos I W. stee I It feeces I Ineeervelops ede I E E X X E Cf.home g N Wtecendo espepedede I I I E Gb I E untdoettfled Cettgelde MW3H4An aegelse opp. I I I I I I I I I E E E CSMarED64 Sermoele esisp1tt I I I I E I I I E Bermacle cypets I I een areEMACA mws8 % fs opp. Jeweetles E I I I E I I 5 elmyre I I Co**phfe levistemian I I I I I I eavetelle artees 3 I reaseos artacus postlerees I I I I I L eettfeces postlersee I E I I meccone.e*i. .pp. asse. I I I a E I a I I 3 a I I I g ehtome E I I I Palewes opp. aseee I E I I I I b I"E e I E
I I . .. ... .. . .
E i.
as M as n M M es as as A
I w
88 M N M M 98 as pg M M M h
i - - -
I e 3
1 I
8
" 8 m . . . . .
4 8 m M w n M as M n se og MM M M I _
. so
=
=
=
' 3 y
33 . . . .
I
-1 - . . . .
s.
O
\
I i
MM M as se se se se I -
i M MM 8 .,
1 3 i 32 l5 : ~
a llI ..
!}8 .
I I L
!: 3-
! I5 1st I I : : 3 1J [ g ,'
1I}l's l '
l i j >
ii E!!$,$!!j{3 ! a 3
O a 3
,i dl 2
=e3 -ig .i C dl 6 .1 E a,AA
- , i .i .i 3 3 3 3 3
.l .l A
- g-i i
I
.i 24
E E E E E E E E E E E E IRE 9 NMot (PGt ED M) & N m t rnID DE Tlf CILGMD Rnst BY 0.54f RJteGIN IET DI 14-15 J1719E3 SURFACE MID-DEPTH BOTTOP 08LIQUE M MIOEEEE EEEE EEEE EEEE Jellyfish sedssae 72.2 142.2 36.7 79.9 91.1 176.1 63.3 192.7 Dero R.rtata 2.1 threid nsstective fors 2.3 Sarttta ssp. 9.8 4.2 10.1 te3digia acanthsemnkks 9.8 fetes tradia+J 2.0
- t'.e
- a naciegril 3.0 2.1 5 5tecephalus % : w 2.0 Lsemiatus 6.9 L wtuha 6.1 2.1 20.7 6.2 42.2 Ostracrzk (uddetified) 3.0 Acartia tersa 19.5 4.2 11.4 Dietrans ssp.
10.1 ftmocles albus 2.1 5agt 2.1 ifuscus 21.1
%ns so. 2.0 2.3 19.6 10.1
TMLE 9 (Qmt'd)
! SURFACE MID- DEPTH BOTTOM
- OBLIQUE l
M TDE (GT): MMMM gggg ggMM ggMM l
Bamacle napiti 13.7 50.9 9.8 j
Mrsidesis spp. juwniles 2.1 2.1 21.1 Quishium louistarun 13.8 2.1 l lbelellaazteca 2.1 6.2 21.1 i
- Penseus setifems postlanee 2.1 2.3 12.3 21.1 l Itcrobrechium spp. zoese 3.0 3.9 2.1 i
j 5chione 21.1 l c"n Callianassa ssp. zoese 101.9 200.0 73.7 19.6 42.2 10.1 l Calliarussa ssp. postlanee 64.4 39.0 2.1 i
i Calliictes sap 1&s juwniles 4.6 i
) Ihithrtseness terris11 zoeae 3.0 177.5 72.2 259.5 18.4 48.9 105.5 30.4 l
i l
1 1
i i
]
- No saples taken at the bottan on this &te
! de to loss of net on sdnerged debris i
l
TABL;.10 3
