It is not difficult to distinguish between male and female zebrafish: the male zebrafish has a slender body, large fins, yellowish body color, brown buttocks and obvious stripes; The female fish is fatter, lighter in color, bluer and yellower in anal fin, and the abdomen of the fish is obviously swollen during pregnancy. Aquaculture water requires pH6.5-7.5, hardness 6-8 and water temperature 25-26 degrees Celsius. Like to lay eggs at the bottom of the aquarium, zebrafish like to eat their own eggs. Generally, you can choose a parent fish of 6 months old. Spread a layer of nylon mesh board or pebbles on the bottom of a square cylinder of 25cm×25cm, and after cultivation, it will fall under the mesh board or be scattered in the cracks of pebbles. Choose 2~3 pairs of parent fish and put them into the culture pond at the same time. Generally, the spawning ends from dawn to the next morning around 10, and the parent fish is taken out. Its eggs are not sticky and fall directly to the bottom of the tank. By about 10 at night, the unfertilized fish eggs are white and can be sucked out with a straw. When the water temperature is 24℃, the fertilized eggs hatch into larvae within 2~3 days. When the water temperature is 28℃, the fertilized eggs hatch into larvae after 36 hours. Female fish lay more than 300 eggs at a time, as many as thousands. When the water temperature is 25℃, the larvae of 7~8 days old begin to eat, then feed them with egg yolk gray water, and then feed them later. The breeding cycle of zebrafish is about 7 days, and it can breed continuously for 6-7 times a year, with high egg production. It is very fertile and is the first choice for beginners to raise tropical fish.