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22. Spawning must have occurred from late April or early May to mid to late May, with a possibility that some spawning took place in Pohick Creek. Table 9. Summary of blueback herring spawning data for Gunston Cove and Pohick and Accotink Creeks in 2003. Catch data from Pohick Creek and Accotink Creek have been combined. Date…. Adult herring In creeks Eggs* in Creeks Larval Alosa** in creeks Larval Alosa** In cove Larval Alosa** In channel 157 Juvenile herring *** Mar 27 1 0 0 Apr 6 0 29 5 Apr 10 16 5 0 Apr 12 0 5 2 Apr 19 -- 3 0 Apr 26 0 3 5 Apr 29 76 145 0 May 3 0 31 0 May 10 -- 152 0 May 15 105 24 0 May 16 0 -- May 23 0 8 2 May 29 20 40 0 May 31 0 0 0 Jun 12 17 11 0 Jun 26 17 8 251+5 Jul 7 0 Jul 10 0 0 Jul 24 0 10 121+1 Aug 8 0 0 Aug 21 0 0 8+0 Sep 4 125+45 Sep 22 147+92 Oct 9 0 Nov 24 0 Dec 10 0 *No. of fish eggs caught ** No. of Alosa larvae caught ***Newly transformed blueback herring juveniles caught in trawls and seines, respectively, in Gunston Cove and the river
158 Spawning information on gizzard shad in 2003 are gathered in Table 10. No adult gizzard shad were caught in Pohick or Accotink Creeks in 2003. Eighty yolk sack larvae were collected in Pohick Creek on May 10, and three more were caught in late May in Pohick. Several yolk sack larvae and three post-yolk sack larvae were caught in both the cove and the river on April 29. Larger numbers were caught at these sites on May 15. A few more showed up in cove collections in late May and June, but the largest numbers of yolk sack larvae were caught in the river on May 29 and June 12. A large number of postyolk sack larvae they were probably gizzard shad were collected in the river on July 10. No juveniles were caught in the seines and trawl collections made in the cove and the river. Spawning probably began in the cove and river in mid to late April. In Pohick Creek, spawning occurred in early May and may have continued to mid May. Spawning in the cove and river seems to have continued into late June. The larvae and juveniles apparently suffered high mortality or perhaps moved out of the area early.
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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)
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80 Soluble Reactive Phosphorus (mg/
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82 Un-ionized Ammonia Nitrogen (mg/
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84 Nitrite Nitrogen (mg/L) 0.100 0.
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86 Nitrogen:Phosphorus Ratio 70 60
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88 Chlorophyll a, Surface (ug/L) 10
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90 PBmax (ug C/ug Chl a/hr) 30 25 2
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92 D. Zooplankton Trends: 1990-2003
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94 Brachionus (#/L) 1000.0 100.0 10
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96 Filinia (#/L) 1000.0 100.0 10.0
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98 Polyarthra (#/L) 1000.0 100.0 10
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100 Diaphanosoma (#/m3) 100000.00 1
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102 Chydorid Cladocera (#/m3) 1000.
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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 and 138: 130 Mean Catch Per Seine 300 250 20
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: 156 Table 8. Summary of alewife spa
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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