Oviposition, guppies give birth once a month, depending on the size of the female fish, each time they can give birth to 10- 120 larvae, which is quite a lot in a year, so they are called "millions of fish". When breeding, it should be noted that the fish should not be kept in the same nest for more than three generations, so as to avoid the species degradation caused by continuous inbreeding, making the offspring fish smaller and smaller and the caudal fin shorter. It is best to introduce the same species of fish for purposeful distant hybridization to prevent the degeneration of sub-species and achieve the purpose of improving species. But the life span of guppies is very short, generally only 2-3 years. Generally, the first birth is less, about 10~80; The second child gives birth to about 80~ 120. The price ranges from several yuan to several tens or even hundreds of yuan 1 piece. The peacock fish is also known as rainbow fish, million fish, kubi fish and anchovy. Peacock fish is a tropical freshwater fish with different phenotypes and different body lengths. The adult fish is about 3~5cm long.

Its rich colors, colorful shapes and exuberant fertility are favored by tropical freshwater fish breeders. There are obvious differences between female and male fish. The male fish is rich in color and the tail shape is varied. Peacock fish is the most common and favorite fish in tropical fish. It is small and exquisite, lively and active, and the tail handle and fin of the male fish account for about 2/3 of its length; The tail fin has various shapes, such as piano tail, round tail, flag tail, crown tail, triangle tail, dovetail, upper sword tail, lower sword tail, double sword tail, spear tail, needle tail (different from disease "needle tail") and so on.

The length of female fish can be up to 6 cm, and its tail stalk and fin account for more than 1/3 of the whole body, and each fin is shorter than that of male fish. Compared with the male fish, the body color is much inferior, mostly single silver gray, and although there are some patterns on the tail fin, they are not as bright as the male fish.