SOME BIOLOGY ASPECTS OF OXEYE SCAD, SELAR BOOPS CAUGHT FROM BITUNG WATERS WITHIN MOLLUCCAS SEA OF INDONESIA

Abstract

Trevally species of oxeye scad, Selar boops is one of small pelagic species which an economic values. The species was exploited throughout the year by small-scale fishermen in Bitung waters using handline. The aim of this study was to determine some biological aspects of S. boops in Bitung waters area through measuring their lengths and weights, sex ratios, stages of oocyte, gonadosomatic index and type of spawning. Samples of fish were randomly collected each month at Bitung Oceanic Fishing Port during February 2016 to January 2017. Total samples of fish were used in this study 1659 consisting 841 male, 754 female, and unidentified 64. Length at first maturity (Lm) was 16,3 cm (FL) and asymptotic length (L∞) was 26,4 cm (FL). The overall length-weight relationships were W=0,01136 * L3,1640 (R2=0,988) with a positive allometric growth. The sex ratios were balanced between males and females. The average of gonadosomatic index was 1.02 while the lowest and highest values was 0.03 and 6.96 with partial spawning type. Identification and genetic confirmation of S. boops using DNA-COI analysis.