freshwater
Black Tetra
Gymnocorymbus ternetzi
Distinctive deep, laterally compressed body. Characterized by two vertical black bars on the front of the body and a large, black dorsal and anal fin that gives the fish a 'skirted' appearance. Juveniles are jet black, while adults may fade to a smoky grey.
- Habitat
- Native to the Paraguay and Guaporé River basins in South…
- Size & weight
- Typically reaches an adult length of 5–6 centimeters (2–…
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Physical characteristics
Distinctive deep, laterally compressed body. Characterized by two vertical black bars on the front of the body and a large, black dorsal and anal fin that gives the fish a 'skirted' appearance. Juveniles are jet black, while adults may fade to a smoky grey.
Habitat & distribution
Native to the Paraguay and Guaporé River basins in South America (Brazil, Paraguay, Argentina). Prefers slow-moving rivers, creeks, and subtropical tributaries with plenty of vegetation and overhead cover.
Ecological role
Omnivorus species feeding on small crustaceans, insects, and worms. Plays a role as both a low-level predator of micro-invertebrates and prey for larger river predators. Currently listed as Least Concern by many regional assessments, though not globally evaluated by the IUCN.
Similar species
Black Phantom Tetra (Hyphessobrycon megalopterus) which has a more elongated body and different fin shapes, and the Serpae Tetra which has more reddish coloration.