NUpeFR (PER 100 M ) 0F MACROZ00 PLANKTON COLLECTED IN THE COLORADO RIVER BY 0.5-M PLANKTON NET ON 27-28 JULY 1983 SURFACE MID- DEPTH BOTTOM OBLIQUE __
TARA TIME (CST): 1300 1920 0120 0720 1300 1920 C120 0720 1300 1920 0120 0720 1300 1920 0120 0720 i Molna brachtata 2.2 3.2 10.3 Ostracoda (unidentifted) 2.0 Copepoda naupill 2.8 2.0 16.8 42.7 23.5 Acartia tonsa 10.1 1
l Diantomus spp. 2.2 2.0 y Cy:1:poida copepodida 3.0 2.2 2.8 10.1 Cyclops vernatts 42.7
! Mesocyclops edan 3.0 2.2 2.0 6.4 10.3 l Harpactaccida copepodida 8.1 71.1 l Argulus spp. 9.9 10.0 5.5 2.2 2.0 9.6 20.4 i
j Mysidopsis spp. Juveniles 4.0 3.2 22.8 14.2 5 almyra 9.0 6.1 3.2
$ Coroph1um loutsIanum 2.2 11.7 i Macrobrachium spp. zoeae 2.2 10.1 3.2 ;
1 i
-M. ohtone 26.9 2.2 13.4 10.1 11.7 140.9 102.6 1
Palaemonetes spp. Zoeae 4.4 2.8 2.0 12.8 16.8 22.8 11.7 P. puqio 20.9 50.3 1
I i
M M M M M M
~
M . M M M M M M TABLE 10 (Cont'd) l SURFACE MID- DEPTH BOTTOM OBLIQUE TAKA TIME (CST): 1300 1920 0120 0720 1300 1920 0120 0720 1300 1920 0120 0720 1300 1920 _0120 0720 j Callianassa spp. zoeae 47.9 4.4 463.6 66.5 25.5 50.3 1252.9 554.8 23.4 164.3 71.8 Callinectes sapidus juventies 6.6 12.1 28.5 i Rhlthropanopeus harris 15 zoeae 19.9 19.7 140.8 57.9 179.2 98.8 194.7 184.6 205.0 455.2 233.9 93.9 61.5 171.5
- h harris 11 megalopa 2.2 2.0 33.6 28.5 l
co s
i i
i I
I 9
j
)
i i
TABLE 11 3
4 NUMBER (PER 100 M ) 0F MACF0 ZOOPLANKTON COLLECTED IN THE COLORADO RIVER BY 0.5-M PLANKTON NET ON 9-10 AUGUST 1983 SURFACE MID-DEPTH BOTTOM OBLIQUE TAIA TIME (CST): 1155 1800 2330 0600 1155 1800 2330 0600' 1155 1800 2330 0600 1155 1800 2330 0600 Jellyfish medussae 2.5 2.6 10.2 13.8 3.1 3.2 21.3 Pelecypoda juveniles 11.9 2.8 44.4 13.8 3.1 9.5 11.8 Sagitta spp. 2.6
- Ostracoda (unidentified) 2.5 Acartta tonsa 2.9 7.7 10.2 5.9 Argulus spp. 3.0 2.6 19.8 11.5 5.9 Barnacle nauplii 2.7 249.3 23.0 20.7 23.0 17.8
$ Barnacle cypris 3.2 Mysidopsis spp. juveniles 2.8 5 almyra 64.2 2.6 Penaeus settferus postlarvee 17.9 54.3 2.6 Macrobrachium spp. zoeae 3.0 12.8 10.2 M 2 ohione 2.8 i
Callianassa spp. zoeae 85.6 16.3 175.2 120.2 30.6 12.4 262.5 34.5 53.3 Callianassa spp. postlarvae 13.8 2.7 l h jamaicense 7.4 3.1 Callinectes spp. megalopa 17.9 2.9 19.7 23.0 C 6.2 11.5 2 sapidus juveniles 3.0 14.8
. Rhithropanopeus harris 11 zoeae 14.2 21.0 92.4 847.8 1960.2 1153.6 2458.1 4831.2 71.5 130.9 9.3 183.4 2680.9 119.1 942.5 3493.2 t
