海岸地帯管理ジャーナル

概要

SELECTIVITY OF Decapterus macarelus (SCAD) DRIFT GILLNET IN KAYELI BAY MALUKU BY KITAHARA’S METHOD

Agustinus Tupamahu

To study the gear selectivity on scad Decapterus macarelus fishing experiments using drift gill net with differents mesh sizes were conducted in Kayeli Bay Buru Island Maluku. To obtain data of fork length size composition, drift gillnets were operated at fish agregation devices along night time. The selectivity of drift gillnets for scad were estimated with Kitahara’s method. Mesh selectivity by a drift gillnet used for scad Decapterus macarelus shows a peaked curved with the efficiency at the peak of mesh selectivity increasing in proportion to the mesh size. The optimum size selectivity (fishing efficiency) of scad are ratio of 185 mm fork length class and 38 mm mesh size, 225 mm and 45 mm mesh size, and 255 mm and 51 mm mesh size.