Population dynamics of sailfin catfish (pterygoplichthys sp. Hancock, 1828) in sidenreng lake water, Sidenreng Rappang District, South Sulawesi

Abstract

The aim of this research is to know some dynamic parameters of cat fishes population cohort, growth, mortality, exploitation rate, and Relative Yield per Recruitment Relative (Y / R’) based on sex. The usefulness of this research is expected to be a basic data to provide an overview of age distribution, growth patterns, and mortality as well as the estimation of cat fishes rate of exploitation in Sidenreng Lake. In addition, the results of this study are expected to become information material for appropriate and sustainable management steps. The research was conducted for two months on March until April 2019 in Sidenreng Lake, Sidenreng Rappang Regency, South Sulawesi. Analysis of sample fish was carried out at the Laboratory of Fisheries Biology, Department of Fisheries, Faculty of Marine Sciences and Fisheries, Hasanuddin University, Makassar. Sampling of catfishes is obtained from all catches of one fisherman operating in Lake Sidenreng. The number of cat fish samples obtained during the study were 1056, consisting of 565 male cat fishes and 491 female cat fishes. The results of the analysis using a 2 cm length class interval obtained 16 classes. Cohort in the cat fishes in male fish and female fish there were 2 cohorts each. The growth rate coefficient for male fish and female fish was 0.69 per year and 0.46 per year fish reach the maximum length faster than female fish. The mortality value obtained in male and female cat fishes shows that the mortality value is more due to natural mortality than the capture mortality value.