Abstract
Layur fish (Trichiurus sp.) is a demersal fish that has important economic value as a fisheries commodity. Continuous layur fishing activities can result in a decline in layur fish stocks. The aim of this research is to determine the mortality rate, growth and utilization rate of Layur fish. Sampling was carried out in April, May and August 2020 and was carried out once each month at the Fish Auction Place (TPI) in Tenda Village, Hulonthalangi District, Gorontalo City. The method used is survey. Fish samples were taken using a systematic random sampling method. The data taken is data on the length and weight of the Layur fish. The results of the research obtained a sample of 187 individuals, with a length range of 8.30-69.50 cm. Total length and a weight ranging from 6.20 to 198.00 grams. The first size caught (Lc50%) was 46.10 cm total length. The results of calculating the relationship between length and weight show that the fish is allometrically negative, with the equation W = 0.0085L2.947. Growth analysis obtained L∞ of 47.00 cm. Total length, growth coefficient (K) of 0.72, t0 = - 0.094 years, with peak recruitment occurring in August. Total mortality (Z) is around 2.68/year, natural mortality (M) is 0.61/year and fishing mortality (F) is 2.70/year. The utilization rate (E) is 0.80, which indicates that the utilization rate is above optimum.