Put a small flower pot on the side as a breeding nest in the crater fish tank. The water temperature is kept at about 27°C, the water quality is slightly alkaline, and the hardness is about 8 degrees. A quiet environment is required. The broodstock was fished out after spawning. A female fish can lay more than 200 eggs. Fertilized eggs hatched larvae after 4 days.

The appearance of male and female calamus is similar, so it is difficult to identify. Generally, the dorsal fin of male fish is pointed and longer than that of female fish, the fish body is larger than that of female fish, and the color is more bright; the dorsal fin of female fish is shorter and rounded at the end, but its abdomen is enlarged when sexually mature. In the water temperature of 24-28 degrees, do not choose to eat animal bait. Hukou is irascible, not suitable for small and mixed breeding. It is difficult to identify male and female. Careful observation shows that the male fish has a pointed and longer dorsal fin than the female fish, the fish body is larger than the female fish, and the color is brighter. The female fish dorsal fin is shorter and the end is round. The fish body is relatively small and mature. When the abdomen is more swollen, the color is inferior to that of the male fish. Firemouth are oviparous fish and enter sexual maturity at 10 months of age.