Girardinus are the only viviparous representatives belonging to the order of cyprinids.
They live in medium-sized fresh or salty, but always with running water, reservoirs located in the southern part of Brazil, Argentina, Uruguay, Paraguay.
Girardinuses are the tiniest among the rest of the order of the cyprinids. The male is inferior in size to the female, growing up to a maximum of 2.5 cm in length, and the female individual can reach 6 cm. Their body shape is elongated, flattened on their sides.
Most often, these fish are painted in yellow or gray-silver color with black uneven spots on the whole body, the amount of which increases as the water in which they stay is cooled.
In males, in comparison with other fish, they have a narrow and long throat, and therefore it is necessary to carefully choose food. Girardinus should eat both live food and herbal supplements (spinach, algae, lettuce, which must be dipped in boiling water in advance). You can also enter in their diet and dry food. They can eat moss growing on pebbles taken from natural bodies of water.
Maintenance and care
The most suitable water temperature in the aquarium varies between 18-20 degrees. Daily it is necessary to partially renew the water, it is allowed to add some salt. Girardinus prefer to live in packs. When calculating the volume of the required aquarium, it should be borne in mind that one pair requires 3 liters of water.
The breeding is quite simple, the same as the rest of live-bearing fish such as Guppies, Molynezia, Swordsmen.