Pertumbuhan dan Biologi Reproduksi Ikan Layang (Decapterus macrosoma) yang Didaratkan di Tempat Pendaratan Ikan (TPI) Pantai Labu, Kabupaten Deli Serdang

Abstract

Layang scad (Decapterus macrosoma) landed at TPI Pantai Labu, Deli Serdang, is a primary catch of significant economic value caught in the Malacca Strait waters. The objective of this study was to determine the growth and reproductive biology of layang scad landed at TPI Pantai Labu, Deli Serdang. The research was conducted from October 2024 to December 2024. A total of 140 samples were obtained during the study, consisting of 86 male and 54 female fish, with a length range of 100 mm - 221 mm and a weight range of 10 gr -101 gr. The results showed that the growth pattern of layang scad (D. macrosoma) is negative allometric (length growth is faster than weight growth) with the equation W = 0,00001L2,9768 The obtained condition factor of 1,053 indicates that the fish are less flattened. The Von Bertalanffy growth parameters for layang scad were Lt = 205,25 (1 – EXP (1.20(t+1.51)), with an asymptotic length (L∞) = 205,25 mm, a growth coefficient (K) = 1.51 per year, and a theoretical age (t0) = 1,20. The first capture size was 186,41 mm for female fish and 171,38 mm for male fish. The first maturity size was 170.44 mm for female fish and 162,77 mm for male fish. The sex ratio between males and females was 1:0,62. The layang scad found had Gonad Maturity Stages (TKG) I to TKG IV with a Gonadosomatic Index (GSI) ranging from 0,54% to 1,73%. The fecundity ranged from 7,137 to 163,277 eggs, and the egg diameter ranged from 0,15 mm to 0,52 mm, indicating a partial spawner spawning pattern.