Fin's Fish Guide
The Rio tetra (Astyanax janeiroensis) is a fish of the family Characidae that grows up to 10 cm.
Description
The Rio tetra is a characin (Characidae) from clear streams and rivers of southeastern Brazil. The species grows to about 10 cm and has a slender, laterally compressed, silvery body with an adipose fin and often a dark tail or shoulder spot. As a social schooling fish it swims in the middle and upper layer and snaps at insects, larvae, small invertebrates and plant matter. The fish is harmless to humans.
Frequently asked questions
How do you recognise the Rio tetra?
The Rio tetra is mainly silver-grey.
Where does the Rio tetra live?
The Rio tetra is mostly found around open water.
How big does the Rio tetra get?
The Rio tetra grows to a maximum of about 10 cm.
Is the Rio tetra dangerous to humans?
No, the Rio tetra is harmless to humans. This species is harmless to humans. No specific first aid is needed. Still handle the fish with care: mind the fin rays and the sharp edges of the gill cover, and rinse any scratch with clean water and cover it. For a dirty or deep wound check tetanus status.
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All data
Identification
Appearance
Habitat & distribution
Behaviour & biology
For anglers
Safety
Status & sources
Same genus Astyanax
More from the family Characidae
Want the complete picture on the Rio tetra?
Point your camera at the fish and Fin names the species in seconds. Free, and the Rio tetra is one of 12,519 species in the app.