ML20138M130
| ML20138M130 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 12/31/1985 |
| From: | Baker W, Greene G, Mcaden D HOUSTON LIGHTING & POWER CO. |
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!; i SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION REPORT #3 COLORADO RIVER ENTRAINMENT AND IMPINGEMENT MONITORING PROGRAM PHASE TWO STUDIES JULY - SEPTEMBER,1985 l
f DECEMBER,1985 if A OC 0
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REPORT #3 COLORADO RIVER ENTRAINMENT AND IMPINGEMENT MONITORING PROGRAM 4
PHASE TWO STUDIES JULY-SEPTEMBER, 1985 PREPARED FOR SOUTH TEXAS PROJECT SUBMITTED BY ECOLOGY DIVISION, ENVIRONMENTAL PROTECTION DEPARTMENT I
HOUSTON LIGHTING & POWER COMPANY DECEMBER 1985 l
PREPARED BY: WILLIAM B. BAKER, JR., DAVID C. McADEN, GEORGE N. GREENE l
TABLE OF CONTENTS PAGE L
LIST OF TABLES.
1 INTRODUCTION.
1 METHODS 1
RESULTS AND DISCUSSION.
2 HYDROLOGY AND WATER QUALITY 2
MACROZ00 PLANKTON AND FISH.,
3 NEKTON 5
REFERENCES CITED.
7 i
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LIST OF TABLES TABLE PAGE 1 TEMPORAL VARIATIONS IN TEMPERATURE, TURBIDITY, pH AND DISSOLVED OXYGEN AT MID-CHANNEL OF THE COLORADO RIVER, SEPTEMBER 1985
.8 2 TEMPORAL AND SPATIAL VARIATIONS IN CONDUCTIVITY (MILLIMHOS/CM)
AT MID-CHANNEL OF THE COLORADO RIVER, SEPTEMBER 1985.........
9 3 TEMPORAL AND SPATIAL VARIATIONS IN SALINITY (PPT) AT MID-CHANNEL OF THE COLORADO RIVER, SEPTEMBER 1985 10 4 TEMPORAL VARIATIONS IN SURFACE WATER QUALITY PARAMETERS IN THE RMPF PIPELINE BASIN SEPTEMBER 1985 11 5 TEMPORAL AND SPATIAL VARIATIONS IN TEMPERATURE, CONDUCTIVITY, SALINITY, DISSOLVED OXYGEN AND pH AT THE STP REVOLVING SCREENS 12 SEPTEMBER 1985 6 AVERAGE COLORADO RIVER FLOW (CFS) ON DATES OF SAMPLE COLLECTION, SEPTEMBER 1985.............
13 7 RESERVOIR MAKEUP PUMPING FACILITY (RMPF) DAILY PUMPAGE, IN JULY-SEPTEMBER, 1985 14 8 MACROZ00 PLANKTON AND FISH TAXA COLLECTED FROM THE COLORADO RIVER AND THE RMPF PIPELINE BY 0.5-MM MESH PLANKTON NET, 4-5 AND 17-18 SEPTEMBER 1985 15 9 NUMBER (PER 100 M ) 0F bMCROZ00 PLANKTON AND FISH COLLECTED IN THE COLORADO RIVER BY 0.5-M PLANKTON NET ON 4-5 SEPTEMBER 1985..
17 10 NUMBER (PER 100 M ) 0F MACROZ00 PLANKTON AND FISH COLLECTED IN THE COLORADO RIVER BY 0.5-M PLANKTON NET ON 17-18 SEPTEMBER 1985.
19 11 NUMBER (PER 100 M ) OF MACROZ00 PLANKTON AND FISH COLLECTED IN THE RMPF PIPELINE BY 0.5-MM MESH PLANKTON NET ON 4-5 SEPTEMBER 1985 20 12 NUMBER (PER 100 M ) 0F MACROZ00 PLANKTON AND FISH COLLECTED FROM THE RMPF PIPELINE BY 0.5-MM MESH PLANKTON NET ON 17-18 SEPTEMBER 1985..
