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Mean Catch Per Seine 100 80 60 40 20 Seine Stations 4, 6, and 11 White Perch and Banded Killifish White Perch Banded Killifish 0 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 Figure 169. Seines. <strong>Annual</strong> Average over All Stations. White Perch and Banded Killifish. White perch continued a long term decline in seine collections with a major decrease in 2003 to equal the lowest levels since the study began (Figure 169). This was somewhat contradicted by the LOWESS plot which showed a continued slight increase since the late 1990’s (Figure 170). Banded killifish was lower than its peak in 2002, but still among the highest values recorded since the study began (Figure 169). The LOWESS plot suggested that the increase was still continuing (Figure 171). White Perch (#/seine) 100 10 Seines: All Stations 1 1980 1990 2000 2010 Year Seines: All Stations 1 1980 1990 2000 2010 Year Figure 170. Seines. Long term trend in Figure 171. Seines. Long term trend in White Perch (Morone americana). All Banded Killifish (Fundulus diaphanus). All Stations. Stations. Banded Killifish (#/seine) 1000 100 10 131
132 Mean Catch Per Seine 250 200 150 100 50 Seine Stations 4, 6, and 11 Blueback Herring and Alewife Blueback Herring Alewife 0 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 Figure 172. Seines. <strong>Annual</strong> Average over All Stations. Blueback Herring and Alewife. Blueback herring and alewife were present in a number of seine samples in 2003, but when averaged over all samples did not obtain very large numbers. LOWESS trends were not strongly expressed, probably due to a large number of zero catches among the data set. The extremely high value in 1994 was the combination of a single very large catch and a reduced sampling regime. The catch of schooling alosids and anchovy is often hit or miss; if you happen to hit the school you can get very large catches. Blueback Herring (#/seine) 1000 100 10 Seines: All Stations 1 1980 1990 2000 2010 Year Alewife (#/seine) 1000 100 10 Seines: All Stations 1 1980 1990 2000 2010 Year Figure 173. Seines. Long term trend in Figure 174. Seines. Long term trend in Blueback Herring (Alosa aestivalis). All Alewife (Alosa pseudoharengus). All Stations. Stations.
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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)
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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 and 136: 128 Table 19 The number of seines i
Page 137: 130 Mean Catch Per Seine 300 250 20
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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