1. Mating: If a male and a female zebrafish are chasing bites, they may be mating. Because zebrafish are fertilized in vitro, when breeding, male fish will keep chasing female fish. During the chase, the female fish will produce eggs and the male fish will also discharge sperm. At this time, breeders need to ensure that their living environment is quiet, and don't let too much noise disturb their reproduction.

2, fight: If the same-sex zebrafish are chasing, it may be fighting for territory. Although they are gentle in character, they rarely fight. However, if they don't have enough living space, there may be fights. Breeders need to reduce the density or keep them separately.

Zebrafish will not attack other fish under normal breeding, because they are gentle in character and have strong adaptability to the environment, swimming in the fish tank all day long. As long as they have enough living space and food, they can survive well.

However, when food is scarce or living space is insufficient, they will also have conflicts with other fish. However, their aggressiveness and attack power are not strong, and generally there will not be too many casualties.