Notes on the feeding habits of the skate Rioraja agassizi (Chondrichthyes, Rajidae) off southeastern Brazil
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Data
2011-06-30
Autores
Pasquino, Aline F. [UNESP]
Vaske-Junior, Teodoro [UNESP]
Gadig, Otto Bismarck Fazzano [UNESP]
Barreiros, Joao P.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Soc Francaise D Ichtyologie
Resumo
Feeding habits of the skate Rioraja agassizi were analyzed in southeastern Brazil from samples obtained along Silo Paulo coast. A total of 258 specimens were examined, ranging between 96 and 532 mm total length. About 57.85% were females and 42.15% were males, resulting in a 1:1.37 sex-ratio to females. From 223 stomachs collected (94 males and 129 females) empty stomachs represented only 1.4%. Nine prey categories were identified: Polychaeta, Copepoda, Cumacea, Isopoda, Gammaridea, Dendrobranchiata, Brachyura, Teleostei, and one non-animal category (non-identifiable items). Crustaceans were the most important item, indicating that the species has a carcinophagic preference. The presence of fish was just verified in juveniles and some adult individuals, with predominance in summer. Sex, maturity stage and seasonality did not influence the feeding habits of the species.
Descrição
Palavras-chave
Rajidae, Elasmobranch, Rioraja agassizi, SW Atlantic, Trophic ecology
Como citar
Cybium. Paris: Soc Francaise D Ichtyologie, v. 35, n. 2, p. 105-109, 2011.