Abstract
We consider a fishery model with two sites: (1) a marine protected area (MPA) where fishing is prohibited and (2) an area where the fish population is harvested. We assume that fish can migrate from MPA to fishing area at a very fast time scale and fish spatial organisation can change from small to large clusters of school at a fast time scale. The growth of the fish population and the catch are assumed to occur at a slow time scale. The complete model is a system of five ordinary differential equations with three time scales. We take advantage of the time scales using aggregation of variables methods to derive a reduced model governing the total fish density and fishing effort at the slow time scale. We analyze this aggregated model and show that under some conditions, there exists an equilibrium corresponding to a sustainable fishery. Our results suggest that in small pelagic fisheries the yield is maximum for a fish population distributed among both small and large clusters of school.
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Acknowledgments
Nguyen Trong Hieu was supported by the Grand NAFOSTED, N0 101.02-2011.21. This work have been supported by the tripartite AWA Project (BMBF and MESR-MAEE-IRD) “Ecosystem Approach to the management of fisheries and the marine environment in West African waters”. We thank the anonymous referees for their valuable comments.
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Hieu, N.T., Brochier, T., Tri, NH. et al. Effect of Small Versus Large Clusters of Fish School on the Yield of a Purse-Seine Small Pelagic Fishery Including a Marine Protected Area. Acta Biotheor 62, 339–353 (2014). https://doi.org/10.1007/s10441-014-9220-1
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DOI: https://doi.org/10.1007/s10441-014-9220-1