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IJFS 2021, 20 Back to browse issues page
Research Article: Estimation of fisheries reference points for Longtail tuna (Thunnus tonggol) in the Iranian southern waters (Persian Gulf and Oman Sea)
A. Haghi Vayghan *, S.A. Hashemi, F. Kaymaram
Department of Ecology & Aquatic stocks management, Artemia & Aquaculture Research Institute, Urmia University, P.O. Box: 57179-44514, Urmia, Iran. , a.haghi@urmia.ac.ir
Abstract:   (390 Views)
In the present research, the Catch-only method was used to determine the biological reference points (BRPs) of Longtail tuna (LOT) in Iranian southern waters (Persian Gulf and Oman Sea). Depletion-based stock reduction analysis (DBSRA) and Catch maximum sustainable yield (CMSY) models were used to estimate BRPs by applying data from 1997 to 2018.The B/BMSY was calculated as smaller than 1.0 in both models, while F/FMSY was mostly higher than 1.0, which indicates the overfishing of Longtail tuna in this area. In 2012, the F/FMSY ratio has exceeded over 1.01 and the B/BMSY ratio with 2 years delay was declined in 2014. Consequently, the biomass reduction followed in 2016, declined to the below of BMSY and the fishing pressure was not adjusted to combat. In comparison, DBSRA model indicated more cautious than CMSY in BRPs estimation for LOT in Iranian southern waters. Based on BRPs, it is recommended to implement an adjustment of annual harvest (around 55 thousand tons) as the simple (even quick) fisheries management strategies in order to guarantee the sustainable yield of this species in southern waters of Iran. We also recommend that catch-only methods could be treated as a temporary stepping-stone while sufficient data (e.g. size or age composition) is available for more reliable methods to be applied.
Keywords: Longtail tuna, Biological reference point, Fisheries management, Persian Gulf and Oman Sea
Full-Text [PDF 907 kb]   (166 Downloads)    
Type of Study: Orginal research papers | Subject: Stock assessment
Received: 2020/09/13 | Accepted: 2021/02/22 | Published: 2021/05/20
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Haghi Vayghan A, Hashemi S, Kaymaram F. Research Article: Estimation of fisheries reference points for Longtail tuna (Thunnus tonggol) in the Iranian southern waters (Persian Gulf and Oman Sea). IJFS. 2021; 20 (3) :678-693
URL: http://jifro.ir/article-1-4462-en.html


Volume 20, Issue 3 (2021) Back to browse issues page
Iranian Journal of Fisheries Sciences Iranian Journal of Fisheries Sciences
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