Ternesia (Gymnocorymbus ternetzi) Boulenger, 1895.
Family characide (Characidae).
Inhabit the basins of the river Paraguay and Rio Negru.
The body is moderately elongated, rather high, egg-shaped, strongly flattened laterally, the lateral line is full. There is a fat fin.
The tail fin is two-bladed.
The back is olive-green, the side is silvery with shine yellowish to bluish color. In front of the body, 3 black transverse bands (through the eye, behind the gill cover and from the beginning of the dorsal fin), which become gray with age.
In young fish, the back of the body, dorsal, anal and fatty fin are black.
The male can keep black color, tail fin with whitish tip. The female is larger.
Breeders brought a white and veil form with elongated fins.
Peace-loving, schooling fish, keep in the middle layer of water, it is recommended to keep in a flock, at least 6 individuals.
You can keep in the general aquarium, sometimes overgrown plants. Water: 22-26 ° C, dH up to 18 °, pH 6.5-7.5 (R.
Riel, X. Bensch give: dH up to 30 °, pH 5.8-8.5), clean, partially replaced weekly.
Food: live, substitutes.
They prefer small live food (moth, pipe maker, carriage, enkhitreyu, daphnia, cyclops). It also eats frozen and dry food. It is also recommended to include feeds of plant origin in the diet of fish – up to 15%
It is recommended to give food at the surface and in the water column, which fell to the bottom is not eagerly eaten.
Spawning aquarium from 80 cm in length, with a separator grid and shrubs of small-leaved plants that should not reach the water surface by 5-6 cm.
Water: 26-28 ° С, dH up to 8 °, КН up to 2 °, pH 6.5-6.8, fresh, level 15-20 cm, aeration.
A couple or a group with a predominance of males (females in the morning, males in the evening) are planted for spawning. The female throws up to 1000 eggs on plants.
Fish are removed, they eat fry and caviar.
The incubation period is 20-30 hours, the fry swim in 3-4 days.
Starter feed: ciliates. Malkov sort by size – cannibalism.