PENDUGAAN PARAMETER POPULASI IKAN CAKALANG (Katsuwonus Pelamis) DI PERAIRAN SENDANGBIRU, JAWA TIMUR

Abstract

Skipjack is the dominant fish caught in Sendangbiru waters. This study is pivotal as a basis for fisheries management in order to skipjack stocks can be used sustainably. The research aims to estimate the population parameters of skipjack tuna (Katsuwonus pelamis) including growth patterns, fish length distribution, growth parameters, mortality, and exploitation rate. Skipjack tuna samples were taken from the Pondokdadap fish landing site (TPI) from July to October 2019 using the purposive sample method. The total samples were 1431. The length weight data is processed using MS software. excel 2013 to find out the growth pattern. The length distribution data is processed with MS software. excel 2013 to determine the size of the dominant fish caught. The skipjack length frequency data was then processed using the FiSAT II program to estimate growth parameters, mortality and exploitation rates. The results showed the skipjack in Sendangbiru waters had a positive allometric growth pattern with the dominant fish size caught at 42 cmFL. Maximum length (L∞) of 87.65 cmFL and the growth rate coefficient (K) of 0.69 per year, t0 of -0.17 per year. The natural mortality (M) of 0.93 per year, fishing mortality (F) 1.25 per year and total mortality (Z) of 2.18 per year. Meanwhile, the exploitation rate (E) of skipjack tuna in Sendangbiru waters is estimated to be 0.57.