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The diet of demersal piscivorous fishes captured as bycatch of the commercial shrimping fleet off the Alvarado lagoonal system, Veracruz, Mexico, was studied. Nine collections distributed throughout the nortes (windy), wet, and dry seasons were made from November 1993 to January 1995. Sampling yielded a total of 646 fishes representing 10 families and 14 species, of which 44.9% had empty digestive tracts and were excluded from analysis. Trichiurus lepturus and Synodus foetens were the most abundant demersal predators in the collections. Differences in food consumption of the 7 most abundant predators were observed among the 3 seasons, with the greatest variety of prey (20 species) taken during the nortes season and the lowest variety (9 species) during the dry season. Five distinct trophic guilds were determined based on an index of relative importance of prey. Prey type and location of prey within the water column helped determine guild classification. The occurrence of different trophic guilds may allow for decreased competition for food resources on the continental shelf off Alvarado, Mexico. RESUMEN Se estudio la dieta de los peces piscivoros demersales capturados como fauna acompanante del camaron en la flota de barcos camaroneros del sistema de lagunas de Alvarado, Veracruz, Mexico. Se obtuvieron nueve cole- cectas que abarcaron las temporadas de nortes, lluvias y secas desde noviembre de 1993 hasta enero de 1995. Las muestras produjeron un total de 646 peces representados por 10 familias y 14 especies; 44.9% fueron encantrados con el tracto estomacal vacios y no fueron analizados. Trichiurus lepturus y Synodos foetens fueron los depredadores demersales mas abundantes en nuestras muestras. Se observaron diferencias en el consumo de alimen- to en las tres temporadas. La temporada de nortes mostro la mayor variacion de presa (20 especies), y la menor variacion se observo en la temporada de secas (9 especies). Cinco distintivos gremios troficos fueron identificados basados en el indice de importancia relativa de la presa. El tipo de presa y la localizacion de las presas en la colum- na de agua permitieron determinar la clasificacion de los gremios. La existencia de diferentes gremios troficos per- mite una disminucion en la competencia por recursos alimenticios en la plataforma continental del Alvarado, Mexico.

Trophic Relationships of Demersal Fishes in the Shrimping Zone Off Alvarado Lagoon, Veracruz, Mexico