Population dynamic and spawning potential ratio of long-barbel sheatsfish (Kryptopterus limpok) in Tasik Giam Siak Kecil waters, Bengkalis, Riau Province, Indonesia 1Ali Suman, 1Duranta D. Kembaren, 1Khairul Amri, 1Andina R. P. Pane, 1Muhammad Taufik, 2Melfa Marini, 3Gatut Bintoro 1 Research Institute for Marine Fisheries, Cibinong, Indonesia; 2 Research Institute for Inland Fisheries and Fisheries Guidance, Palembang, Indonesia; 3 Fisheries and Marine Science Faculty, University of Brawijaya, Malang, East Java, Indonesia. Corresponding author: A. Suman,
[email protected] Abstract. Intensive exploitation due to high market demand of long-barbel sheatsfish (Kryptopterus limpok), locally known as “selais fish”, has continuously occurred throughout the year, so that it could threaten resources sustainability. Scientific assessment on population dynamic and spawning potential ratio are required as an input to support an apropriate fisheries management. The purpose of this study was to identify population dynamic and spawning potential ratio of the K. limpok with survey method. The study was conducted in Tasik Giam Siak Kecil, Bengkalis and surrounding waters based on data collected during period of survey, from April 2017 to November 2017. Result showed that the length at first capture (Lc) of K. limpok was 18.9 cm (total length) and the size of length at first maturity (Lm) was 19.9 cm. Sex ratio was slightly unbalance (1.0:1.1). The growth rate parameter (K) was 0.59/year with maximum length (L∞) of 43.05 cm. The estimate total mortality rate (Z) was 2.61 per year. While yearly ratio of fishing mortality (F) and natural mortality (M) were 1.41 and 1.2 respectively.