Demographic characteristics of Black pomfret fish (Parastromateus niger, Bloch, 1795) in the southern waters of Oman Sea (Sistan and Baluchestan)

The Persian Gulf and the Oman Sea contain a variety of aquatic species. Among which, Parastromateus niger (Bloch, 1795), Black pomfret fishes are very important and, one of the tuna fish that has increased its catch in recent years. In this research during April to March 2020, trend catch and demographic characteristics and demographic characteristics of Black pomfret were estimated by collecting information from 4 catchment areas in the southern waters of Oman Sea (Sistan and Baluchestan) including Pozem, Konark, Beries and Pasabandar. In this study, more than 14,000 fish at the research stations were biometric and the growth parameters were infinite length of L∞ = 54 cm, growth factor K = 0.36 (yr-1), natural mortality M= 0.52 (yr-1), mortality and mortality (yr-1), F = 1.27, total mortality (yr-1), Z = 1.79 and exploitation coefficient (yr-1), E = 0.71, and the time zero was -0.39 for the years. This study shows that the annual harvest of Black pomfret stock has reached its maximum and any increase in fishing effort will affect this stock and will reduce the amount of exploitation in the long run.