21 13 NEKTON COLLECTED IN THE COLORADO RIVER BY TRAWL, SEINE AND REVOLVING SCREENS, 4-5 AND 17-18 SEPTEMBER 1985.........
22 14 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (mm) 0F NEKTON COLLECTED IN THE C010RADO RIVER BY SEINE ON 4-5 SEPTEMBER 1985 23 i
LIST OF TABLES (Cont'd) 15 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (mm) 0F NEKTON COLLECTED IN THE COLORADO RIVER BY SEINE ON 17-18 SEPTEMBER 1985
. 24 16 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (mm) 0F NEKTON IMPINGED ON 2 INTAKE SCREENS IN 30 MINUTES ON 4-5 SEPTEMBER 1985
. 25 17 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (mm) 0F NEKTON IMPINCED ON 2 INTAKE SCREENS IN 30 MINUTES ON 11-12 SEPTEMBER 1985
. 26 18 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (mm) 0F NEKTON IMPINGED ON 2 INTAKE SCREENS IN 30 MINUTES ON 17-18 SEPTEMBER 1985
. 27 11
INTRODUCTION Section 6.1.3.2. and Appendix E of the Final Environmental Statement (USNRC 197$) require Phase Two of the dquatic ecology studies to begin within one week of the start of reservoir fill pumping. Report #1 (McAden et al.
1984) covered the period July 1983 - June 1984, Report #2 (McAden et al.1985) covered the period July - December 1984. No sustained reservoir filling occurred from January to August 1985.
Sustained reservoir filling resumed in September 1985. This report presents data for the sampling period July -
September 1985, during which time three entrainment samples and two impingement samples were collected.
METHODS Methods employed in impingement sampling of the RMPF screens and entrainment sampling in the Colorado River are described in Report #1 (McAden et al. 1984).
However, modifications of entrainment sampling procedures were necessary te overcome physical problems associated with sampling in the siltation basin and to improve the reliability of the samples collected (Wisenburg 1985). To accomplish this, a 4-in tap-line was installed on each of the two 108-in reservoir-fill pipelines, and a two-cubic-meter capacity metal tank was located adjacent to these outlets. Prior to each sample collection, the flow rate through the chosen 4-in sample hose was determined by measuring the time required to fill the tank. To collect samples, a 0.5-mm mesh plankton net was 1
suspended inside the tank with the cod end extending to the bottom of the tank and the net mouth held several inches above the water's surface. Water from one of the two 4-in tap lines was directed into the plankton net for 5 minutes. The net was then removed from the tank and rinsed from the outside to concentrate all of the sample in the cod end jar. Samples were then poured into a labelled plastic jar, preserved in 10% buffered formalin and stained with rose bengal. Samples were collected from only one pipeline during each collection. Samples were collected from the pipeline with the greatest flow; or, if the flow was equal, selection was random.
RESULTS AND DISCUSSION HYDROLOGY AND WATER QUALITY Water temperature, pH, turbidity and dissolved oxygen data from the Colorado River station are shown in Table 1.
Conductivity values are given in Table 2, and salinity values are given in Table 3.
Water temperature, salinity, dissolved oxygen and pH from the Reservoir Makeup Pumping Facility (RMPF) pipeline are given in Table 4.
Water temperature, conductivity, salinity, dissolved oxygen and pH data from the RMPF revolving screens are given in Table 5.
On both 4-5 and 17-18 September 1985 a wedge of salt water was present in the Colorado River at the RMPF, and extended within 5 to 10 ft of the surface.
The salt water wedge was low in dissolved oxygen on both trips (maximum of 0.9 ppm).
2
1 Water quality in the RMPF pipeline and at the revolving screens was similar to surface conditions in the Colorado River on both dates. This indicates that water being drawn in by the RMPF pumps is from near-surface waters of the Colorado River.
MACR 0 ZOOPLANKTON AND FISH During September 1985, 22 taxa of invertebrates and 7 taxa of vertebrates were collected in the Colorado River, while 8 invertebrate and 4 vertebrate taxa were collected from the RMPF pipeline (Table 8).
