Resumo
Seasonal variation of food items of Bairdiella ronchus (Cuvier, 1830) classified by size was analysed based on monthly samples between september/1993 and september/1996 at the Guaratuba Bay, Southern Brazil. The stomach contents of a hundred eighty-two fishes were analysed by the Occunence Frequency Method and Point Count for a Lot Method. The individuais were divided in two groups, smaller and longer than 140mm, and a comparative study of digestive tract and branchial are was performed for these groups. For fishes smaller than 140mm the following sequence of items was obtained matching both methods by using the Preponderance índices: decapods (subdivided in Brachyura, Caridea and Penaeidea), polychaets, isopods, fishes, unidentified material, copepods, amphipods, molluscs and plant material. For fishes longer than or equal to 140mm the sequence was decapods, polychaets, fishes, copepods, amphipods, isopods, molluscs and plant material, in this order. These results suggest that Bairdiella ronchus at the Guaratuba Bay is a carnivorous species using mainly decapod crustaceans as food throughout the year.
Diet; Bairdiella ronchus; Sciaenidae; Guaratuba Bay
Diet; Bairdiella ronchus; Sciaenidae; Guaratuba Bay
Alimentação de Bairdiella ronchus (Cuvier) (Perciformes, Sciaenidae) na Baía de Guaratuba, Paraná, Brasil1 1 Contribuição número 991 do Departamento de Zoologia, Universidade Federal do Paraná. Trabalho relizado com recursos do CNPq e FUNPAR.
Feeding of Bairdiella ronchus (Cuvier) (Perciformes, Sciaenidae) at the Guaratuba Bay, Paraná, Brazil
Ana Lúcia VendelI,II; Paulo de Tarso da Cunha ChavesI,III
IDepartamento de Zoologia, Universidade Federal do Paraná. Caixa Postal 19020, 81531-990 Curitiba, Paraná, Brasil
IIBolsista do PIBIC/CNPq. E-mail: analucia@aica.cem.ufpr.br
IIIBolsista do CNPq. E-mail: poissons@cce.ufpr.br
ABSTRACT
Seasonal variation of food items of Bairdiella ronchus (Cuvier, 1830) classified by size was analysed based on monthly samples between september/1993 and september/1996 at the Guaratuba Bay, Southern Brazil. The stomach contents of a hundred eighty-two fishes were analysed by the Occunence Frequency Method and Point Count for a Lot Method. The individuais were divided in two groups, smaller and longer than 140mm, and a comparative study of digestive tract and branchial are was performed for these groups. For fishes smaller than 140mm the following sequence of items was obtained matching both methods by using the Preponderance índices: decapods (subdivided in Brachyura, Caridea and Penaeidea), polychaets, isopods, fishes, unidentified material, copepods, amphipods, molluscs and plant material. For fishes longer than or equal to 140mm the sequence was decapods, polychaets, fishes, copepods, amphipods, isopods, molluscs and plant material, in this order. These results suggest that Bairdiella ronchus at the Guaratuba Bay is a carnivorous species using mainly decapod crustaceans as food throughout the year.
Key words: Diet, Bairdiella ronchus, Sciaenidae, Guaratuba Bay
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AGRADECIMENTOS. Aos colegas Jayme de Loyola e Silva, Janete Dubiaski Silva e Ronny Scheffler de Moura, da UFPR, pela colaboração prestada na identificação de isópodes, crustáceos e poliquetas, respectivamente. Ao professor Zavala-Camin, por diversas críticas construtivas.
Recebido em 20.I.1997; aceito em 06.V.1998.
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Datas de Publicação
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Publicação nesta coleção
10 Jul 2009 -
Data do Fascículo
1998
Histórico
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Aceito
06 Maio 1998 -
Recebido
20 Jan 1997
