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Tetras and alike

Gymnocorymbus ternetzi
Black tetra

Scientific name:
Gymnocorymbus ternetzi
Former scientific name:
Tetragonopterus ternetzi
Moenkhausia ternetzi
Common Names:
Black tetra
Natural habitat:
Bolivia, Brazil and Argentina.

Photo © Mark Smith
Omnivore. Eats in aquariums all standard food.
It is a highly productive species and is an egg-scatterer among plants. Being an egg-scatterer, it is best bred in a special breeding aquarium from which the breeding fishes are moved immediately after spawning. The fry hatch after about a day and are easy to breed.
The Black tetra is a peaceful shoaling fish that fits in most communitytanks. It thrives in most aquariums and makes no major demands on the interior of the aquarium, although the aquarium can gladly contain some plants and have a not too bright bottom.
It is a very common aquarium fish and its popularity is mostly due to the very intense black color of juveniles (mainly on the fins). Unfortunately, older specimens lose the black colour and become more grayish (the photo above shows an older specimen).
The anal fin of the male is wider than that of the female, in addition, the dorsal fin of the male is narrower and more pointed. Females are slightly rounder, in addition, her anal fin seam runs more parallel to the abdominal line.
If one has few of this species, they can sometimes begin to bite a little on the fins of fish with long fins. Photo 2 shows the white form of this species and it is likely a breeding form.

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