TABLE 12 3
NUMBER (PER 100 M ) 0F MACR 0 ZOOPLANKTON COLLECTED IN THE COLORA00 RIVER 8Y 0.5-M PLANKTON NET ON 15-16 SEPTEleER 1983 SURFACE MID - DEPTH 80TTOM 08LIQUE TAXA TIME (CST): 1200 1745 2330 0600 1200 1745 2330 0600 1200 1745 2330 0600 1200 1745 2330 0600 Jellyfish medussae 15.2 12.1 32.8 5.5 3.9 23.9 Nereid reproductive form 1.9 Pelecypoda juveniles 8.8 15.2 1.9 4.7 1.5 8.2 16.b 3.9 8.9 47.9 5.3 Sagitta spp. 8.8 15.2 13.2 2.3 18.1 13.7 11.0 7.8 95.7 13.7 Simocephalus exspinosus 2.6 Acartia lilljeborget 1.9 1.5
& tonsa 17.7 12.7 7.5 12.1 3.9 8.9 w
Halicyclops spp. 15.9 Hem 1 cyclops spp. 16.5 8.2 Ofthona spp. 2.5 15.5 Harpactaco'da copepodida 2.9 10.9 15.9 Caligoida (unidentified) 4.7 5.3 Argulus spp. 10.9 3.8 7.0 1.5 5.3 Barnacle nauplii 22.8 3.8 2.3 5.5 5.5 5.3 Barnacle cypris 8.9 Mysidopsis spp. Juveniles 2.5 M2 almyra 15.1 8.2 22.0 3.9
TABLE 12 (Cont'd)
SURFACE MID - DEPTH BOTTOM 08LIQUE 1200 1745 2330 0600 1200 1745 2330 0600 1200 1745 2330 0600 TAIA TIME (CST): 1200 1745 2330 0600 Corophium louisianum 1.9 3.9 4
Penaeus aztecus postlarvae 1.9
)
i 8.2 35.7 8.2 11.0 10.6 P
2 setiferus postlarvae 5.4 5.6 5.3 Macrobrachium spp. zoeae 11.3 5.5 15.9 j M 2 ohione 2.2 3.8 6.0 5.5 7.8 8.9 5.3 Palaemonetes spp. zoeae 22.1 99.0 26.3 2.3 61.9 84.6 38.5 46.6 167.5 10.6 Callianassa spp. zoeae 2.2 2.5 5.6 3.0 5.5 7.8 23.9 10.6 Callianassa spp. postlarvae i
g L jamaicense 1.9 Petrolisthes armatus zoeae 6.6 2.5 2.3 7.6 5.5 Callinectes sapidus juveniles 7.5 i
Rhithropanopeus harristi zoeae 20.1 20.3 32.6 358.0 10311.5 9091.4 10953.6 2994.7 3077.5 1623.9 291.2 889.3 4701.7 17248.8 2343.3 604.4 2.7 7.7 7.5 15.9 R harristi megalopa i Pinnixa spp. zoeae 2.7 l
I i
e l
I I
TABLE 13 I LIST OF FISH TAXA COLLECTED IN 0.5-M PLANKTON NET SAMPLES FROMTHECOLORADORIVER(C.R.)ANDTHESILTATIONBASIN(S.B.),
JULY - SEPTEMBER, 1983
~
COMMON NAME SCIENTIFIC NAME LOCATION OF COLLECTION Bay anchovy Anchoa mitchilli C.R., S.B.
Mosquitoffsh Gambusia affinis S.B.
Pipefish (juvenile) Syngnathus sp. C.R.
i Crevalle jack .Caranx hippos C.R.
Gobies (larvae) Fam. Gobiidae C.R.
Darter goby Gobionellus boleosoma C.R.
Sharptail goby L hastatus C.R.
Naked goby Gobiosoma bosci C.R.
l Code goby C.R.
E robustum Unidentified fish eggs --- C.R.
Unidentified larvae --- C.R.