Tables 9 and 10, which show the spatial and temporal variations in density of both invertebrates and fish in the Colorado River, reveal that mid-depth and oblique tows yielded the largest number of taxa and the highest densities of plankton. The low densities of 0.'ankton in the bottom samples can be attributed to low dissolved oxygen levels on the bottom on both dates (Table 1).
Rhithropanopeus harrisii zoeae was both the most commonly collected and the most abundant invertebrate taxon, with the fish louse, Argulus spp., being present in small numbers in most samples. Penseid shrimp, Penaeus aztecus and P, setiferus, and the blue crab, Callinectes sapidus, occurred in small numbers in samples from the river.
Fish were not a major component of the plankton during this sampling period. The bay anchovy, Anchoa mitchilli, was found in 3 of the 32 plankton 3
samples collected. Two samples each contained a single larval pipefish, Syngnathus spp.
9 Tables 11 and 12 show the numbers of macrozooplankton and fish which were taken in samples from the RMPF pipelines on 4-5 and 17-18 September 1985. The dominant species in these samples were juvenile stages of the river shrimps, Macrobrachium acanthurus and M. ohione, and the glaucathoe stage of hermit crabs (Paguridea). Species of commercial importance, P. aztecus and C.
sapidus, were taken only sporadically and in low densities. The mud crab, R_. harrisii, which was dominant in river samples, was of secondary importance in entrainment' samples. Likewise, Argulus spp. were rarely taken in entrainment samples although they were common in river samples.
3 Fish were rarely taken in samples from the RMPF pipelines. In the 8
=
samples collected, only 2 species of fish and one unidentified fish larva were f
collected. On 5 September, one Gobiosoma bosci and one unidentified fish larva were collected. On 18 September, one Gambusia affinis was collected.
On both occasions, the fish were collected in the early morning samples (0450 and 0115 CST).
Data collected on these two sampling trips, though limited, indicate that those taxa which dominate samples from the river are of relatively minor importance in samples from the RMPF pipelines. For example, zoeae of the estuarine mud crab, R. harrisii, are the dominant organism in the river samples, but only secondary in importance in the RMPF pipeline samples.
However, the river shrimps, Macrobrachium spp., and hermit crabs, Paguridea, 4
which are generally absent in river samples, occur in large numbers in samples from the RMPF pipelines.
NEKTON Twenty-six species of macroinvertebrates and fish were caught in the seine and impingement samples (Table 13). No organisms were caught in the trawl samples because of the anaerobic conditions on the bottom (Table 1).
Four species of macroinvertebrates, 3 species of shrimp and 1 crab, were caught in the seine samples (Tables 14 and 15). The river shrimp, M. acanthurus, was the only fresh water representative, while the most abundant invertebrate was the white shrimp, P;. setiferus.
Seventeen species of fish were caught in the seine samples (Tables 14 and 15). The four nighttime samples were similar to each other in number of species and number of individuals. The four daytime samples were similar to each other, but fewer species and individuals were present in the daytime samples.
Seven species of macroinvertebrates were collected in the impingement samples, three of which were not caught elsewhere (Table 13). The most common invertebrate impinged was the blue crab, C. sapidus, with the white shrimp, P. setiferus, second in abundance (Tables 16-18).
5
Five species of fish, represented by 10 individuals, were caught in the impingement samples (Tables 16-18). There were 3 mosquito fish, G. affinis, 3 lined sole, Achirus lineatus, and 4 individuals of 3 different species of gobies. All fish were small, 30 mm standard length or less.
6
REFERENCES CITED McAden, D.C., C.N. Greene and W.B. Baker, Jr. 1984. Report #1. Colorado River Entrainment and Impingement Monitoring Program, Phase Two Studies -
amt July 1983 - June 1984. Ecology Division, Environmental Protection Department, Houston Lighting & Power Company.
McAden, D.C.. G.N. Greene and W.B. Baker, Jr. 1985. Report #2.
Colorado River Entrainment and Impingement Monitoring Program, Phase Two Studies -
July - December 1984. Ecology Division, Environmental Protection Department, Houston Lighting & Power Company.
USNBC.
1975. Final Environmental Statement. South Texas Project Units 1 and 2.
Houston Lighting & Power Company, City Public bervice Board of San Antonio, Central Power and Light Company, City of Austin. Docket Nos.
