Sepat Siam fish community (Trichopodus pectoralis Regan, 1910) in Semayang Lake, East Kalimantan

Abstract

Siam sepat (Trichopodus pectoralis) is a fish that lives with the characteristics of its life in mainland public waters such as rivers, lakes and flooded swamps. The Siam sepat is classified as a consumption fish, has morphological characteristics with a small mouth with a pointed snout and a flat body shape. The research was conducted from March to October 2018 in Semayang Lake, East Kalimantan. Fish samples obtained from fishermen’s catch using fishing gear, including nets, nets, tangkul, scoops and traps. This study used an enumerator to record the length and weight of the fish. The results of the research analysis showed that the size of the individuals who dominate the Siam sepat fish population is at the size of 14.0-17.0 cm (60.8%), the allometric growth pattern (-) with the equation W = 0.0393 * L2.6409. The size of the first caught (Lc) of the Siam Sepat fish was 17.31 cm, the maximum average length (L∞) was 22.75 cm and the growth coefficient (K) was 0.78 per year. Natural mortality (M) and fishing mortality (F) were 1.64 and 2.64 per year, respectively. Thus the rate of exploitation (E) = 0.62 has exceeded the optimum value indicating that the fishing effort of Siamese septic fish in Lake Semayang has occurred overfishing.