تعيين پيراسنجه هاي پويايي جمعيت ماهي شير(Scomberomorous commerson) با استفاده از روش پيشرفت مدها در آبهاي استان هرمزگان

Estimation of population dynamics parameters of Scomberomorus commerson using Modal Progression Method in the Hormouzgan province waters

Scombermorus commerson is one of the most important commercial fish species in the Persian Gulf and Sea of Oman. To arrange for a sustainable fishing pattern, growth parameters, mortality and exploitation rates of the fish were estimated. Fish length data were collected from 4515 fishes, science April 2007 to March 2008 in three major artisanal fish- landing sites Bandar Lengeh, Bandar Abbas and Bandar Jask in Hormouzgan province waters. The Von Bertalanffy growth parameters (Loo, K and to) were estimated at 150.24 (cm), 0.66 yearʹ1 and -0.157 year, respectively. The results showed that S. commerson grows very fast in the first 2 years. The results indicated that S. commerson attains its fork length 80.3cm at the end of first year. The fork length attained at the end of the second, third and fourth years were 114.1, 131.6 and 140.6cm, respectively. Growth performance index (0) was calculated at 4.1 which were in agreement with the findings of the other studies in the Indian Ocean. Total, natural, fishing mortality and exploitation rate were estimated at 2.11, 0.67, 1.44year! and 0.64, respectively. Five cohorts were distinguished based on Bhattacharyaʹs method.