Diet of the mutton snapper Lutjanus analis (Cuvier) from the Gulf of Salamanca, Colombia, Caribbean sea
Abstract:The diet of the mutton snapper, Lutjanus analis, was investigated through frequency of occurrence, gravimetric and numerical methods, and the Geometric Index of Importance (GII). In total, 128 stomachs were collected and examined during four research cruises carried out in December 1995, April and August 1996, and February 1997. Prey representing at least 106 taxa were found from the 625 prey items analyzed. The analyses characterized this species as a generalist, opportunistic carnivore. Crustaceans of the infra-order Brachyura, mainly from the family Portunidae were most important. In order of preference, they were followed by bony fishes (Teleostei), stomatopods and shrimps. The knowledge of the trophic spectrum at generic and specific taxonomic levels is substantially expanded in this study. Continuous feeding during the day was surmised from the data. A positive relationship was found between fish size and mean prey weight, which is consistent with optimum foraging theory.
Document Type: Research Article
Publication date: September 1, 1999
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