Abstract

OLIVEROS-RAMOS, Ricardo  and  TAM, Jorge. Management strategy evaluation (MSE) for a harvested logistic population. Ecol. apl. [online]. 2010, vol.9, n.1, pp.49-59. ISSN 1726-2216.

The sustainable management of the fisheries is still an open problem. The Management Strategy Evaluation (MSE) allows the comparison of the performance of different strategies, based on the accomplishment of operational objectives, proposed in order to ensure sustainability. The goal of the present work was to conduct a theoretical analysis on the evaluation of different management strategies under conditions of uncertainty from the description of the initial biomasses that can be managed sustainably (viability kernel) and their related sustainable yields (viable controls). The catches were modeled by Y = (1+δ)(1 +ω)Y^* , where δ,ω > 0 are random variables and Y* is the catch quota given by each management strategy from a total biomass estimate with uncertainty. We explored ten management strategies based on viability theory: E1) social quota, E2) Y_max(B), E3) Y average between Y_min and Y_max (B), E4) Y random between Y_min and Y_max(B), E5) F_MSY, E6) Y_PA = Y precautionary, E7) average between Y_pa and Y_min, E8) random between Y_pa and Y_min. E9) Y_viable= MVY and, E10) average between Y_pa and MVY. Management strategies were evaluated according to nine indicators; three based on risks of sustainability loss, four based on mean and variance of biomasses and catches obtained, and two based on average time when catches were higher than the social quota and when fishery moratoria were imposed. Based on these indicators we determined that strategy E10, which combines precautionary approach and viability results, had best results, both in biomass conservation and fishery production.

Keywords : Viability theory; fisheries management; discrete logistic with harvest; stochastic simulation.

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