Pendugaan Potensi Lestari dan Pertumbuhan Ikan Kembung (Rastrelliger spp.) yang di Daratkan di Pelabuhan Perikanan Samudera Belawan Sumatera Utara

Abstract

Highly market demand on Mackerel fish (Rastrelliger spp.) effected overfishing without controling by fishermen. This study was done from Maret until July 2016, and the aims were to study about the growth pattern, condition factor, growth parameter, and also potential of sustainable prediction of Mackerel fish to provide appropriate management model for the fish resource. The primary data is 442 samples Mackerel fish were observed, while the secondary data is catches data and fishing effort of Mackerel last 10 years and temperature of sea surface. Data were processed using software FISAT II. The growth pattern of Mackerel total is positive allometric. The range of condition factor are 0,58 – 3,10. The Von Bertalanffy growth parameters estimated were asymtotic length (L∞) = 220,50 mm, growth coefficient (K) = 1,30 year-1 and the age at zero length (t0) = -0,426. The rate of total mortality (Z) Mackerel fish is 2,564 year-1 with natural mortality rate (M) 1,249 year-1 and fishing mortality rate (F) 1,315 year-1 thus the rate of exploitation is obtained with the amount 0,513 and the value of this exploitation rate has exceeded the value of the optimum exploitation, which is 0,5. Potential estimation sustainable use of fish Mackerel Fox models. The potential of sustainable prediction was performed with Fox model. Value Maximum Sustainable Yield (MSY) Mackerel fish was 6,276,538.129 kg / year with optimum effort was 7939.647596 trips / year. Average utilization rate of 70,39% with an average insistence rate (TAC) of 179,49%, while allowable catch 150,1587365 kg/year. Based on the value of MSY and optimum effort Mackerel is known that fish are already experiencing overfishing. While based on average utilization rate, Mackerel fish in Belawan waters was still in a condition of solid catch.