50-498 and 50-499.
Prepared by Office of Nuclear Reactor Regulation, United States Nuclear Regulatory Commission.
Wisenburg, M.R. 1985. Letter from Houston Lighting & Power Company Nuclear Licensing Department, to the Nuclear Regulatory Commission describing change in procedures for conducting entrainment monitoring in the siltation basin at the STP Reservoir Makeup Pumping Facility. File No.
SI-HL-AE-1294.
2 pp., w/ attachment.
7
Table 1 TEMPORAL VARIATIONS IN TEMPERATURE, TURBIDITY AND DISSOLVED OXYCEN AT MID-CHANNEL OF Tile COLORADO RIVER, SEPTEMBER 1985 Temperature (*C) pH Turbidity Dissolved 0,,
(ppm)
Sampling Dates Time (CST)
Surface Bottom Surface (inches)
Surface Bottom Depth (ft) 4 September 1400 32.5 30.2 7.8 18.5 8.9 0.6 18.0 4 September 2000 31.5 30.1 8.5 12.0 9.9 0.1 17.0 l
5 September 0220 31.3 30.0 8.2 17.5 10.2 0.4 18.5 5 September 0805 30.6 30.0 8.3 22.0 8.4 0.1 20.0 17 September 1220 29.4 29.4 8.0 17.0 7.0 0.2 18.0 cn 17 September 1820 29.7 29.3 8.0 18.0 8.8 0.2 17.5 l
18 September 0020 28.7 29.3 8.0 21.0 8.9 0.9 20.0 18 September 0700 27.9 29.3 7.8 21.5 6.9 0.5 17.0
l Table 2 TEMPORAL AND SPATIAL VARIATIONS IN CONDUCTIVITY (MILLIMHOS/CM)
AT MID-CHANNEL OF THE COLORADO RIVER, SEPTEMBER 1985 Sampling Time DEPTH (Ft.)
Dates (CST)
S 5
10 15 20 B
(Depth) 4 September 1400 3.5 4.8 29.8 45.5 46.7 (18.0) 4 September 2000 4.1 4.7 21.0 46.3 46.8 (17.0) 5 September 0220 3.9 4.0 28.0 45.5 47.0 (18.5) 5 September 0805 4.1 5.7 31.7 44.3 46.4 46.4 (20.0) 17 September 1220 2.5 12.0 43.8 45.5 46.2 (18.0) 17 September 1820 3.2 3.8 42.2 46.4 46.6 (17.5) 18 September 0020 2.6 6.6 40.6 46.4 46.7 46.7 (20.0) 18 September 0700 2.8 4.1 43.6 50.2 50.3 (17.0) 9
TABLE 3 l
TEMPORAL AND SPATIAL VARIATIONS IN SALINITY (PPT) l AT MID-CHANNEL OF THE COLO?iDO RIVER, SEPTEMBER 1985 Sampling Time DEPTH (Ft.)
