freshwater
Red Eye Tetra
Moenkhausia sanctaefilomenae
Deep, compressed body shape typical of tetras with a silvery coloration and distinct red pigmentation on the upper half of the iris. They have a dark band on the caudal peduncle followed by a white fringe. They typically reach about 7 centimeters in length.
- Habitat
- Native to freshwater streams, rivers, and flooded areas…
- Size & weight
- Typically grows to around 7 cm (2.8 inches) in length wi…
- Diet
- Omnivorous, feeding on small insects, crustaceans, worms…
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Physical characteristics
Deep, compressed body shape typical of tetras with a silvery coloration and distinct red pigmentation on the upper half of the iris. They have a dark band on the caudal peduncle followed by a white fringe. They typically reach about 7 centimeters in length.
Habitat & distribution
Native to freshwater streams, rivers, and flooded areas in South America, particularly the Paraná and São Francisco river basins.
Behavior
Active, schooling freshwater fish that are generally peaceful, though they can be slightly fin-nipping if kept in too small of a group.
Diet
Omnivorous, feeding on small insects, crustaceans, worms, and plant matter.
Reproduction
Egg scatterers that do not exhibit parental care. Females release eggs among fine-leaved plants where males fertilize them.
Ecological role
Acts as both a predator of small aquatic invertebrates and prey for larger carnivorous fish and birds in its native ecosystem.
Similar species
Other tetra species such as the Buenos Aires Tetra, but can be distinguished by the striking red upper eye and the dark patch on the tail base.
Identification tips
Look for the bright red upper half of the eye and the characteristic dark horizontal patch at the base of the tail.
Interesting facts
Their glowing red eyes are a natural adaptation that helps them signal to other members of their school in murky waters.