Comparative Analysis of the Effects on Technical Efficiency and Harvest of Sea Scallops ('Placopecten magellanicus') by Otter Trawls of Various Mesh Sizes

摘要

A major objective of the study was to examine size selectivity. The purpose of examining size selectivity was to determine the feasibility of imposing mesh regulations on trawlers to reduce mortality of small scallops. The major effect on catches of small scallops of increased mesh sizes appears to be a reduction in harvesting efficiency. Escapement of smaller scallops because of larger meshes appears to be minimal. However, larger meshes appear to suggest considerable escapement. In terms of implementing mesh restrictions, larger meshes do not appear to be feasible if industry support is a concern to management authorities.