Dates (CST)
S 5
10 15 20 B
(Depth) 4 September 1400 2.0 2.7 18.6 29.7 30.6 (18.0) 4 September 2000 2.3 2.6 12.8 30.3 30.7 (17.0) 5 September 0220 2.2 2.2 17.4 29.7 30.8 (18.5) 5 September 0805 2.3 3.2 19.9 28.9 30.4 30.4 (20.0) 17 September 1220 1.4 7.0 28.5 29.7 30.2 (18.0) 17 September 1820 1.8 2.2 27.4 30.4 30.6 (17.5) 18 September 0020 1.4 3.8 26.2 30.4 30.6 30.6 (20.0) 18 September 0700 1.6 2.3 28.4 33.2 33.3 (17.0)
I l
l 10
TABLE 4 TEMPORAL VARIATIONS IN WATER QUALITY PARAMETERS IN THE RMPF PIPELINE, SEPTEMBER 1985 Sampling Time Temperature Salinity Dissolved Dates (CST)
(*C)
(PPT)
Oxygen (PPM) pH 4 September 1600 30.0 2.2 8.8 8.5 l
4 September 2205 31.1 2.4 8.1 8.4 5 September 0220 29.4 2.2 7.8 8.4 5 September 0945 30.4 2.4 7.8 8.5 17 September 1345 29.8 2.1 7.7 8.0 17 September 1920 26.7 0.8 7.6 8.0 18 September 0115 28.5 2.0 7.5 7.9 18 September 0810 28.2 1.7 7.2 7.9 11
TABLE 5 TEMPORAL AND SPATIAL VARIATIONS IN TEMPERATURE, CONDUCTIVITY, SALINITY AND DISSOLVED OXYGEN AT THE STP REVOLVING SCREENS, SEPTEMBER 1985 Conductivity Temperature (*C)
(millimhos/cm)
Salinity (ppt)
Dissolved 02 (ppm) pH l
Sampling Dates Time (CST)
Surface Bottom Surface Bottom Surface Bottom Surface Bottom Surface 4 September 1654 32.2 31.8 3.8 4.2 2.2 2.4 11.4 7.2 8.5 5 September 0107 30.9 31.1 3.8 4.1 2.2 2.3 8.7 7.5 8.5 5 September 0907 30.0 30.1 3.9 4.4 2.2 2.5 8.7 6.2 8.4 U
11 September 1236 29.2 29.2 3.3 5.3 1.8 3.0 7.6 7.2 7.3 11 September 2033 29.0 29.1 3.3 3.8 1.8 2.2 7.7 7.7 7.8 12 September 0427 28.5 28.8 3.1 4.3 1.7 2.4 7.3 6.9 8.0 17 September 1418 30.0 29.5 3.1 5.8 1.7 3.3 6.4 6.7 8.0 17 September 2200 29.0 29.1 3.3 6.7 1.8 3.8 7.7 6.9 8.0 18 September 0600 27.9 28.1 3.2 3.2 1.8 1.8 8.2 8.3 8.0
s TABLE 6 AJERAGE COLORADO RIVER FLOW (CFS) ON DATES OF SAMPLE COLLECTION, SEDTEMBER 1985 DATE RIVER FLOW
- 4 September 490 5 September 462 1
11 September 637 12 September 610 17 September 917 18 September 837 s
- The arithmetic mean of daily flow values recorded at the beginning of each shift.
{
5
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TABLE 7 RESERVOIR MAKEUP PUMPING FACILITY (RMPF) DAILY PUMPAGE (M ), JULY - SEPTEMBER 1985 DATE JULY AUGUST SEPTEMBER 1
293,579 2
250,776 3
49,353 244,608 4
385,871 147,900 l
5 2,732,173 101,519 6
40,213 7
674,837 82,029 8
146,790 9
1,441,054 66,980 10 110,524 11 293,579 12 293,579 13 304,928 14 683,373 15 733,948 16 732,961 17 733,948 18 660,553 19 742,706 20 74,061 579,140 21 66,968 220,678 22 8,511 23 24 25 26 27 28 29 64,217 30 277,050 31 304,890 TOTALS 5,283,288 787,186 7,472,822 14
4 5
TABLE 8 s
MACR 0 ZOOPLANKTON AND FISH TAXA COLLECTED FROM THE COLORADO RIVER AND THE RMPF PIPELINE BY 0.5-MM MESH PLANKTON NET, 4-5 AND 17-18 SEPTEMBER 1985 TAXA COLORADO RIVER RMPF PIPELINE Mid-Surface depth Bottom Oblique ANNELIDA Unidentified Polychaeta X
X X
Polychaeta (Nereidae)
X X
X CHAETOGNATHA Sagitta spp.
X COPEPDDA Acartia tensa X
Halicyclops spp.
X Harpactacoid copepodida X
X Caligus spp.
X BRANCHIURA Argulus spp.
X X
X X
CIRRIPEDIA Barnacle cypris 3
MALACOSTRACA l
Corophiuu louisianum X
X l
Aegathoa spp.
X X
X l
Penaeus aztecus postlarvae X
X l
P. setiferus juv.
X 1
Macrobrachium spp. zoeae X
X X
((. acanthurus juv.
X
((. ohione juv.
