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Acta Limnologica Brasiliensia

versão impressa ISSN 0102-6712versão On-line ISSN 2179-975X

Resumo

OLIVEIRA, Jean Carlos Dantas de et al. Does the oscillation of the water volume of the reservoir influence in the same way in fish diet?. Acta Limnol. Bras. [online]. 2018, vol.30, e104.  Epub 16-Abr-2018. ISSN 0102-6712.  http://dx.doi.org/10.1590/s2179-975x9216.

Abstract

Aim: To evaluate the fish feeding and to establish the preferential and secondary items of their diets, to determine the trophic guilds and the possible trophic structure variations in function of the water volume in Umari reservoir, Rio Grande do Norte, Brazilian semiarid.

Methods

The fish were captured quarterly between February and November of 2013, with gill nets with different meshes, being the apparatuses exposed at 5:00 p.m., with removal at 5:00 a.m. The food items were identified using stereoscopic and optical microscopes and evaluated through the Feeding Index (IAi), being the results of this procedure used in food similarity analysis. The volume of the items was orderly in NMDS and the time differences were tested in PERMANOVA.

Results

A total of 740 individuals belonging to 14 species were sampled, being analyzed a total of 258 stomachs and 8 intestines of 11 species. From the IAi values used in the trophic similarity analysis, the species were classified into five trophic guilds: detritivorous, insectivorous, malacophagous, carcinophagous and piscivorous.

Conclusion

The oscillation in the water volume of the reservoir did not influence the diet of the guild detritivorous, which shows that the variations in the volume of water of the reservoir do not influence in the same way the diet of the local ichthyofauna.

Palavras-chave : feeding; trophic guilds; ichthyofauna; semiarid.

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