Efficiency of stick-held cast nets in the capture of Indian squid in the gulf of Thailand
1995
Mala Supongpan | Sinoda, Masatoshi
Series of light luring fishings, 84 hauls for 20 days, were conducted by commercial vessel off the west coast of the Gulf of Thailand using a stick-held cast net from March 1991 - February 1992. The mean catches were approximately constant, about 16 kg/haul, in a range of light-luring times from 1.5 h to 5.5 h. When a decrease in catch haul by haul occurred, it was clearly shown that the larger squid in a shoal were captured preferentially. However, there did not appear to be any considerable changes in the size structures of squid caught by successive hauls, when catches increased or decreased haul by haul. Estimated numbers of squid aggregated into lit area were about 1,000-3,000 squids as a shoal. This implied that the efficiency of the cast net is a function of the number of squid, or in other words, low efficiency might be cause mainly by dispersion of shoals at low density and by gear saturation at high density.
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