X X
Palaemonetes spp. zoeae X
Callianassa spp. zoeae X
X X
Paguridea zoeae X
Paguridea glaucathce X
Callinectes spp megalopa X
X C[. sapidus juv.
X X
X Rhithropanopeus harrisii zoeae X X
X X
X R. harrisii megalopa X
\\
15
Table 8 (Cont'd)
TAXA COLORADO RIVER RMPF PIPELINE Mid-Surface depth Bottom Oblique PISCES Unidentified fish eggs X
Unidentified fish larvae X
X X
Anchoa mitchilli X
X Gambusia affinis X
X Syngnathus spp. larvae X
X Cynoscion arenarius X
Gobionellus spp. larvae X
G_. boleosoma X
Gobiosoma bosci X
l l
l 16
TABLE 9 NUMBER (PER 100 M ) 0F MACROZ00 PLANKTON AND FISH COLLECTED IN THE COLORADO RIVER BY 0.5-M PLANKTON hET ON 4-5 SEPTEMBER 1985 i
1 TAXA SURFACE MID-DEPTH BOTTOM CBLIQUE TIME (CST): 1400 2000 0220 0805 1400 2000 0220 0805 1400 2000 0220 0805 1400*
2000 0220 0805 8.4 11.7 34.4 13.0 48.7 Unidentified Polychaeta 8.8 Polychaeta (Nereidae) 2.6 Acartta consa 2.9 Halicyclory opp.
2.6 Harpactacold copepodida 3.4 w
2.9 w
Caligue app.
I Argulus opp.
6.8 10.0 3.8 12.6 I1.7 8.6 6.0 16.0 16.0 l
Barnacle cypris 22.9 Corophium loutstanum Aegathos spp.
18.6 3.4 3.8 4.2 5.7 Penaeus aztecus postlarvae 3.4 2.9 P. settferus juv.
Macrobrachium ohione juv.
3.1 3.4 3.0 Palmemonetes spp. zoese 2.9 6.0 Callianassa spp. zoene 2.9 Pagurides zoese j
Table 9 (Cont'd)
SURFACE MID-DEPTH BOTTOM OBt.100E TAXA TIME (CST): 1400 2000 0220 0805 1400 2000 0220 0805 1400 2000 0220 0805 1400*
2000 0220 0805 22.9 13.4 Callinectes spp. megalopa 80.0 9.3 C,.
sapidus juv.
Rhlthropanopeus harristi zoeae 6.8 68.2 140.8 26.9 105.0 861.9 100.4 465.7 5.4 13.7 6.1 10.4 928.0 892.4 85.3 13.4 5.9 22.9 Anchos siteht111 2.7 Cambunia affinin 3.8 2.9 Syngnathus spp. larvae 2.9 Cynoscion arenarius 2.9 Coblenellus spp. larvae 22.9 G. boteosoma
- No organisms in sample l
l l
l l
I l
l l
4 l
I TABLE 10 NUMBER (PER 100 M ) 0F MACROZ00 PLANKTON AND FISH COLLECTED IN THE COLORADO RIVER BY 0.5-M PLANKTON NET ON 17-18 SEPTEMBER 1985 l
SURFACE MID-DEPTH BOTTOM OBLIQUE TAX 4 TIME (CST): 1220 1820 0020 0700 1220 1820 0020 0700 1220 1820 0020 0700 1220 1820 0020 0700 34.5 14.6 53.4 6.3 11.3 2.7 29.7 36.3 9.2 Unidentified Polychaeta 8.7 Polychaeta (Nereidae) 2.8 Sagitta spp.
2.9 Halicyclops opp.
2.9 13.4 Caligus spp.
w Argulus opp.
16.5 22.9 32.1 5.9 65.8 37.2 43.6 9.1 114.7 1.1 Corophium loutalanum 8.7 4.6 Aegathna spp.
