Espectro alimentar e varia o sazonal da dieta de Plagioscion squamosissimus (Heckel, 1840) (Osteichthyes, Sciaenidae) na lagoa do Piat車, Assu, Estado do Rio Grande do Norte, Brasil = Food spectrum and seasonal variation of the diet of Plagioscion squamosissimus (Heckel, 1840) (Osteichthyes, Sciaenidae) in Piat車 Lagoon, Assu, Rio Grande do Norte State, Brazil

作者：Simone Almeida Gavilan Leandro da Costa; Danielle Peretti; Jose Egberto Mesquita Pinto Junior; Maria Aparecida Fernandes

来源：Acta Scientiarum - Biological Sciences, 2009.

• Plagioscion squamosissimus
• alimenta o
• agua doce
• indice alimentar
• Plagioscion squamosissimus
• feeding
• freshwater
• food index

Avaliaram-se a dieta e as varia es sazonais na alimenta o de Plagioscion squamosissimus, capturados mensalmente, na lagoa do Piat車, Assu, Estado do Rio Grande do Norte, entre agosto de 2004 e julho de 2005, com despescas em hor芍rios espec赤ficos. Em laborat車rio, ap車s a biometria, os peixes foram abertos e eviscerados. Sob microsc車pio estereosc車pico, analisaram-se os conte迆dos estomacais, cujos itens, depois de identificados, tiveram o seu volume medido. Foram calculadas as frequ那ncias de ocorr那ncia e volum谷trica e o 赤ndice alimentar. Agruparam-se os itens em sete categorias principais, e camar o e insetos foram as predominantes. A categoriza o dos itens permitiu classificar a esp谷cie como carn赤vora com tend那ncia a carcinofagia-insetivoria. Quanto 角 sazonalidade, observouse uma alternancia dos itens de acordo com as esta es do ano: os insetos predominaram na esta o seca e o camar o se sobressaiu na esta o chuvosa. Considerando os per赤odos de captura, observou-se h芍bito crepuscular-noturno, e os hor芍rios de atividade tamb谷m s o marcados por diferen as no tipo de alimento consumido, pois o item camar o predominou nas horas de menor luminosidade; o item insetos, nas horas mais claras. The diet and seasonal variations in the feeding of Plagioscion squamosissimus were evaluated. Fishes were captured monthly at the Piat車 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.