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Espectro alimentar e variação sazonal da dieta de Plagioscion squamosissimus (Heckel, 1840) (Osteichthyes, Sciaenidae) na lagoa do Piató, Assu, Estado do Rio Grande do Norte, Brasil

2009; Editora da Universidade Estadual de Maringá (Eduem); Volume: 31; Issue: 3 Linguagem: Inglês

10.4025/actascibiolsci.v31i3.2140

1807-863X

Simone Almeida Gavilan Leandro da Costa, Danielle Peretti, José Egberto Mesquita Pinto Júnior, Maria Aparecida Fernandes, Antonio Maria Gurgel Júnior,

Ichthyology and Marine Biology

The diet and seasonal variations in the feeding of Plagioscion squamosissimus were evaluated. Fishes were captured monthly at the Piató Lagoon, Assu, Rio Grande do Norte State, from August of 2004 to July of 2005, examined at a specific time of day. In laboratory, after obtaining the biometric data, fishes were opened and the guts extracted. The stomach contents were analyzed under stereoscopic microscope, and its items were identified and their volume was measured. Occurrence and volumetric frequencies and the food index were calculated. The items were grouped in seven main categories; shrimp and insects were predominant. The item classification made it possible to classify the species as carnivorous with carcinophagous-insectivore tendencies. In respect to seasonal variations, an alteration of the main items was observed according to the seasons, where insects prevailed in the dry season and shrimp stood out in the rainy season. In regards to capture periods, a twilight-nocturnal habit was observed, and activity periods are also marked by differences in the food type consumed, as shrimp prevailed in lower light and insects in brighter times.