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handle: 10261/325888 , 10508/1287
Se determina la composición de la dieta de la merluza Merluccius gayi (Guichenot, 1848) en la zona norte de Chile, en el periodo de abril de 1993 a marzo de 1994, mediante muestreos mensuales. Al analizar 1576 estómagos se identificaron 22 taxa-presa y determinaron tres grupos tróficos. El mayor aporte a la dieta estuvo representado por los crustáceos bentónicos, como el camarón de profundidad Heterocarpus reedi (Bahamonde, 1955) y una presa pelágica: Euphausia mucronata (Sars, 1883). A pesar de la significativa ocurrencia de H. reedi en todos los tamaños analizados, las tallas medias de este macrocrustáceo no tienden a aumentar con el tamaño del predador. Se destaca el carácter oportunista de esta especie y la predación selectiva sobre ejemplares de H. reedi que se han concentrado en el área de pesca, comparando estos resultados con los obtenidos en anteriores investigaciones en términos del comportamiento trófico de la merluza.
The diet composition of Merluccius gayi (Guichenot, 1848) off northern Chile was studied between April 1993 and March 1994 with monthly sampling. Twenty-two prey taxa, comprising three trophic groups, were identified in the stomach contents of 1576 fishes. The highest contribution to the diet was constituted by benthic crustaceans, such as the deep-sea shrimp Heterocarpus reedi (Bahamonde, 1955) and the pelagic prey Euphausia mucronata (Sars, 1883). Although the ocurrence of H. reedi was significant in all size ranges analyzed, the mean size of these macrocrustaceans did not increase with predator size. The opportunistic characteristic of this species, and its selective predation on H. reedi individuals that concentrated in the fishing area, is highlighted, comparing the present results with those obtained in previous studies on the trophic behaviour of hake.
Instituto Español de Oceanografía
Pacífico suroriental, Dieta, Pesquerías, Chile, Merluccius gayi
Pacífico suroriental, Dieta, Pesquerías, Chile, Merluccius gayi
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