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Its diet depends on age: juveniles eat aquatic insects while adults feed on terrestrial and aerial insects. It is viviparous: the gestation lasts about 24 days. The female can give birth to about 30 fry.

The male is much smaller and more colorful than the female. It is an ovoviviparous species, the male fertilizes it partner through its anal fin which forms a kind of gutter. It is the most popular aquarium fish, there are many varieties.

The female is larger than the male. Fertilization is internal and it is an ovoviviparous species. After a "gestation" of 28 days, the female "gives birth" to a variable number of juveniles: between 20 and 150. There are many varieties of color, the most common is black.

The female is larger than the male. It is an ovoviviparous species: the male fertilizes it partner through an oviduct. The eggs hatch in the body of the female, where they complete their development. Each female gives birth to 10 or 20 juveniles. It easily accommodates to life in the aquarium, but it may chew on plants and be aggressive towards other fish species.