The freshwater fish fauna of South America is the richest continental ichthyofauna on the planet, but when it comes to igarapés, studies on the ichthyofauna are still little known, even though these are the holders of the greatest and most threatened richness. The present study aims to inventory and analyze the fish community of igarapés, specifically of the Taiassuí River Basin, and to correlate it with anthropic impacts. Collections were carried out in three different points of the Taiassuí River and one in the Benfica River between the months of March and November 2006, and January 2007. Complementary data from 2001 and 2003 available at the Museu Paraense Emílio Goeldi (MPEG) were used. The collection methods were trawls and hand nets. The individuals collected were sacrificed and fixed in 10% formalin, preserved in 70% alcohol, and added to the MPEG collection. We analyzed 5,177 individuals belonging to seven orders, 23 families, and 81 species. In the order Characiformes the most representative species were Hemigrammus belottii (Steindachner, 1882) with 19.5% of representation and Hyphessobrycon werneri Géry & Uj, 1987 with 18.9% of the total. In the order Perciformes the most representative species were Apistogramma agassizii (Steindachner, 1875) with 24.5% and Aequidens epae Kullander, 1995 with 8.5%. However, these data are a minority when compared to the magnitude that the study can reach, where the analysis of these veins confirms the lack of knowledge about the richness of the streams and how the impacts can transform it.
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