The black tetra (Gymnocorymbus ternetzi) also known as the black skirt tetra, petticoat tetra, high-fin black skirt tetra, and black widow tetra, is a freshwater fish of the characin family (Characidae). It is native to the Paraguay and GuaporÃ© River basins of southern Brazil, Argentina, and Bolivia.
Growing to about 6Â cm (2.5Â in) total length, the black tetra has a roughly tetragonal body shape and is greyish in colour, fading from near black at the tail to light at the nose. Two prominent, black, vertical bars appear just posterior to the gills. It is a schooling fish, and requires at least six in a group.
The black widow tetra feeds on small crustaceans, insects, and worms.
In the aquarium
The black skirt tetra is a common fish that is widely available for purchase.
Hobbyists often provide live foods such as daphnia and mosquito larvae, and frozen foods like bloodworms.
The species reaches sexual maturity at about two years of age. Like most characins, this species spawns by intermittently releasing and fertilizing eggs among plants. It frequently eats its own eggs, so keepers remove the fish after spawning.
The black phantom tetra (Hyphessobrycon megalopterus) is a separate species. The black neon tetra (Hyphessobrycon herbertaxelrodi) is sometimes also called the black tetras.
GloFish black tetras in shades of bright green, orange, purple, and pink are available.
- List of freshwater aquarium fish species
- Froese, Rainer and Pauly, Daniel, eds. (2004). "Gymnocorymbus ternetzi" in FishBase. October 2004 version.
- "Gymnocorymbus ternetzi". Integrated Taxonomic Information System. Retrieved 5 December 2004.Â
- Innes, W. T. Exotic Aquarium Fishes. T.H.F. Publications, Inc. 1979.