پويايي جمعيت ماهي طلال (1817 Rastrelliger kanagurta, Cuvier) در آب هاي استان هرمزگان

Population Dynamic of Indian Mackerel, (Rastrelliger kanagurta, Cuvier 1817) from Hormozgan Waters, Iran

به منظور بررسي پويايي جمعيت ماهي طلال (1817 Rastrelliger kanagurta، Cuvier) نمونه برداري به صورت ماهانه از آبان ماه91 الي مهرماه 92 و به روش تصادفي ساده در مناطق تخليه صيد شهر بندرعباس و جزيره قشم انجام گرديد. در مجموع فراواني طول كل وچنگالي 2340 نمونه ماهي ثبت شد كه از اين بين 525 عدد ماهي به طور هم زمان مورد اندازه گيري طول- وزن قرار گرفتند. نتايج نشان داد كه اندازه طول كل ماهي طلال در دامنه 913/9 تا 35/5 سانتي متر (23/6) بود. رابطه طول- وزن به صورت W=0/0063 3/27 TL به دست آمد و الگوي رشد اين ماهي ايزومتريكتعيين گرديد (0/05

To survey on population dynamics of Indian Mackerel، (Rastrelliger kanagurta، Cuvier 1817) in the Persian Gulf and Oman Sea random sampling was carried out monthly from November 2012 to October 2013. Length frequency data were recorded randomly from Bandar Abbas and Qeshm Island landing monthly. A totally of 2340 individuals were recorded for length frequency thorough، 525 fish were recorded for length- weight relationship. The average total length (TL) of Indian mackerel was calculated 23.6±2.2، with a range of 13.9 to 35.5 centimeters. The length-weight relationship was determined as W= 0.0061FL 3.27، and it showed an isometric growth pattern. The asymptotic length (L∞) and growth coefficient (K) were estimated as 44.2(cm) and 0.64(yr-1)، respectively. The value of to was calculated -0.2، and the longevity was estimated 4.38 years. The growth equation of Von Bertalanffy was obtained at L (t) = 44.2(1- exp (-0.64(t-(-0.2))) for Indian mackerel. Maximum recruitment was in June at 16.2 percent. Total mortality (Z) rate was estimated 3.38 (yr-1) on Length-converted catch curve method. The rates of natural mortality (M) on Pauly's empirical equation، fishing mortality (F) and exploitation ratio were estimated 1.29 (yr-1)، 2.09 (yr-1) and 0.62، respectively.