Abstract
Experiments to examine the selectivity of Scottish demersal pair trawls were carried out using a new version of the covered cod-end technique. The small mesh cover was supported by flexible hoops designed to hold the cover netting clear of the test cod-end and thus reduce masking of the cod-end meshes by the cover. Two typical Scottish 447 kW North Sea pair trawlers were chartered for this work and the test cod-ends were fitted directly to their trawl gear. Combinations of three mesh sizes and three cod-end diameters were tested and catches of haddock, whiting and cod sampled. Both mesh size and cod-end diameter had a higly significant effect on selectivity, with 50% retention lengths increasing with increasing mesh size and decreasing cod-end diameter. Models quantifying these effects were developed.
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