MESH SELECTIVITY CURVES FOR FLOUNDER PARA LICHTHYS-OLIVACEUS TRAMMELNET

To obtain mesh selectivity curves for trammelnets for the flounder Par alichthys olivaceus, probabilities of truncations by interior meshes w ere calculated on the basis of a lengthgirth relationship of the fish. For the calculation, girths at the end of the operculum and the anus (Ga) were measured with specimens from commercial catches. As a twine was tangled at the pterygiophore of the anal fin and fish tended to be enmeshed obliquely, the Ga-truncation curves calculated were revised by substituting a mesh perimeter phi with 0.8 phi which was obtained f rom girths along net marks on fish bodies. The mesh selectivity curves closely fitted the length frequency distribution of the catches from commercial nets of respective mesh sizes.