Estrutura da Ictiofauna após a mudança de lótico para lético no baixo rio são Bartolomeu, Goiás Brasil.

Abstract

INTRODUCTION: The relevance of works aimed at the conservation and migratory of the planet’s biological diversity has been strongly emphasized in various media, such as politics and scientific. OBJECTIVE: The present study aims to observe if there was any displacement of Ichthyofauna species in the lower Rio Bonito due to change from lotic to lentic. METHODOLOGY: For a better characterization of the ichthyofaunal, six general sample sections were determined (TMB1, TMB2, TMB3, TMB4, TMB5 e TMB6). For this study of the ichthyofaunal in the six (6) points, the geomorphological characteristics of the local water netwok were considered, such as channel width and total depth. In this case, it was decided to use waiting nets, trawl nets, casts nets, sieves and interview with dwellers ribeirinho. RESULTS: The results obtained in this study, totaled one hundred and six specimens representing twenty species, with fifteen genera in ten families and three orders of the Class Anctinopterygii. The order characiformes represented 13 of the species Siluriformes 4 species and the order Cichliformes 3 species. The most abundant species were Hypostomus regani, Astianaxy bimaculatos, 20 Pimelodus maculatus with 13, Astyanax fasciatus with 9, Leporinus friderici and Serrasalmus fallowed by Hypostomus plecostomus and Coptodonrendalli 4 each species, Schizodon altiparanae and Prochilodus lineatusi wich represented 3 species. The Omnivorus fish, together with detritivores, together represent an exact 75.000% of the ichtyofauna recorded in the study. Of the 20 species recorded, 7 species have some type of significant movement to be considered as migratory. CONCLUSION: In projects in the electricity sector where the main impact is the formation of a reservoir, the concern is increased, in view of some particularities such as the determining factors such as possible interference in the migration routes of rheophilic species, as well as changes in lotic to lentic environments thus being able interfere both negatively for some taxons and positively for others. Due to the change from lotic to lentic, it was observed that it did not interfere in the ichthyofauna community, specially for migratory species.