Title of article :
Population dynamic parameters of Thunnus tonggol (Bleeker, 1851) in the Persian Gulf and Oman Sea
Author/Authors :
Kaymaram، F نويسنده Iranian Fisheries Research Organization,P.O.Box:116-13185, Tehran, Iran , , Darvishi، M نويسنده Persian Gulf and Oman Sea Ecology Center, P.O.Box:1579 Bandar Abbas, Iran , , Behzadi، S نويسنده Persian Gulf and Oman Sea Ecology Center, P.O.Box:1579 Bandar Abbas, Iran , , Ghasemi، S نويسنده Iranian Fisheries Research Organization,P.O.Box:116-13185, Tehran, Iran ,
Issue Information :
فصلنامه با شماره پیاپی 0 سال 2013
Abstract :
به منظور ارزيابي پارامترهاي ذخيره دادههاي فراواني طولي ماهي هوور از مهر ماه 1385 تا شهريور 1386مورد تحليل قرار گرفتند. ماهي هوور عمدتاً توسط شيوه گيل نت صيد مي گردد. ميزان صيد گونههاي تون و شبه تون ماهيان به مرز 174234 تن رسيده است كه نزديك به 64 درصد آن ماهي هوور مي باشد. طول بينهايت اين ماهي 72/133 سانتيمتر ،ضريب رشد 35/0 در سال ورابطه طول و وزن 83/2 L 00002/0=W ميباشد.
ضريب مرگ و مير كل با استفاده از روش پاول ودرال 82/1 در سال، مرگ و مير طبيعي 44/0 در سال و مرگ و مير صيادي 38/1 در سال تخمين زده شد.
Abstract :
Length frequency data of the longtail tuna, Thunnus tonggol collected from October 2006 to September 2007 were analyzed for evaluation of the stock parameters. T. tonggol is mainly caught by gillnet method. Yearly tuna and tuna-like catches in Iran are of the order of 174,234 mt, close to 46% of which are longtail tuna. The VBG parameters for longtail tuna were: L? =133.72cm; K=0.35 year?1.The length –weight relationship was estimated as: W=0.00002 L 2.83.The instantaneous rates of total mortality (Z) was estimated by using the Powell-Wetherall plot as 1.82 year?1. The instantaneous rate of natural mortality was obtained by Pauly equation (M=0.44 year?1) and the instantaneous rate of fishing mortality (F) estimated from Z-M=1.38year?1.
Journal title :
Iranian Journal of Fisheries Sciences
Journal title :
Iranian Journal of Fisheries Sciences