1.5 kg of salt should be put into one ton of water in the fish pond. Usually, the concentration of salt is between one thousandth and four thousandths. This salinity will not cause any harm to fish, so they can be kept in it for a long time. If the salt is too high, the osmotic pressure of water body is higher than that of fish body, and water will be separated out from the body, which will eventually lead to dehydration and death of fish.

1. What salt to use: To put salt into the fish pond, we must first choose the right salt. There are many kinds of salt. Generally, we come into contact with edible salt, also known as refined salt. The refined salt contains high iodine. Although this substance is beneficial to people, it is really bad for the development of fish, so it is recommended to use crude salt.

2, mixed into solution: Salt cannot be directly poured into the fish pond, so on the one hand, the concentration is uneven, on the other hand, it will also affect the health of fish. Usually, crude salt should be mixed into solution first, and a proper amount of water in the pond should be taken, and the salt should be poured into it to melt before the solution can be poured into the fish pond.

3. Precautions: Because salt has advantages and disadvantages, don't use it easily, especially in the pool where aquatic plants are planted, otherwise it will cause aquatic plants to turn yellow. In addition, we should pay attention to the dosage. Once it exceeds the standard, it will also be harmful to the health of fish.