fish tank changes, the fish body is most likely to turn black. This change is two aspects, one is the aging of water quality, that is, long-term non-change of water, high ammonia nitrogen content in water, water turbidity, at this time to do is to change water in time. The other is the stimulation of new water, indicating that the water is changed too often or too much. Generally, according to the maintenance of the water body, it can be changed once a few days or a week, and only about a quarter of it needs to be changed each time.
, the blackening of the fish body is probably caused by the great change in the temperature of the environment. Usually, the water temperature should not change more than 2 degrees Celsius in a day. If possible, it is better to prepare a heating rod, which can control the temperature well. If you raise tropical fish, the temperature should be kept above 20 degrees Celsius, and wide temperature fish should be avoided in the sun, so as to avoid the temperature difference between day and night affecting the health of fish.
Many diseases can also lead to blackening of the body surface of fish, such as bacterial enteritis, gill rot, hemorrhagic disease and some diseases caused by parasites, which can lead to loss of appetite of fish, affect its digestion and blood circulation, and then lead to the failure of normal activities of pigment cells, which can cause blackening of the body. Especially the head is more obvious.
the blackening of fish in a specific illumination environment, which is a physiological change and usually can not be changed. In order to avoid this situation, it is better to avoid sunlight during the breeding process and provide a special aquarium lamp as a light source.
