Abstract
Mesh selectivity experiments were carried out using single and double codends in order to reduce the capture of small sizes of fish by northern trawlers in the Pacific coast of the Kuril Islands in September 1991. The mesh selectivity of the single codend was compared with that of the double codend commonly used in the experimental area. The estimated selection curves indicate the double codend has a for lower mesh selectivity for Walleye pollack and flounders than the single codend. It is suggested from underwater observations by video camera that the overlapped meshes decrease the mesh area, resulting in the low efficiency of mesh selection. From the results obtained the single codend of the presently employed mesh size is desirable to release undersized fish.
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