Stability and robustness of multi-species fisheries management
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Fisheries management plays important role in ocean ecosystems management. Harvesting in marine ecosystems causes significant trophic structure alternation; therefore, multiple species fisheries management is now a consensus among ecologists. In addition, we need to consider adaptive harvesting management because ecosystems conclude uncertainly. A number of traditional fisheries managements, however, which focus on maximizing yields (e.g. Maximal Sustainable Yields (MSY)), are considered only single-species perspective and constant harvesting. Hence, it could cause excessive harvesting and extinction of some species. We develop one of the multiple species model with feedback harvesting. And we explore sustainability for multispecies fisheries models. Sustainable fisheries management should be based on its stability rather than its maximizing yields. In addition, concept of robustness is also important for decision makers. We show stability and robustness assessment of several harvesting patterns inclusively. |
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