1, koi fish is a freshwater fish, so strictly speaking, there is no need to add salt to the water raised in koi fish. But salt is also used in the process of raising koi fish. First of all, salt has the function of sterilization, because there will be some germs in the fresh water that we change in the fish tank. If we want to reduce the germs, we can put salt in the water, and then we can try to put a certain proportion of salt into koi fish's treatment of bacterial diseases. Secondly, salt can also be used in the process of cleaning, sterilization and disinfection of fish tanks. Salt can also stimulate the physiological regulation function of fish to enhance immunity; It can also enhance the vitality and appetite of fish, make it more energetic and stabilize the mood of fish.

2. What salt to put: industrial salt, that is, large-grain salt, also known as raw salt, is crystallized in the salt pond. Because it is used in industry, it has not been processed. Because the content of sodium chloride in industrial salt is relatively low, the others are impurities. These impurities are usually composed of sodium sulfate, heavy metals, toxic substances, minerals (mineral salts), etc., and their toxicity is very strong. Humans can be chronically poisoned after eating by mistake, not to mention fish. Therefore, it is not recommended. It is better to use crude salt, which is generally found in fish markets. Crude salt can be divided into sea salt, mineral salt and well salt according to the origin. It is not recommended to put edible salt, because there is iodine in it, which will harm the fish. If there is no crude salt, edible salt can be used, but it should not be used often. When it is urgent, salt can be added, and it is best to remove the iodine in the salt.

3. How much salt to put: Generally, you will grab a few handfuls at hand, and you will not add them in strict accordance with the percentage. However, the harm of doing so is that adding less will not play its due role; Adding too much will cause some water loss and make salt penetrate into the blood, leading to dehydration. The correct amount is five thousandths, 1000 Jin of water and five Jin of sea salt.