I I
'I
- I I
I l 32
W M M M M 'M M M M M M M M M M M M :
I
! TABLE 14 3
l NUMBER (PER 100 M ) 0F ICHTHYOPLANKTON COLLECTED IN THE COLORADO RIVER BY 0.5-M PLANKTON NET ON 14-15 JULY 1983 5
TAXA SURFACE MID- DEPTH B O T T O M* OBLIQUE TIME (CST): 1100 1720 2300 0845 1100 1720 2300 0845 1100 1720 2300 0845 1100 1720 2300 0845 Anchoa mitchilli 21.1 Caranx hippos 21.1 Gobildae(unidentified) 2.1 Gobiosoma bosci 3.9 2.1 Fish eggs 5.7 3.0 8.2 10.1 l Unidentified larvae 2.9 9.2 4.1 i
$ N i
i i
l l
i 1
- No bottom samples collected on this date l due to loss of net on submerged debris 1
i
E E E E E E E E E E E E E E E E E TABLE 15 i 3 NUMBER (PER 100 M ) 0F ICHTHY 0 PLANKTON COLLECTED IN THE COLORADO RIVER BY 0.5-M PLANKTON NET ON 27-28 JULY 1983 TAXA SURFACE MIO- DEPTH B0TT0M 08LIQUE TIME (CST): 1300 1920 0120 0720 1300 1920 0120 0720 1300 1920 0120 0720 1300 1920 0120 0720 I
Anchoa mitch1111 167.5 238.8 5.5 201.6 373.0 3.0 597.4 269.0 188.0 492.3 I
Syngnathus sp. 3.0 l
Gobionellus boleosoma 23.5 i
l Gobiosoma bosci 4.5 4.0 10.3 l G. robustum 2.0
, Unidentified larvae 2.8 i
to e
5 i
i t
4 I
i
TABLE 16 3
NUMBER (PER 100 M ) 0F ICHTHYOPLANKTON COLLECTED IN THE COLORADO RIVER BY 0.5-M PLANKTON NET ON 9-10 AUGUST 1983 TAXA SURFACE MID- DEPTH B0TTOM OBLIQUE i
TIME (CST): 1155 1800 2330 0600 1155 1800 2330 0600 1155 1800 2330 0600 1155 1800 2330 0600 Anchoa attchtilt 6.0 2.5 Gobionellus boleosoma 9.9 3.1 G hastatus 7.4 15.5 l Gobiosoma bosci 4.9 I
i i
u, i
l I
I I
i l
4 l
l
)
i 4
TABLE 17 3
NUMBER (PER 100 H ) 0F ICHTHYOPLANKTON COLLECTED IN THE COLORADO RIVER BY 0.5-M PLANKTON NET ON 15-16 SEPTEMBER 1983 TAXA SURFACE MID- 0EPTH B0TT0M 08LIQUE TIME (CST): 1200 1745 2330 0600 1200 1745 2330 0600 1200 1745 2330 0600 1200 1745 2330 0600 Anchoa mitchilli 7.5 2.7 5.3 Syngnathus sp. 2.6 Gobildae(unidentified) 6.6 16.9 4.7 1.5 5.3 Gobionellus boleosoma 33.9 33.0 42.5 G. hastatus 8.2 Gobiosoma bosci 2.5 5.6
$ Unidentified larvae 5.3 e
l I
i l
l
.I l
TABLE 18
)
3 NUMBER (PER 100 M ) 0F MACR 0 ZOOPLANKTON AND ICHTHYOPLANKTON COLLECTED I IN THE SILTATION BASIN BY 0.5-M PLANKTON NET ON 9-10 AUGUST 1983 I TAXA TIME (CST) 1100 1640 2230 0450 Neanthes succinea 10.3 Pelecypoda juveniles 10.3 ;
Argulus spp. 12.4 iI Penaeus setiferus postlarvae 12.4 209.8 Macrobrachium ohione 323.1 149.1 20.5 116.6 i Rhithropanopeus harrisii zoeae 48.5 12.4 30.8 93.2 Callinectes spp. megalopa 40.4 51.3 23.3 l
L sapidus juveniles 16.2 46.6
! Anchoa mitchilli 51.3 l Gambusia affinis 23.3 i
lI I
I lI l
I I
I 37
I TABLE 19 3
NUMBER (PER 100 M ) 0F MACR 0Z00 PLANKTON AND ICHTHYOPLANKTON COLLECTED !
