La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Morphometric relationships of penaeid shrimps in a coastal lagoon: Spatio-temporal variability and management implications
Auteurs :	R. Perez-Castaneda, Auteur ; O. Defeo, Auteur
Type de document :	Article
Dans :	Estuaries (25(2) APR 2002)
Article en page(s) :	282-287
Résumé :	Spatio-temporal variability in the length-weight relationship of four sympatric shrimp species (Farfantepenaeus aztecus, F. brasiliensis, F. duorarum, and F. notialis) was evaluated in the Celestun lagoon, Mexico. Monthly samples were taken throughout 2 yr in three hydrological zones (seaward, middle, and inner) and climatic seasons (Nortes, Dry, and Rainy). Significant intraspecific and interspecific differences in the length-weight relationships were detected among climatic seasons and hydrological zones, reflecting positive allometric growth. F. notialis registered the highest condition (weight at length), followed by F. duorarum, F. aztecus, and F. brasiliensis. The lowest values in condition were consistently registered during Nortes and at the seaward zone. All species showed a pattern consistent with a density-dependent effect on condition, that is a negative correlation between individual mean weight and total relative abundance. The immediate implication for managing this important multispecific coastal artisanal resource that is supported by our study is the restriction of fishing effort in the seaward zone, mainly during the Nortes season.

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