Effectiveness of Nibea albiflora stock enhancement in Xiangshan Bay and prioritization of fishing strategy for the released stock
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Key Laboratory of East China Sea & Oceanic Fishery Resources Exploitation and Utilization, Ministry of Agriculture;East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China

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S932

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    Abstract:

    is one of the commercially important fish stocks that is depleted in Xiangshan Bay, a semi-enclosed tidal inlet located on the east coast of Zhejiang Province, East China. To rebuild the depleted stock and increase the fishermen's incomes, hundreds of thousands of hatchery juvenile are released into the bay annually. However, the effectiveness of the stock enhancement program has not yet been evaluated. In this study, we evaluated the recaptured yield and abundance of spawners originating from the hatchery-released juveniles of in Xiangshan Bay with a mark-recapture experiment and classical fishery models. We propose a method to prioritize the fishing strategy for the released stock. In September 2011, 11 055 5-month-old hatchery-reared juvenile were tagged with a scutcheon tag and released into Xiangshan Bay. The tagged fish were collected by local commercial fisheries during the two months following their release. The natural and fishing mortality of the hatchery-released individuals was 0.51/a and 1.31/a, respectively. In the fishery scenario, the stock enhancement program would generate 737 kg of recapture yield, and the direct input-output cost ratio would be 1: 3.99. The number of hatchery-released juveniles surviving to sexual maturity would be approximately 554, which would contribute to the spawning stock and help restore the depleted stock enhancement is strongly dependent on the level of fishing effort, and the appropriate reduction in the fishing effort would benefit both the recapture yield and the abundance of spawners originating from hatchery-released juvenile . If the fishing mortality declined to 0.46/a, or 36% of the estimated value, the total recapture yield would reach 1045 kg and the abundance of spawners originating from the hatchery-released juveniles would be 4413. These two values are 41.49% and 326.90% higher, respectively, than those in the current fishery scenario. In conclusion, the enhancement program in Xiangshan Bay shows good ecological performance and economic efficiency. An appropriate reduction in the fishing effort is essential to improve its effectiveness.

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姜亚洲,林楠,刘尊雷,袁兴伟,李圣法,程家骅. 象山港黄姑鱼增殖放流效果评估及增殖群体利用方式优化[J]. Jounal of Fishery Sciences of China, 2016,[volume_no](3):641-647

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  • Online: May 18,2016
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