1. Do you need to add salt to raise koi fish Do not add salt to raise koi fish. Koi is a freshwater fish, not a saltwater fish, so there is no need to add salt during feeding. Usually, freshwater fish will only consider adding salt when they are sick. The purpose of adding salt is not to sterilize, but to improve the osmotic pressure of water body, so as to prevent bacteria from infiltrating into fish with water, which is helpful for its recovery. If the fish are healthy, it will change the water environment and make the fish feel uncomfortable.
2. What's the use of adding salt when raising fish1. Blocking germs: Usually, after the fish gets sick, a proper amount of salt will be added to the fish tank with a concentration of about 0.3-0.5%. The purpose of doing this is to increase the osmotic pressure of the water body, because water will naturally penetrate from low osmotic pressure to high osmotic pressure, and germs will also enter the fish with water. After changing the osmotic pressure, it can play a role in blocking germs.
2, Reduce kidney burden: As mentioned above, adding salt can increase osmotic pressure and reduce water entry. Freshwater fish need to rely on kidneys to drain water to maintain the balance of water in the body because of the osmosis of water. After adding salt, less water enters, and the burden on kidneys is naturally small.
3. Raising marine fish: If you raise marine fish instead of freshwater fish, you need to add salt to the water. Because marine fish grow in seawater, and the salinity of seawater is relatively high, after entering fresh water, some marine fish will feel uncomfortable and even die immediately, so salt is needed.
