Alimentação e fator de condição de peixes characidiíneos no sistema do Ribeirão Grande, Sudeste do Brasil - DOI: 10.4025/actascibiolsci.v27i3.1336

Francisco Manoel de Souza Braga

doi:10.4025/actascibiolsci.v27i3.1336

Feeding and condition factor of characidiin fish in Ribeirão Grande system, Southeastern Brazil - DOI: 10.4025/actascibiolsci.v27i3.1336

Authors

Francisco Manoel de Souza Braga Unesp Rio Claro Author

DOI:

https://doi.org/10.4025/actascibiolsci.v27i3.1336

Keywords:

Characidium lauroi, Characidium alipioi, alimentação, fator de condição, sistema do Ribeirão Grande, ecologia de riacho

Abstract

Feeding, seasonal changes in visceral fat and condition factor were compared in two species of characidiin fishes, Characidium lauroi and C. alipioi from Ribeirão Grande system, southeastern Brazil. Five streams of Ribeirão Grande system were sampled (22o 47’ 08’’ S, 45o 28’ 17’’W). The samples were taken four times per site, from July, 2001 to April, 2002: winter (July 2001), spring (October 2001), summer (February 2002) and autumn (April 2002). Quantitative collections were made with an electro-fishing device powered by a generator with maximum capacity of 1,500 V and 8.7 A of 60 Hz alternating current. Ephemeroptera nymphs, Diptera larvae (Chironomidae, Simuliidae), Plecoptera nymphs, Trichoptera larvae (Hydroptilidae, Psychoyiidae), terrestrial insects (Coleoptera, Isoptera, Hemiptera [Heteroptera, Homoptera]), Megaloptera larvae (Corydalidae), Arachnida, Ostracoda and vegetal debris were found in both species’ diets. Visceral fat declined in February, coinciding with the decline of the condition factor in both species. The increased feeding from summer to fall provides fat accumulation. During subsequent seasons, fish may utilize visceral fat reserves for maintenance and reproduction

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Author Biography

Francisco Manoel de Souza Braga, Unesp Rio Claro

Possui graduação em História Natural pela Faculdade de Filosofia Ciências e Letras de Rio Claro (Instituto Isolado) (1973), mestrado em Oceanografia (Oceanografia Biológica) pela Universidade de São Paulo (1978) e doutorado em Oceanografia (Oceanografia Biológica) pela Universidade de São Paulo (1982). Em 1995 prestou concurso para professor livre-docente, tornando-se professor adjunto e em 2005 tornou-se professor titular por concurso pela Universidade Estadual Paulista Júlio de Mesquita Filho. Tem experiência em biologia pesqueira de peixes marinhos e continentais e atualmente tem trabalhado em biologia populacional e ecologia de peixes de riachos.

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Published

2008-03-26

Issue

Vol. 27 No. 3 (2005)

Section

Ecology and Limnology

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How to Cite

Feeding and condition factor of characidiin fish in Ribeirão Grande system, Southeastern Brazil - DOI: 10.4025/actascibiolsci.v27i3.1336. (2008). Acta Scientiarum. Biological Sciences, 27(3), 271-276. https://doi.org/10.4025/actascibiolsci.v27i3.1336