Some biological aspects of population dynamics on Bigeye tuna (Thunnus obesus) in the Oman Sea (Sistan and Baluchestan Province)

Abstract

Determination of population dynamics is the important indicator for evaluating of status and management of commercial species. In this research, trend catch and demographic characteristics and demographic characteristics of Bigeye tuna (T. obesus) were estimated by collecting information from 4 catchment areas on the coast of Sistan and Baluchestan Province including Brace, Ramin, Pozem and Konarak. In this project, more than 800 fish at the research stations were biometric and the growth parameters were L∞ = 113 cm, growth factor K = 0.45 (yr-1), natural mortality M= 0.71(yr-1), mortality and mortality (yr-1), F = 0.15, total mortality (yr-1), Z = 0.86 and exploitation coefficient (yr-1), E = 0.18, and the time zero was -0.25 for the years. Relative production per recruitment, relative biomass per recruitment, exploitation rate and average annual standing stock for kawakawa species were estimated Y '/ Rp =0.02, B' / Rp = 0.70, U= 0.10, respectively. This study shows that annual harvest of Bigeye tuna fish is less than its optimal level and can be planned for further exploitation of this species, especially offshore and international waters.