Abstract: Sebastiscus marmoratus is the protected species in Ma′an Archipelago Special Protected Area, and plays an important role in the food webs. The biological parameters for S. marmoratus in Ma′an Archipelago Special Protected Area were estimated based on the fisheries data collected from Jan., 2009 to Feb., 2010 by using FiSAT II package. The growth parameters of von Bertalanffy formula estimated by ELEFAN I were: L∞=24.5 cm, K=0.39, and t0=-0.74 a. The natural mortality coefficient M estimated by Pauly′s empirical equation was 0.84. The total mortality coefficient Z estimated by length-converted catch curve was 3.04 and the fishing mortality coefficient F was 2.20. The stock has been over exploited mainly due to fishing. It suggested that the optimal catchable size of S. marmoratus should be 16.0 cm.

Key words: Sebastiscus marmoratus, growth parameters, mortality parameters, Ma′an Archipelago Special Protected Area