Reavaliação da composição e abundância da ictiofauna após décadas da introdução de piscívores na Lagoa Dom Helvécio, Parque Estadual do Rio Doce, MG

Abstract

The abundance and composition of fish fauna were assessed in a lake in Rio Doce State Park (19º 45’S 19º 30’S e 42º 38’W 48º 28’W) three decades after the introduction of exotic piscivorous. Gillnets with mesh ranging from 3-16 cm between opposites knots were used in 20 sites of the lake on October 18th and 19th of 2014. A total of 128 individuals of five different fish species were captured and the non-native red-bellied piranha (Pygocentrus nattereri) was one of those species. There has been a progressive decrease in the richness of native species, and also a change in the relative abundance of these species. Those are probably consequences of the high abundance of P. nattereri in this lake.