1. Oxygen deficiency: The biggest possibility of koi fish death is oxygen deficiency. This kind of fish is very large, so it has a high demand for oxygen. If there is not enough oxygen, the fish will float at first and die after a long time. Usually, if it is raised artificially, it is best to prepare an oxygen pump to oxygenate the fish tank 24 hours a day.
2. Water quality deterioration: No matter what kind of fish lives in water, the quality of water also has a great impact on its health, and the deterioration of water quality will also threaten the survival of koi fish. Usually, in order to maintain the water quality, it is necessary to change the water regularly, usually every five to seven days, each time about a quarter of it is changed.
3, can't move: If the fish tank is small, koi can't move, and it will get sick after a long time, and its resistance will drop or even die. In view of this situation, it is necessary to change a larger fish tank with a length of at least 1 meter and a width of not less than 60 cm.
2. Can koi fish be raised in fish tankKoi fish can be raised in fish tank. However, it is best to use a larger fish tank, and to use an oxygen pump to oxygenate the fish tank 24 hours a day, so as to ensure the healthy growth of fish. Food can be fed two or three times a day, and it is advisable to finish each feeding in about 5-10 minutes.