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Table 20 Mean catch of adult and juvenile fishes per seine in all months at each station Year Station 4 Station 6 Station 11 2003 65.8 119.1 108.8 2002 126.6 206.1 172.5 2001 141.9 137.6 115.5 2000 222.7 140.5 98.8 1999 168.9 78.1 54.7 1998 165.4 115.0 54.4 1997 185.9 126.4 45.3 1996 106.1 109.3 91.2 1995 62.4 77.5 59.3 1994 81.2 609.1 46.3 1993 91.1 32.6 60.9 1992 181.6 113.9 122.8 1991 253.8 155.8 327.3 1990 103.3 96.1 76.3 1989 113.9 162.2 119.6 1988 118.7 129.6 111.2 1987 102.3 105.0 70.5 1986 112.1 102.5 80.3 1985 65.2 122.8 95.7 129
130 Mean Catch Per Seine 300 250 200 150 100 50 All Species Seine Stations 4, 6, and 11 All Species 0 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 Figure 167. Seines. <strong>Annual</strong> Average over All Stations. All Species. Mean catch per seine over all seine stations decreased in 2003, but remained at moderate values (Figure 167). The LOWESS line suggested a continued slight increase over the past 10 years. All Species (#/seine) 1000 100 10 Seines: All Stations 1 1980 1990 2000 2010 Year Figure 168. Seines. Long term trend in Total Trawl Catch.
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An Ecological Study of Gunston Cove
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ii An Ecological Study of Gunston C
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iv were collected on three sample d
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vi We recommend that: 1. Long term
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2 INTRODUCTION This section reports
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4 Table 1 Sampling Dates and Weathe
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6 immediately with formalin to a co
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8 subsample of known volume and res
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10 A. Climate and Hydrological Fact
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12 B. Physico-chemical Parameters:
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14 Dissolved Oxygen (mg/L) 16 14 12
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16 pH, NC Lab 9.5 9.0 8.5 8.0 7.5 7
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18 Secchi Depth (m) 1.2 1.0 0.8 0.6
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20 Ammonia Nitrogen (mg/L) 0.30 0.2
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22 Organic Nitrogen (mg/L) 1.2 1.0
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24 N/P Ratio (by mass) 60 50 40 30
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26 C. Phytoplankton Chlorophyll a,
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28 Figure 32. Phytoplankton Density
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30 The dominant cyanobacteria on a
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32 Total phytoplankton biovolume ca
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34 Melosira Figure 44. Phytoplankto
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36 Bosmina Density by Station (#/L)
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38 Moina Density by Station (#/m 3
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40 Diaptomus Density by Station (#/
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42 E. Ichthoplankton Larval fishes
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44 Clupeid Larvae (#/10m 3 ) 50 40
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46 Table 4 Adult and Juvenile Fish
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48 The abundance of each species in
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50 Average Number of Fish per Trawl
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56 Average Fish per Seine 600 500 4
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58 Macrobenthos (#/m 2 ) 500 400 30
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60 Total phosphorus levels were fai
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62 Table 10 Correlation and Linear
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64 Water Temperature (oC) 35 30 25
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66 Chloride (mg/L) 350 300 250 200
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68 Dissolved Oxygen (% saturation)
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70 Light Attenuation Coefficient (m
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72 Lab pH, GMU 11 10 9 8 7 Station
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74 Total Alkalinity (mg/L CaCO3), G
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76 Biochemical Oxygen Demand (mg/L)
Page 85 and 86: 78 Volatile Suspended Solids (mg/L)
Page 87 and 88: 80 Soluble Reactive Phosphorus (mg/
Page 89 and 90: 82 Un-ionized Ammonia Nitrogen (mg/
Page 91 and 92: 84 Nitrite Nitrogen (mg/L) 0.100 0.
Page 93 and 94: 86 Nitrogen:Phosphorus Ratio 70 60
Page 95 and 96: 88 Chlorophyll a, Surface (ug/L) 10
Page 97 and 98: 90 PBmax (ug C/ug Chl a/hr) 30 25 2
Page 99 and 100: 92 D. Zooplankton Trends: 1990-2003
Page 101 and 102: 94 Brachionus (#/L) 1000.0 100.0 10
Page 103 and 104: 96 Filinia (#/L) 1000.0 100.0 10.0
Page 105 and 106: 98 Polyarthra (#/L) 1000.0 100.0 10
Page 107 and 108: 100 Diaphanosoma (#/m3) 100000.00 1
Page 109 and 110: 102 Chydorid Cladocera (#/m3) 1000.
Page 111 and 112: 104 Copepod Nauplii (#/L) 1000.0 10
Page 113 and 114: 106 Clupeid Larvae (#/10m3) 1000.0
Page 115 and 116: 108 Atherinid Larvae (#/10m3) 10.00
Page 117 and 118: 110 F. Adult and Juvenile Fish Tren
Page 119 and 120: 112 Table 14 Mean catch of adult an
Page 125 and 126: 118 Mean Catch Per Trawl 50 40 30 2
Page 127 and 128: 120 Mean Catch Per Trawl 8 6 4 2 Tr
Page 129 and 130: 122 Mean Catch Per Trawl 120 100 80
Page 131 and 132: 124 Mean Catch Per Trawl 16 14 12 1
Page 133 and 134: 126 Seines The mean annual catch pe
Page 135: 128 Table 19 The number of seines i
Page 139 and 140: 132 Mean Catch Per Seine 250 200 15
Page 141 and 142: 134 G. Benthos Trends Oligochaetes
Page 143 and 144: 136 Amphipods (#/m2) 16 12 8 4 Stat
Page 145 and 146: 138 Corbicula (#/m2) 40 30 20 10 St
Page 147 and 148: 140 Table 21 Summary of Important T
Page 149 and 150: 142 observed through 1995. This has
Page 151 and 152: 144 being filled. A dredged channel
Page 153 and 154: 146 Anadromous Fish Survey Pohick,
Page 155 and 156: 148 sized fishes were seen, an atte
Page 157 and 158: 150 Table 3. Fish eggs and larvae c
Page 159 and 160: 152 Total 7 11 237 13 2 64 119 (2.3
Page 161 and 162: 154 Table 7. Adult anadromous and s
Page 163 and 164: 156 Table 8. Summary of alewife spa
Page 165 and 166: 158 Spawning information on gizzard
Page 167 and 168: 160 The information that pertains t
Page 169 and 170: 162 lower reaches of Pohick Creek i
Page 171 and 172: 164 Table 13. Catches of adult clup
Page 173 and 174: Appendix A Phytoplankton Species Di
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