PENDUGAAN BEBERAPA PARAMETER DINAMIKA POPULASI IKAN LAYANG (Decapterus macrosoma, BLEEKER 1841) DI PERAIRAN TELUK BONE, SULAWESI SELATAN

Abstract

his research was conducted in November to December 2012 which aimed to estimate the
population dynamic of mackerel fish through their age-group, growth, mortality, and yield per
recruitment. Samples were taken from the waters of sub district of Panyula, in the district of East
Tanete Riatang, in Bone Region. Age-group was measured using Bhattacharya method with the
help of Fish Stock Assessment Tools II (FISAT II) software. Growth and natural mortality were
measured by applying the equations of Von Bertalanffy and Empiris Pauly (respectively). Whereas
total mortality as well as yield per recruitment were estimated by applying Beverton and Hold
equation; and catch mortality was estimated by applying the equation of Z=F+M. Results showed
the average total length of 849 mackarel fish that was 121-295 mm. They were divided into 4
groups with 306.35 mm asymptotic length, 0,33 growth rate coefficient and theoritical age of 0.0294

year. Natural mortality rate, total and catch mortality, and exploitation rate were 0.3672
per year; 2,4358 per year, 2,0687 per year and 0.8493 (respectively). This indicated that an over
catch had occurred due to the higher catch mortality compared to the natural mortality as well as
the yield per recruitment, i.e. 0.0865 gram/recruitment.
Keywords : Population dynamic, mackerel fish, Bone Strait.