? The medaka can reproduce when they are adults. They are generally about 4-6 months of adulthood, but the specific time of adulthood depends on the breeding environment and the constitution of the medaka, if the breeding environment is better, they can be adult in about 4 months. If they are kept in a poor environment, they need six months to reach adulthood.
If the breeding environment is poor, they are also prone to illness, and the frequency of illness becomes higher, which will affect their life span. If breeders want them to breed as soon as possible, they can ensure the stability of water temperature and water quality. Although they have strong adaptability, they are sensitive to changes in the environment, so they should ensure the stability of the surrounding environment at ordinary times.
? When the medaka breeds, the ventral fins of the male fish will appear obviously black, and there will be a black line between the two eyes on the top of the head. Moreover, they will occupy the territory. If the female fish is not in heat, it will drive forward the male fish occupying the territory. If the female fish is already pregnant, it will come forward to mate. The female lays eggs once every 2-3 days, 10-20 eggs each time, and the eggs can hatch in about 8-14 days. The diameter of the eggs is about 0.1 cm, and the length of the hatched fish is 0.3 cm.
