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The biological interactions between species are not limited only to trophic relationships; parasitism and diseases also occur. However, predator-prey relationships have a dominant role. In fact, natural mortality can vary considerably with predation, famine, and disease, but predation seems to be the dominant factor (Daan, 1989). Studies on diet composition are crucial in community ecology considering that the use of resources by organisms has a major influence among population interactions within a community (Mequilla and Campos, 2007). Analysis of stomach contents could provide helpful information concerning the position of the fishes in the food web of their environment and estimation of trophic levels (Pauly and Christensen, 2000; Post et al., 2000). In addition, the quality and quantity of food are among primordial factors that ARTICLE INFO