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Brown & May Marine Ltd


5.0 Otter Trawl Results 5.1 Catch Rates and Species Distribution The total number of individuals caught and the catch rate (number of individuals caught per hour) for fish and shellfish species by sampling area (control and East Anglia THREE) are given in Table 0.8 and are illustrated in Figure 0.9. The catch rates by sampling station are illustrated in Figure 0.10.


Spatial distribution plots for the most abundant species are given in Figure 0.11 to Figure 0.13, showing the percentage distribution by catch rate of M. merlangus, P. platessa and L. limanda. The circle size corresponds to the catch rate i.e. larger circles indicate greater catch rates.


A total of 12 species were caught; six at the control stations and 12 within East Anglia THREE. Overall, M. merlangus was the most abundant species caught, followed by P. platessa, L. limanda and then S. canicula. All other species were caught in relatively low numbers.


The highest catch rate for all species combined was recorded at station OT08 (95.8/hr) within East Anglia THREE, with P. platessa and L. limanda accounting for 75.0% of the catch.


The total catch rate was approximately equal in both sampling areas.


Table 0.8 Total Numbers of Individuals Caught and Catch Rate for Fish Species by Sampling Area Species


Number of Individuals Caught Common Name


Whiting Plaice Dab


Scientific Name


Merlangius merlangus Pleuronectes platessa Limanda limanda


Lesser Spotted Dogfish Scyliorhinus canicula Grey Gurnard Bullrout


Eutrigla gurnardus Lesser Weever


Common Dragonet Horse Mackerel Lemon Sole Sprat Squid


Myoxocephalus scorpius Echiichthys vipera Callionymus lyra


Trachurus trachurus Microstomus kitt Sprattus sprattus Alloteuthis sp.


Total No. of Individuals Total No. of Species


Catch Rate (No. of Individuals Caught per Hour)


Control 26


9 7 9 1 0 1 0 0 0 0 0


53 6


52.8


East Anglia THREE


22 35 29 9 4 4 2 1 1 1 1 1


110 12


54.7


Total 48


44 36 18 5 4 3 1 1 1 1 1


25.9 9.0 7.0 9.0 1.0 0.0 1.0 0.0 0.0 0.0 0.0 0.0


Catch Rate (Number of


Individuals Caught per Hour) Control


10.9 17.4 14.4 4.5 2.0 2.0 1.0 0.5 0.5 0.5 0.5 0.5


East Anglia THREE


16


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