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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Rev. Bras. Zool. vol.15 no.4 Curitiba Dec. 1998

http://dx.doi.org/10.1590/S0101-81751998000400018 

Feeding of holoshesthes Heterodon eigenmann (Teleostei, Cheirodontinae) of the cajuru reservoir (Minas Gerais, Brazil), in relation to the vegetal biomass on its depletion zone

 

 

Márcio Camilo Carvalho AlvimI; Paulina Maria Maia-BarbosaII; Carlos Bernardo Mascarenhas AlvesIII

IPós-graduação em Ecologia e Recursos Naturais, Universidade Federal de São Carlos. Caixa Postal 676, 13565-905 São Carlos, São Paulo, Brasil
IIDepartamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais. Caixa Postal 486, 31270-010 Belo Horizonte, Minas Gerais, Brasil
IIIDepartamento de Zoologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais. Caixa Postal 486, 31270-010 Belo Horizonte, Minas Gerais, Brasil

 

 


ABSTRACT

Stomach contents of Holoshesthes heterodon Eigenmann, 1915 (Teleostei, Cheirodontinae), collected in the depletion zone of Cajuru reservoir when it was at its maximum water level in two stations with different vegetal densities, were studied in order to investigate the influence of the flooded vegetal biomass on the food quantity and quality ingested by fish. Eighteen individuals from each station were examined. The standard length was l.53±0.05 cm and l.52±0.05 cm, respectively at the lower biomass (8.19 kg diy weight/ha) and higher biomass (38.10 kg diy weight/ha) sampling stations. The stomach repletion Index (SRI) was applied for the quantitative analysis. The alimentary index (IAi) was used for the quali-quantitative analysis, with the volume of the items obtained through the points method. SRI did not show values significatively different between the two stations, p>0.05, by applying the Mann-Whitney test. In both situations, Cladocera was the most important item. There were no correlation between the flooded vegetal biomass in the depletion zone and the intake of food by H. heterodon. However, as there were no empty stomachs, possibly even the lower vegetal biomass was enough to provide abundant feeding resources.

Key words: Fish feeding, reservoir, depletion zone, water level, vegetal biomass, Holoshesthes heterodon.


 

 

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ACKNOWLEDGMENTS. We acknowledge the Companhia Energética de Minas Gerais (CEMIG) for the logistic support for the collections and the Post-graduate Program in Ecology and Natural Resources of the Federal University of São Carlos (UFSCar) for financing the translation of this article into English. We also thank Luiz Roberto Malabarba (Museu de Ciências da PUCRS) for the species identification, and the two anonymous referees for the useful suggestions made on the manuscript.

 

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Recebido em 19.IX.1997; aceito em 19.XI.1998.

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