The stream fish fauna from the rio Machado basin, Rondônia State, Brazil

By

Casatti, Lilian
Pérez-Mayorga, María Angélica
Carvalho, Fernando Rogério de
Brejão, Gabriel Lourenço
Da Costa, Igor David

Type

Article

Date of Publication

2013-11-1

Original Publication

Check list : journal of species lists and distribution

Volume

9

Series / Issue

Issue: 6

Pages

1496--1504

Subjects

Amazon Basin , Brazil , ichthyofauna , Rondônia , species inventory

Contributed by

Pensoft Publishers

Language

English

Published by

[São Paulo, Brazil] Luís Felipe Toledo 2005-

Identifiers

DOI: https://doi.org/10.15560/9.6.1496

 

Abstract

The rio Machado (also known as Ji-Paraná) is a tributary of the rio Madeira in the Amazon basin. Currently, the rio Madeira contains the greatest fish species richness of the world, with approximately 1,000 species. The present study presents the fish inventory from streams of the rio Machado basin. In total, 75 stream reaches, 80 meter-length, randomly selected, were sampled in 2011 (August to October) and 2012 (June to July). Overall, 22,875 fish in eight orders, 32 families, 89 genera, and 140 species were collected. Richness estimators indicate that almost 90% of the expected richness was registered. The great majority of specimens (52.2%) was represented by small sized piabas such as Serrapinnus aff. notomelas, Moenkhausia collettii, Serrapinnus microdon, and Hemigrammus melanochrous. Of the total richness, 25 species were restricted to 9°00’ S and 10°00’ S; among them, 14 were exclusive to the lower portion of the basin, which exhibits the larger proportion of native vegetation covering.