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  • The objective of this study is to investigate the sustainability properties of the stock of the shrimp trawl fishery in the Tonkin Gulf, Vietnam. Surplus production models of Verhulst-Schaefer and Gompertz-Fox are applied to the shrimp trawl fishery, which is a typical tropical fishery with the characteristic properties of small scale and multi-species fisheries. There are two shrimp spawning seasons per year in the Gulf. This implies that it is appropriate to divide the time scale into a half year in accordance with the biological year of the stock. The surplus production models which are usually associated to calendar year catch and effort data, in this study are applied for a half year time interval data. From 2000 to 2004, the total catch of the fishery fluctuated between 3.8 thousand tons and 7.9 thousand tons for a half year time interval. The range of the effort was about 3.5 to around 5.6 million towing hours respectively. The results indicated that the effort of the fishery should be reduced roughly 12% to 44% to archive the MSY and about 46% to 61% to reach the MEY. Under social discount rate, the effort should be decreased around 45% to 56% to archive the optimal yield.
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file details 244.pdf 2017-07-14 Public Download