IN THE SILTATION BASIN BY 0.5-M PLANKTON NET ON 15-16 SEPTEMBER 1983 I TAXA TIME (CST) 1100* 1705 2250 0545 Polychaeta larvae 14.1 Pelecypoda juveniles 28.3 Halicyclops spp. 42.4 Oithona spp. 14.1 Penaeus setiferus postlarvae 15.5 283.2 14.1 Macrobrachium chione 14.9 14.1 Palaemonetes paludosus 14.9 Rhithropanopeus harrisii zoeae 309.1 685.5 466.8 I Callinectes sapidus juveniles 14.1 Gambusia affinis 14.9 I l 5 )
I I ,
I I
I l I
I )
1 I *No organisms in sample 38
p.
I TABLE 20 MACR 0 INVERTEBRATE AND FISH TAXA COLLECTED IN THE COLORADO RIVER BY TRAWL, SEINE AND REVOLVING SCREENS, JULY - SEPTEMBER 1983 I TAXA TRAWL SEINE REVOLVING SCREENS Penaeus aztecus X Penaeus setiferus X X X Trachypeneus constrictus X Palaemonidae sp. X Palaemonetes kadiakensis X Palaemonetes paludosus X X X Macrobrachium ohione X X X Callinectes sapidus X X X Rhithropanopeus harrisii X Procambarus blandingi acutus X Lepisosteus oculatus X X Brevoortia patronus X X l
Dorosoma cepedianum X Anchoa mitchilli X X l
I Ictalurus furcatus X l
Arius felis X Bagre marinus X Gambusia affinis X Poecilia latipinna X Menidia beryllina X X Lepomis cyane11us X I
39 I
- n. ,- - ~ . --
, . - , - , , - , - - - - - - - , - , - - . . - , - - , . , , - , , . - - . c .- - - -.,-,n, -- - , --.-- -.-- _ - ---
lI TABLE 20(cont'd)
I TRAWL SEINE REVOLVING SCREENS TAXA Caranx hippos X X Eucinostomus argenteus X Eucinostomus lefroyi X Archosargus probatocephalus X Lagodon rhomboides X Bairdiella chrysoura X Cynoscion arenarius X X
,Leiostomus xanthurus X X Micropogonias undulatus X Mugil cephalus X Dormitator maculatus X Evorthodus lyricus X Gobiosoma bosci X Gobionellus boleosoma X X Gobionellus shufeldti X Gobioides broussonetti X Citharichthys spilopterus X X Paralichthys lethostigma X X Achirus lineatus X I
I I
40
TABLE 21 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTil (simi) 0F MACROINVERTEDRATES AND FISH COLLECTED IN THE COLORADO RIVER BY TRAWL ON 14 - 15 JULY 1983 a b TIME (CST): 1100 1720' 2300 0845 TAXA No. Wt. L. No. Wt. L. No. Wt. L. No. Wt. L.
Anchoa altchilli 4 2.2 33.2 Arius felis 26 1376.0 141.7 Cynoscion arenarius 5 9.9 43.4 Micropogonias undulatus 26 130.2 58.1 S
- No trawls completed because of snags b
Trawl completed, no organisms caught l
I 4
l
TABtE 22 TOTAL NUMBER, TOTAL WEIGHT (g) ANO MEAN LENG1H (mm) 0F MACR 0 INVERTEBRATES ANO FISH COLLECTE0 IN THE COLORADO RIVER 8Y TRAWL ON 27 - 28 JULY 1983 0720 TIME (CST): 1300 1920 0120 TAXA No. Wt. L. No. Wt. L. No. Wt. L. No. Wt. L.
