Von Rio Tetra Identification Guide
Recognize the Von Rio Tetra by its red-flushed body and paired black vertical bars behind the gills.
Read the full Von Rio Tetra encyclopedia entry →
Key identification features
- Deep-bodied, laterally compressed tetra reaching about 4 cm in length
- Silvery base tone that flushes progressively more red toward the tail and lower body
- Two distinct vertical black bars positioned just behind the gill cover, a key identifying mark
- Upper half of the eye tinted red, adding to the overall warm coloration
- Red-black edging along the anal fin, with the dorsal fin also carrying a reddish tint
Common look-alikes
- Serpae Tetra: shows a single solid black shoulder blotch rather than two separate vertical bars behind the gills.
- Bleeding Heart Tetra: is larger overall and has one round red blotch on the shoulder instead of the Von Rio's double-bar pattern.
- Flame-type hybrids: sold under similar trade names, but genuine Von Rio Tetras always retain the paired vertical bars as the defining trait.
Where you'll see one
This species is native to coastal streams, lagoons, and slow vegetated waters near Rio de Janeiro in southeastern Brazil, giving rise to its common name, where it schools among plant cover in shallow, warm water.
Frequently asked questions
How do I distinguish a Von Rio Tetra from a Serpae Tetra?
Check the shoulder pattern: the Von Rio Tetra shows two separate vertical black bars behind the gill cover, while the Serpae Tetra has one solid black blotch instead.
What color pattern best confirms a Von Rio Tetra?
A silvery body flushing red toward the tail, combined with two vertical black bars right behind the gills, is the most dependable identification combination.