Stock assessment of Yellowfin tuna, Thunnus albacares (Bonnaterre, 1788) using the LBB and LB-SPR methods in the northern Oman Sea, Iran

Message:
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:

The current work aimed to develop a framework for the estimation of the optimized catch limit of the Yellowfintuna(YFT),Thunnus albacaresstock using catch data in the Iranian southern waters.In this study, two methods were employed to determine the biological reference points (BRPs) of this species. Biometry data was collected for 18 years (1993-2019) and the optimized catch limit was estimated using the limited data approaches. In an estimation method of Length-based Bayesian biomass(LBB), the highest length of this species was calculated as 166 (163-169) cm. The estimate of F/M= 1.9 (1.35-2.5) confirms the overfishing of yellowfin tuna, but the estimate of B/B0=0.17 (0.109-0.238) shows the overfishing of the biomass. In an estimation method of length-based spawning potential ratio (LB-SPR), F/M>2.5 is upper the level that probably results in the maximum sustainable yield (F/M= 0.8-1.0). In the present study, the spawning potential level of the population was estimated at approximately 11%, which means over-exploitation of this species so far. The results showed that the exploitation ratio of YFTstock is overfishing (overexploitation) and a decrease in exploitation ratio and fishing effort are proposed. Regarding the condition of yellowfin tuna stock, both LBB and LBSPR methods confirmed each other and there is no big difference between them.

Language:
English
Published:
International Journal of Aquatic Biology, Volume:11 Issue: 4, Aug 2023
Pages:
313 to 320
magiran.com/p2654585  
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یک‌ساله به مبلغ 1,390,000ريال می‌توانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
  • حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران می‌شود.
  • پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانه‌های چاپی و دیجیتال را به کاربر نمی‌دهد.
In order to view content subscription is required

Personal subscription
Subscribe magiran.com for 70 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!