PRESENT STATUS OF THE SHRIMP TRAWL FISHERY IN THE ...

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32 P. A. A. T. Jayawardane et al. 28 P. A. A. T. Jayawardane et al 100% 90% Others % Composition 80% 70% 60% 50% 40% 30% 20% O. tardoore Leiognathids Sciaenids Sea crabs Large shrimps 10% 0% Small shrimps J-98 M M J S N J-99 M Month M J S N Non-mechanised trawls 100% 90% Others 80% 70% 60% 50% 40% 30% 20% 10% 0% J-98 M M J S N J-99 M M J S N % Composition O. tardoore Leiognathids Sciaenids Sea crabs Large shrimps Small shrimps Month Mechanised trawls Figure 6. Monthly variation in the species composition of the catch of mechanized trawls
Shrimp trawl fishery in the west coast of Sri Lanka 33 % Frequency 15 10 5 0 Male : n=3649 X=11.4 Female : n=3811 X=11.34 5.8 6.6 7.4 8.2 9 9.8 10.6 11.4 12.2 13 13.8 Mid length (cm) 14.6 15.4 16.2 17 17.8 18.6 Male Female P.indicus % Frequency 25 20 15 10 5 0 Male : n=19 996 X=7.03 Female : n=15 209 X=7.51 3.3 3.7 4.1 4.5 4.9 5.3 5.7 6.1 6.5 6.9 7.3 7.7 8.1 Mid length (cm) 8.5 8.9 9.3 9.7 10.1 10.5 10.9 11.3 Male Female P.dobsoni 20 Male : n=10 051 X=6.96 % Frequency 15 10 5 0 Female : n=16 357 X=7.3 3.3 3.7 4.1 4.5 4.9 5.3 5.7 6.1 6.5 6.9 7.3 7.7 Mid length (cm) 8.1 8.5 8.9 9.3 9.7 10.1 10.5 10.9 Male Female P.coromandelica 20 Male : n=2265 X=15.1 % Frequency 15 10 5 Female : n=2234 X=16.86 0 9.8 10.6 11.4 12.2 13 13.8 14.6 15.4 16.2 17 17.8 Mid length (cm) 18.6 19.4 20.2 21 21.8 22.6 Male Female P. merguiensis Figure 7. Length frequency distributions of the major shrimp species caught in the catches of non-mechanised trawls : n=number of individuals X=mean length
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PRESENT STATUS OF THE SHRIMP TRAWL FISHERY IN THE ...

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