Pertumbuhan dan Laju Eksploitasi Ikan Kembung (Rastrelliger spp.) di Perairan Selat Malaka Provinsi Sumatera Utara

Abstract

Bloated Fish (Rastrelliger spp.) one type of economic fish in important for the community, this type is found in the waters of the Strait of Malacca. Due to the high demand of consumers in the fish market, causing fishermen to make large scale arrest. This study has objectives on accesing growth and exploitation rates of Bloated Fish in Malacca Strait, Medan Belawan District, North Sumatera Province. This study was held in three months, from March to May 2017. Data analysis used the ELEFAN I method (Electronic Lenght Frequencys Assesment Tool) by using FiSAT II (FAO-ICLARM Fish Stock Assesment Tool) software. The samples of Bloated Fish scad are 361. The growth pattern of Bloated Fish is negative allometric. The range of condition factor are 0,602 – 1,294. The range of length frequency distribution are 175 – 182 mm. Based on the growth equation of Von Bertalanffy Bloated Fish obtained during the research in the waters of the Straits of Malacca is Lt = 217,35{1-e-0,75(t+0,015)} which means the asymptothed length (L∞) of Bloated Fish (Rastrelliger spp.) 217,35 growth coefficient (K) of 0,75 per year and the theoic age (t0) Bloated Fish that is equal to -0,015. Total mortality (Z) of Bloated Fish (Rastrelliger spp.) of 2,837 per year. Estimation of natural mortality rate (M) of Bloated Fish (Rastrelliger spp.) of 0,891 per year and mortality due to catch (F) of 1,946 per year. So that the result of alleged exploitation rate of 0,68 per year.