Estimating biological reference points for Largehead hairtail ( Trichiurus lepturus ) fishery in the Yellow Sea and Boha
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Estimating biological reference points for Largehead hairtail (Trichiurus lepturus) fishery in the Yellow Sea and Bohai Sea Yupeng Ji1, Qun Liu1*, Baochao Liao2, Qingqing Zhang1, Ya’nan Han1 1 Fisheries College, Ocean University of China, Qingdao 266003, China 2 Department of Mathematics, Shandong University, Weihai 264209, China
Received 3 July 2018; accepted 15 October 2018 © Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract
It is important to find a reliable method to estimate maximum sustainable yield (MSY) or total allowable catch (TAC) for fishery management, especially when the data availability is limited which is a case in China. A recently developed method (CMSY) is a data-poor method, which requires only catch data, resilience and exploitation history at the first and final years of the catch data. CMSY was used in this study to estimate the biological reference points for Largehead hairtail (Trichiurus lepturus, Temminck and Schlegel) in the Yellow Sea and Bohai Sea, based on the fishery data from China Fishery Statistical Year Books during 1986 to 2012. Additionally, Bayesian state-space Schaefer surplus production model (BSM) and the classical surplus production models (Schaefer and Fox) performed by software CEDA and ASPIC, were also projected in this study to compare with the performance of CMSY. The estimated MSYs from all models are about 19.7×104–27.0×104 t, while CMSY and BSM yielded more reasonable population parameter estimates (the intrinsic population growth rate and the carrying capacity). The biological reference points of B/BMSY smaller than 1.0, while F/FMSY higher than 1.0 revealed an over-exploitation of the fishery, indicating that more conservative management strategies are required for Largehead hairtail fishery. Key words: CMSY, surplus production models, maximum sustainable yield, Yellow Sea and Bohai Sea, Trichiurus lepturus Citation: Ji Yupeng, Liu Qun, Liao Baochao, Zhang Qingqing, Han Ya’nan. 2019. Estimating biological reference points for Largehead hairtail (Trichiurus lepturus) fishery in the Yellow Sea and Bohai Sea. Acta Oceanologica Sinica, doi: 10.1007/s13131-019-1343-4
1 Introduction In China, fishery management methods are mainly the closure of summer season (May, June, July and August) and spawning ground, minimum mesh size regulation, and fishing power control (Wang, 2012; Shen and Heino, 2014; Yue et al., 2015). Because of the limited and poor data, maximum sustainable yield (MSY) in China fisheries are commonly unavailable, which may be one of the reasons that TAC (Total Allowable Catch) cannot be implemented in China (Wang, 2012). Therefore, it is important to find an appropriate method to estimate MSY or TAC for the fishery management in China. Hairtail (Trichiurus lepturus) is widely distributed in the Yellow Sea and Bohai Sea. From 1986 to 2012 the total catches in the region for this fish species ranged from 7.38×104 to 32.89×104 t. Studies on this fish species have mostly concentrated on the effect
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