Population dynamics of the Groe fish Barbodes binotatus (Pisces: Cyprinidae) in the Nagan River, Aceh Province, Indonesia

The assessment of population dynamics of the groe fish Barbodes binotatus has never been performed, this species is one of the commercial freshwater fish in Aceh province and one of the main target for fishing by local fishermen. Hence, the objective of this study was to analyze the population dynamics of the groe fish B. binotatus in Nagan River, Nagan Raya District, Aceh Province, Indonesia. The survey was conducted from January to December 2016. A total of 409 fish samples were collected. The von Bertalanffy (von Bertalanffy growth function) growth parameters were utilized to analyze the population dynamics of B. binotatus using FAO-ICLARM Stock Assessment Tools-II (FISAT II). The results showed that the population dynamics of asymptotic length (L_∞) was 130.88 mm, coefficient of growth (K) was 0.70 year-1, growth performance index (Ø) was 4.08 year-1, time at which length equals zero (t0) was -0.014 year-1 and the optimum length of catch (L_opt) was 90.11 mm. In addition, the total mortality rate (Z) was 1.62 year-1 with natural mortality rate (M) = 0.95 year-1, fishing mortality rate (F) = 0.67 year-1, and exploitation rate (E) = 0.41 year-1. In conclusion that based on E value analysis displays that the exploitation rate of B. binotatus has not yet exceeded the sustainable limit based on the value of L_∞, K, t₀, Lt, L_opt of dominant >1 years old fishes caught.