Resumen del producto

A predator–prey model was applied to the red grouper Epinephelus morio fishery from Yucatan, Mexico, with the aim of understanding the spatial behaviour of a mid-sized fishing fleet. The heterogeneity of the environ- ment was considered, and different habitat quality levels were determined to address environmental differences. The behaviour of the fleet was also evaluated based on a sim- ulation of restricted fishing areas (RFA). The model was applied utilising 5 years of information on catch and fish- ing effort (1973–1977). Four levels of habitat quality were defined (low, medium, high and exceptional). The total costs and revenue for a fishing expedition in the areas of exceptional habitat quality were higher due to their location farthest from the base port. The fleet was most efficient during the winter at locations in the eastern continental shelf, with the number of these areas clearly decreasing in the autumn. The model simulation of the RFA showed a total revenue reduction of 7–27 % in scenarios of RFA foradult protection. When the RFA was implemented for the protection of juvenile fish, the total revenue was not reduced, indicating that this type of RFA might be a fea- sible management strategy for a sustainable fishery.

Palabras clave: Red grouper; Fleet dynamics; Restricted fishing areas

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