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Abstract

The aim of this study is to develop a framework for investigating the catch trend and estimating the optimized catch limit of Frigate tuna (FRI) stock by collecting catch data in the Iranian southern waters, including the Persian Gulf and the Oman Sea. Two methods were employed to determine the biological reference points (BRPs) of Frigate tuna in the Persian Gulf and Oman Sea.  Catch data spanning 26 years (1997-2022) was utilized, and the optimized catch limit was estimated using a limited data approach. The average catch (Ct) over this period was 22,439 tons (95% confidence interval 18,299-26,638 tons), showing a significant increase over the past two decades (R= 0.9, P<0.05). The average maximum sustainable yield (MSY), current biomass to the biomass of MSY (B/BMSY) ratio, the ratio of current fishing mortality to the fishing mortality rate of MSY (F/FMSY), and saturation (S= B/K) ratio were obtained using the extension of Catch-MSY (CMSY) and Stochastic Surplus Production model in Continuous-Time (SPiCT). The results from different models showed that the current B/BMSY ratio, F/FMSY ratio, and MSY were not significantly different based on a t-test (P<0.05). The findings from the last year of the study indicated that the exploitation ratio in the Frigate tuna stock is below sustainable levels (under exploitation), our result indicating that more exploitation of FRI species is possible in the Persian Gulf and Oman Sea.

Keywords

Frigate tuna Catch-MSY Surplus Production model Persian Gulf Oman Sea

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

The authors transfer the copyrights of their papers to the Iranian Society of Ichthyology. However, the information could be used in accordance with the Creative Commons licence (Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

How to Cite
HASHEMI, S. A., DOUSTDAR, M., & DUTTA, S. (2025). Catch-based data-limited stock assessment of Frigate tuna (<i>Auxis thazard</i> Lacepède, 1800) in the Persian Gulf and Oman Sea (Iranian southern waters). Iranian Journal of Ichthyology, 12(2), 101–112. https://doi.org/10.22034/iji.v12i2.1026
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