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

Abstract

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.