Penaeus settferus 14 23.9 58.1 6 7.5 49.8 3 1.3 34.7 25 33.3 52.4 Palaemonetes paludosus 1 0.1 -
1 0.1 -
Macrobrachium Ohione 478 163.0 - 53 69.0 -
20 18.3 -
196 168.2 -
Callinectes sapidus 47 95.4 13.1 98 43.4 11.8 93 107.7 12.1 26 60.8 13.8 Rhithropanopeus harrisil 1 0.2 -
Lepisosteus oculatus 1 850.5 505.0 1 1105.6 530.0 Brevoortia patror.us 2 12.4 67.0 1 4.3 57.0 Oorosoma cepedianum 1 7.1 75.0 1 2.8 56.0 Anchoa mitchillt 245 77.9 29.0 1561 196.6 21.1 1000 115.3 20.9 806 192.6 26.4 Ictalurus furcatus 8 1261.6 207.5 2 81.4 9.6 1 47.3 146,0 Arius felis 1 141.7 195.0 2 142.2 157.5 Bagre marinus 2 16.5 76.0 1 10.5 84.0 1 5.2 68.0 8airdiella chrysoura 1 113.4 155.0 Cynoscion arenarius 9 38.2 56.6 5 13.8 46.8 4 24.3 58.7 Micropogonias undulatus 2 175.3 129.0 2 143.3 125.0 2 151.8 129.0 Gobiosoma bosci 2 0.4 20.5 boblonellus boleosoma 2 0.9 30.0 3 0.7 23.0 4 1.2 25.7 1 0.2 24.0
l l
l TABLE 22 (cont'd)
- TIME (CST): 1300 1920 0120 0720 i TAXA No. Wt. L. No. Wt. L. No. Wt. L. No. Wt. L.
Gobioides broussonetti 1 0.1 25.0 j Citharichthys spliopterus 7 5.0 34.4 1 0.1 13.0 1 1.9 51.0 6 5.4 38.5 i
Paralichthys lethostigma 2 183.1 165.0 2 236.0 903.9 Achirus lineatus 1 0.3 21.0 1 0.1 13.0 1 0.1 18.0 I
4 i
f l
l i a i
i 1
l l
l T
I i
I i
W W W M M M 'M M 4 W W W W W W W W .W M l
TABLE 23 J
TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (nun) 0F MACROINVERTEBRATES AND FISif COLLECTED IN THE COLORADO RIVER BY TRAWL ON 9 - 10 AUGUST 1983 a 2300 0600 TIME (CST): 1155 1800 l TAXA No. Wt. L. No. Wt. L. No. Wt. L. No. Wt. L.
k Ictalurus furcatus 1 93.4 178.0 2 247.3 197.0 Arius felis 1 165.4 214.0 1 65.5 '152.0 i
Bagre marinus 1 14.2 96.0 1 7.9 77.0 i
', "No organisms caught i
h 4
1 i
i l
1
W m m M M M e m W W W NW W W W W W W '
TABLE 24 TOTAL NUMBER, TOTAL WElGHT (g) AND MEAN LENGTH (m) 0F MACROINVERTEBRATES AND FISH COLLECTED IN THE COLORADO RIVER BY TRAWL ON 15 - 16 SEPTEMBER 1983 1200 1745 2330 0600 TIME (CST):
TAXA No. Wt. L. No. Wt. L. No. Wt. L. No. Wt. L.
Penaeus settferus 1 5.3 95.0 60 34.4 43.9 16 18.2 47.3 Trachypeneus constrictus 1 0.1 23.0 Anchoa mitchilli 1 0.1 19.0 letalurus furcatus 1 111.7 192.0 Arius felis 1 35.9 125.0 3 266.6 170.3 1 260.0 248.0 4 318.7 157.0 Bagre marinus 1 22.4 108.0 2 45.4 109.5 un Lagodon rnomboides 2 35.7 82.5 Cynoscion arenarius 1 0.1 13.0 5 52.1 79.0 Leiostomus xanthurus 11 169.5 80.0 1 10.8 73.0 1 18.6 90.0 5 79.1 82.6 Micropogonias undulatus 3 79.8 103.0 2 184.6 143.5 4 88.7 102.2 l
d l
l l
M M M M M M M M M M M M M M M. M M M M I
TABLE 25 TOTAL NUISER TOTAL WElGHT (g) AND MEAN LENGTH (mm) 0F MACROINVERTEBRATES AND FISH COLLECTED IN THE COLORADO RIVER l
BY SEINE ON 14 - 15 JULY 1983 1100 1720 2300 0845
, TIME (CST):
TAXA No. Wt. L. No. Wt. L. No. Wt. L. No. Wt. L.
