Ictiofauna de um trecho de Igarapé do Mato Grosso usado como balneário em Novo Airão, Amazonas

Abstract

In the Amazon basin, the mainland streams are poor in nutrients and receive little light due to dense forest cover, but they support an ichthyofauna rich in terms of species diversity. These stretches of water are commonly used for various anthropic activities of the population of nearby cities, including for recreation, such as resorts. Due to suffering anthropic action, a survey on the ichthyofauna of these sites becomes necessary, since it collaborates for the knowledge and preservation of the species found. Therefore, the objective of this work was to identify the fish species from the Mato Grosso stream 22 km from the Manacapuru-Novo Airão highway and to verify the most abundant and rich groups. A total of 1409 specimens of 38 species of fish were collected in both rainy and rainy seasons in 2018, day and night, totaling four collections with an effort of four hours each. Several collection instruments were used and the most diverse and abundant groups were Characiformes with 20 species and 1258 specimens, Gymnotiformes with eight species and 54 specimens and Siluriformes with seven species and 46 specimens. The species found are similar to those of preserved igarapés, which might indicate a low influence of the antropic activity in the composition and richness of this ichthyofauna.