3.3 Macrobrachium spp. zoese 9.2 4.0 2.7 7.4 8.7 18.8 2.7 9.2 Calliananna spp. zoese Callinectes opp. megalopa 3.3 Rhtthropanopeus harristi zoeae 9.2 6.6 19.1 84.3 8.8 20.0 648.5 36.6 11.7 13.3 171.0 109.0 220.2 5.9 3.3 R,. harristi megalopa 22.9 Unidentified fish larvae 4.0
TABLE 11 NUMBER (PER 100 M ) 0F MACR 0 ZOOPLANKTON AND FISH COLLECTED FROM THE RMPF PIPELINE BY 0.5-MM MESH PLANKTON NET ON 4-5 SEPTEMBER 1985 TAXA TIME (CST) 1600 2205 0450 1045 Argulus spp.
10.8 Penaeus aztecus postlarvae 21.8 21.8 Macrobrachium acantharus juv.
65.5 65.5
((. ohione juv.
32.8 425.8 742.4 53.8 1
Paguridea glaucathoe 43.7 76.4 10.8 Callinectes sapidus juv.
10.9 Rhithropanopeus harrisii zoeae 32.8 43.7 10.8 Unidentified fish eggs 10.8 Unidentified fish larvae 10.9 Cobiosoma bosci 10.9 l
l 20
TABLE 12 NUMBER (PER 100 M ) 0F MACROZ00 PLANKTON AND FISH COLLECTED FROM THE RMPF PIPELINE BY 0.5-MM MESH PLANKTON NET ON 17-18 SEPTEMBER 1985 TAIA TIME (CST) 1346 1920 0115 0710*
l l
Polychaeta (Nereidae) 46.6 l
Argulus spp.
9.5 9.3 Rhithropanopeus harrisii zoene 18.6
/
Gambusia affinis 9.3 CNo organisms caught 21
TABLE 13 NEKTON COLLECTED IN THE COLORADO RIVER BY TRAWL, SEINE AND REVOLVING SCREENS, 4-5 AND 17-18 SEPTEMBER 1985 l
TAXA TRAWL
- SEINE REVOLVING SCREENS Penaeus aztecus X
X P_. setiferus X
X Macrobrachium acanthurus X
X M_. chione X
Callinectes sapidus X
X Rhithropanopeus harrisii X
Micropanope sculptipes X
Brevoortia patronus X
Anchoa mitchilli X
Gambusia affinis X
X Membras martinica X
Menidia beryllina X
Caranx hippos X
Eucinostomus melanopterus X
Lagodon rhomboides X
Cynoscion arenarius X
C_. nebulosus X
Leiostomus xanthurus X
Sciaenops ocellatus X
Mugil cephalus X
M,.
curema X
Gobiosoma bosci X
Cobionellus boleosoma X
X G_. shufeldti X
Citharichthys spilopterus X
Achirus lineatus X
X
- TRAWLS COMPLETED, NO ORGANISMS CAUGHT 22
l l
i TABLE 14 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (ann) 0F NEKTON COLLECTED IN THE COLORADO RIVER BY SEINE ON 4-5 SEPTEMBER 1985 TIME (CST):
1400 2000 0220 0805 TAXA No.
Wt.
L.
No.
Wt.
L.
No.
Wt.
L.
No.
We L.
Penaeus setiferus 243 157.6 44.6 123 56.9 38.7 92 51.3 42.6 85 73.1 49.7 Macrobrachium acanthurus 1
0.2 23.0 callinectes sapidus 1
0.1 12.0 1
0.6 20.0 Brevoortia patronus 2
3.3 41.0 1
12.1 81.0 U
Anchoa mitchilli l
1.3 45.0 2
1.4 38.5 Cambusia affinis 1
0.1 17.0 Membras martinica 1
0.7 38,0 Menidia beryllina 1
0.4 34.0 5
3.9 40.6 Eucinostomus melanopterus 1
0.3 24.0 2
1.1 28.0 1
0.6 30.0 Lagodon rhomboides 2
36.0 82.5 Cynoscion arenarius 3
7.2 48.7 2
12.2 67.5 C. nebulosus 1
2S.6 115.0 Leiostomus xanthurus 14 157.0 74.8 11 155.3 82.2 4
33.9 70.0 Mugil cephalus Cobionellus boleosoma 7
2.6 27.4 1
0.4 30.0 1
0.4 28.0 Citharichthys spilopterus 4
13.8 57.2 Achirus lineatus 2
0.3 16.5
TABLE 15 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (mm) 0F NEKTON COLLECTED IN THE COLORADO RIVER BY SEINE ON 17-18 SEPTEMBER 1985 TIME (CST):
1220 1820 0220 0700 TAIA No.
