1, in order to keep the strain pure, some preparations need to be made: the female fish should be separated from the male fish before sexual maturity, and the male fish and the female fish can be separated immediately after 1 half a month, until they are kept for 2.5 ~3 months. The female fish with good body shape and strong strain characteristics should be selected as the female fish, and 3~4 male fish with strong mature strain should be matched with the female fish. Male and female fish should be from different places, such as inbreeding. After three generations, the strain degradation will be very serious.

2. Avoid inbreeding within three generations, avoid hybridization, and raise in tanks. It will degenerate after three generations. To put it simply, take the peacock bluegrass as an example: two places buy fish, and in the area represented by A and B, A male and B female breed and become the first line. A female and B male breed into another line. If offspring and parents breed more tanks, it will become the first line, so that you can raise at least four-line fish after buying fish in two places, which can ensure the good maintenance of the hybrid strain.

3. Peacock fish, also known as anchovies, rainbow flowers, rainbow fish, peacock fish and so on. It is a tropical fish, belonging to Anthuridae. There is a great difference in size and color between male and female fish. Adult male fish is thin and thin, with a body length of 3-4 cm, gorgeous body color and beautiful body shape. The adult female fish is about 5 cm long, and the tail stalk and fins account for more than 1/3 of the whole body, and each fin is shorter than that of the male fish. It is much worse than the male fish.