l Penaeus artecus 1 4.3 -
5.3 44.1 19 11.7 38.6 24 17.5 39.1 8 8.0 47.0 Penaeus settferus 7 4
Macrobrachium ohtone 4 3.8 -
Callinectes sapidus 2 0.8 16.5 2 119.2 69.5 10 1.4 11.3 1 0.7 18.0 i
Procambarus blandingi acutus 1 2.8 -
i 1
! Lepisosteus oculatus 2 1757.7 475.0 2 992.2 423.5 i
Brevoortia patronus 2 1.5 33.5 2 1.6 35.0 12 27.7 44.2 Anchoa mitchtill 2 0.3 24.5 Poecilla latipinna 1 1.4 32.0 Menidia beryllina 1 1.4 45.0 1 0.4 31.0 Caranx hippos 10 7.1 27.2 2 1.6 28.5 Eucinostomus lefroyi 1 0.2 18.0 1 0.2 18.0 Cynoscion arenarius 1 0.6 32.0 3 3.2 37.3 2 1.3 30.5 Mugil cephalus 36 79.0 39.5 1 0.7 30.0 4 22.2 55.0 7 206.5 78.1 Dormitator maculatus 19 15'.2 30.3 1 2.3 44.0 GoblonellJs boleosoma 2 0.8 27.5 5 1.8 25.8 Goblonellus shufeldti 1 1.4 42.0 Citharichthys spilopteries 2 1.0 30.0 14 8.1 30.9 1 0.3 27.0 Paralichthys lethostigma 2 1048.9 288.0
TABLE 26 TOTAL NUleER, TOTAL WEIGHT (g) AND MEAN LENGTH (m) 0F MACROINVERTEBRATES AND FISH COLLECTE0 IN THE COLORADO RIVER BY SEINE ON 27 - 28 JULY 1983 a a 1920 0120 0720 TIME (CST): 1300 L. No. Wt. L. No. Wt. L. No. Wt. L.
TAXA No. Wt.
Palaemonetes paludosus_ 1 0.3 -
Macrobrachium ohtone 42 27.9 -
Callinectes sapidus 38 23.4 12.6 44 31.6 13.5 Brevoortia patronus 7 4.2 28.9 3 2.2 38.0 64 13.8 25.6 Anchoa mitch1111 Gambusia affinis 1 0.4 23.0 0
Poecilia latipinna 1 0.7 29.0 Archosargus probatocephalus 1 69.5 115.0 Evorthodus lyricus 2 2.0 34.0 Goblonellus boleosoma 10 2.8 24,9 3 1.0 24.3 Goblone11 tis shufeldti 1 1.7 44.0 Citharichthys spilopterus 13 5.8 27.7 22 12.4 31.8 l
l 4
aNo collection due to slit clogging net l
2 TABLE 27 TOTAL NUMBER, TOTAL WElGHT (g) AND MEAN LENGTil (mm) 0F MACR 0 INVERTEBRATES AND FISH COLLECTED IN THE COLORADO RIVER BY SEINE GN 9 - 10 AUGUST 1983 a a a TIME (CST): 1155 1800 2300 0600 TAXA No. Wt. L. No. Wt. L. No. Wt. L. No. Wt. L.
Penaeus settferus 27 24.4 43.9 I
Macrobrachium ohlone 1 1.2 -
Callinectes sapidus 7 0.7 11.0 Anchoa altchilli 4 0.4 20.8 3
i Cynoscion arenarius 2 0.6 23.0 4
g; Musil cephalus 1 3.0 47.0
. Gobionelius bolesoma 16 4.7 24.6 Citharichthys spilopterus 5 4.4 36.6 l
t
- No collection due to silt clogging net l
i i
i
TABLE 28 TOTnt NUMBER TOTAL WEIGHT (g) AND MEAN LENGTH (nm) 0F MACR 0lHVERTEBRATES AND FISH COLLECTED IN THE COLORADO RIVER BY SEINE ON 25 - 16 SEPTEMBER 1983 TIME (CST): 1200 1745 2330 0600 TAXA !io . Wt. L. No. Wt. L. No. Wt. L. No. Wt. L.
