The Astyanax janeiroensis lives in the demersal, freshwater environment.
Longitudinal segregation of Astyanax janeiroensis in Rio Ubatiba: a Neotropical stream of south-east Brazil pp. 231-234(4) Authors: Mazzoni, R.; Schubart, S. A.; Iglesias-Rios, R. More
Aspects of the reproductive biology of Astyanax janeiroensis in the Ubatiba river in Maric More