A list of fish species that live in a certain body of water or watercourse.

Species composition is the set of individuals with common morphological and physiological-biochemical traits that freely interbreed and produce fertile offspring in a given water body.

Biological systematics of living organisms; a taxonomic, systematic unit, a group of individuals sharing morphophysiological, biochemical and behavioural characteristics, capable of interbreeding and producing fertile offspring in a series of generations, regularly distributed within a given water body.