i, i Penaeus settferus 88 65.1 47.6 222 55.7 32.0 221 40.7 27.2 36 37.0 50.6 i
Palaemonetes paludosus 1 0.1 -
Macrobrachium oblone 5 2.9 -
Callinectes sapidus 5 1.8 15.0 1 0.1 13.0 Brevoortia patronus 6 11.5 43.5
) $ Menidia beryllina 2 1.7 40.0 2 1.3 37.5 3 1.5 36.7 Caranx hippos 1 1.9 44.0
! Eucinostomus argenteus 1 2.4 45.0 1 0.4 25.0 1
Cynoscion arenarius 1 1.5 51.0 Leiostomus xanthurus 1 27.1 98.0
- Mugli cephalus 10 933.5 107.1 3 26.2 69.0 6 56.5 74.2 Goblonellus boleosoma 6 2.4 28.2 i
Citharichthys spilopterus 8 7.2 34.4 2 4.4 51.5 i
I l
1
TABLE 29 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (mm) 0F MACROINVERTEBRA1ES AND FISH IMPINGE 0 ON 2 INTAKE SCREENS IN 30 MINUTES ON 13 - 14 JULY 1983 TIME (CST): 1329 2100 0511 TAXA No. Wt. 8. . No. Wt. L. No. Wt. L.
Palaemonetes paludosus 1 0.1 -
Macrobrachium ohione 21 1.7 -
Callinectes sapidus 10 1.4 12.4 3 1.3 19.0 42 3.2 9.2 Caranx hippos 1 0.6 27.0 E
TABLE 30 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (mm) 0F MACR 0 INVERTEBRATES AND FISH IMPINGED ON 2 INTAKE SCREENS IN 30 MINUTES ON 21 - 22 JULY 1983 TIME (CST): 1315 2110 0505 TAXA No. Wt. L. No. Wt. L. No. Wt. L.
Palaemonetes paludosus 2 0.4 -
2 0.6 -
5 1.2 -
Macrobrachium Ohione 1 0.1 -
3- 0.4 -
Callinectes sapidus 1 0.1 10.0 3 1.3 17.0 2 0.4 17.0 Menidia beryllina 1 0.6 37.0 Lepomis cyane11us 1 1.2 32.0
W M M M M M M M M M M M M M M W M TABLE 31 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (mm) 0F MACR 0 INVERTEBRATES AND FISH IMPINGED ON 2 INTAKE SCREENS IN 30 MINUTES ON 27 - 28 JULY 1983 TIME (CST): 1400 2230 0626 TAXA No. Wt. L. No. Wt. L. No. Wt. L.
Palaemonetes kadiakensis 1 0.3 -
Palaemonetes paludosus 2 0.6 - 2 0.4 -
Palaemonidae sp. 2 0.3 -
Macrobrachium ohione 2 0.6 -
1 0.1 -
Callinectes sapidus 3 0.4 13.0 4 16.7 23.5 3 0.8 14.7 TABLE 32 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (mm) 0F MACR 0 INVERTEBRATES AND FISH IMPINGED ON 2 INTAKE SCREENS IN 30 MINUTES ON 9 - 10 AUGUST 1983 TIME (CST): 1300 2100 0500 TAXA No. Wt. L. No. Wt. L. No. Wt. L.
Penaeus setiferus 3 2.9 47.0 Palaemonetes kadiakensis 1 0.1 -
Palaemonetes paludosus 1 0.2 -
Macrobrachium ohione 1 0.1 -
1 0.1 -
2 0.6 -
Callinectes sapidus 29 18.6 12.5 11 1.2 11.6 4 35.6 55.7
! TABLE 33 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (mm) 0F MACR 0 INVERTEBRATES AND FISH IMPINGED ON 2 INTAKE SCREENS IN 30 MINUTES ON 15 - 16 SEPTEMBER 1983 TIME (CST): 1414 2205 0615 TAXA No. Wt. L. No. Wt. L. No. Wt. L.
- Penaeus setiferus 1 0.1 25.0 2 0.4 28.0 10 3.8 35.7 Macrobrachium ohione 1 0.2 -
- Callinectes sapidus 2 0.6 18.0 2 0.3 11.5 i
l l
N I
i I
l l
t l