Wt.
L.
No.
Wt.
L.
No.
Wt.
L.
No.
Wt.
L.
Penaeus aztecus 3
0.2 18.3 P,.
setiferus 430 593.8 60.5 88 99.0 56.7 272 215.5 45.4 159 210.1 56.5 Macrobrachium acanthurus 1
0.2 26.0 callinectes sapidus 2
83.2 67.5 1
0.2 15.0 1
0.1 9.0 y
Brevoortia patronus 2
2.5 41.0 8
18.5 47.6 Anchoa mitchilli 14 7.0 32.8 Menidia beryllina 3
1.7 35.3 Caranx hippos 1
0.7 30.0 1
0.8 29.0 1
1.3 34.0 Eucinostomus melanopterus 2
0.5 23.0 7
1.5 20.1 Lagodon rhomboides 1
32.4 103.0 2
33.2 78.5 4
Cynoscion arenarius 1
4.1 62.0 1
6.1 72.0 Leiostomus xanthurus 11 93.8 68.9 4
40.1 76.0 Sciaenops ocellatus 1
312.6 255.0 Mugil cephalus 9
125.1 82.1 M. curema 1
9.8 78.0 2
22.4 79.0 Cobionellus boleosoma 1
0.4 27.0 1
0.4 30.0 2
0.4 24.5 Citharichthys spilopterus 1
3.8 65.0 1
7.6 79.0 Achirus lineatus 1
0.1 16.0 i
TABLE 16 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENCTH (nun) 0F NEKTON IMPINCED ON 2 INTAKE SCREENS IN 30 MINUTES ON 4-5 SEPTEMBER 1985 TIME (CST):
1654 0107 0907 TAXA No.
Wt.
L.
No.
Wt.
L.
No.
Wt.
L.
Penaeus aztecus 2
1.8 46.0 P,.
setiferus 1
0.3 31.0 2
2.5 50.5 Macrobrachium ohione 1
1.0 43.0 2
0.4 26.0 Callinectes sapidus 1
0.8 21.0 1
2.7 35.0 Gambusia affinis 1
0.1 20.0 Cobionellus shufeldti 1
0.1 21.0
TABLE 17 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (mm) 0F NEKTON IMPINGED ON 2 INTAKE SCREENS IN 30 MINUTES ON 11-12 SEPTEMBER 1985 TIME (CST):
1236 2033 0427 TAXA No.
Wt.
L.
No.
Wt.
L.
No.
Wt.
L.
5 Penaeus aztecus 2
0.3 28.5 P_. setiferus 1
1.3 57.0 Macrobrachium acanthurus 1
01.
25.0 M_. ohione 7
1.4 26.3 Callinectes sapidus 3
0.4 11.7 11 3.5 14.8 3
0.4 10.7 r
Rhithropanopeus harrisii 1
0.1 5.0 Gobiosoma bosci 2
0.4 19.5 Achirus lineatus 1
0.5
.26.0
TABLE 18 TOTAL NUMBER, TOTAL WEIGHT (g) AND MEAN LENGTH (nmi) OF NEKTON IMPINGED ON 2 INTAKE SCREENS IN 30 MINUTES ON 17-18 SEPTEMBER 1985 TIME (CST):
1418 2200 0600 TALA No.
Wt.
L.
No.
Wt.
L.
No.
Wt.
L.
U Penaeus aztecus 2
0.4 26.5 1
0.2 26.0 2
0.4 29.0 P. setiferns 7
4.2 39.4 2
3.0 58.0 9
9.7 51.1 Macrobrachium ohione 1
0.1 21.0 2
2.3 45.0 Callinectes sapidus 6
1.6 12.8 2
0.2 10.5 5
1.5 13.6 Micropanope sculptipes 1
0.1 5.0 Cambusia affinis 1
0.2 24.0 1
0.6 30.0 Cobionellus boleosoma 1
0.8 39.0 Achirus lineatus 2
1.2 26.0