An annotated list of the freshwater fishes of the Limoncocha Lagoon, in the Limoncocha
Biological Reserve in the northern Amazon region of Ecuador is presented. Fishes were
captured between March and July of 2012, and we combined these results with previous
studies to provide a comprehensive list of fishes in the Limoncocha Biological Reserve.
Thirty-three species belonging to 14 families distributed in 7 orders were collected.
The most representative orders in number of species and specimens were Characiformes,
Siluriformes, and Perciformes, respectively, being Characiformes as the most important
in terms of richness and abundance of species. Characidae (Characiformes) exhibited
the greatest abundance and broadest distribution in our samples. A short morphological
description and morphometric measurements of each species are also presented.