Alimentação e impactos da espécie exótica bagre-africano (Clarias gariepinus Burchell,1822) no estuário do rio Itanhém, Bahia / Feeding habits and impact of the alien species African catfish (Clarias gariepinus Burchell, 1822) in Itanhaém River estuary, Bahia.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

This work was developed in order to investigate the impact of the alien species Clarias gariepinus in the Itanhém River comparing to the adjacent Caravelas River, where this species does not occur. A total of 214 stomachs from C. gariepinus, Centropomus undecimalis, C. parallelus were analyzed. In Caravelas River, Brachyura was the main food item for C. parallelus, and Teleostei for C. undecimalis. In Itanhém River, shrimp was the most important food for C. gariepinus, and Teleostei for C. parallelus. There was no food overlap between the species within and among rivers. To characterize the fish fauna, 915 individuals and 2,644 were captured in Caravelas and Itanhém Rivers, respectively. Diapterus auratus was the most important species in Caravelas, while Stellifer naso in Itanhém. Seasonal variability on fish fauna was related to salinity. Twenty-nine questionnaires were applied to the local fishermen in order to evaluate the impact of the Clarias gariepinus introduction on the ecosystem and fishery. The main problems reported were that the C. gariepinus has no commercial value, they prey on shrimp, and the decreasing profit from fishery. There is no evidence of changes in the Centropomus parallelus population induced by the alien species, despite of its economic impact.

ASSUNTO(S)

impact bahia cetropomus cetropomus clarias gariepinus bahia clarias gariepinus dieta impacto alien species diet espécie exótica

ACESSO AO ARTIGO

Documentos Relacionados