Collected from a black-water, terra-firme forest stream about 4-5 m wide and 0.5-1.0 m deep, with a predominantly sandy bottom. Also found in a large oxbow lake (Ref. 81201).
- Marinho, M.M.F. and F.C.T. Lima 2009 Astyanax ajuricaba: a new species from the Amazon basin in Brazil (Characiformes: Characidae). Neotrop. Ichtyol. 7(2):169-174. (Ref. 81201) http://www.fishbase.org/references/FBRefSummary.php?id=81201&speccode=51060