The first thing of the old three is to change the water. Water exchange is not strange for fish farming, but the general water exchange cycle is about a week, and the old three kinds of water exchange is every other day, so as to improve water quality as soon as possible. By changing water, the content of harmful bacteria in the water body can be reduced, so as to provide a healthier environment for the fish, which can also provide some help for its rehabilitation, and the new water can also play a stimulating role.
The second sample of the old three samples is temperature rise. Compared with the original water temperature, it can rise 1-2 degrees Celsius, if the water temperature is relatively low, it can also continue to heat up, but this process must be slow, too fast warming is also harmful to their health. The purpose of warming is to stimulate the resistance of fish, accelerate metabolism, eliminate harmful substances, and provide a basis for their recovery. However, heating up has its drawbacks, harmful bacteria in the water will multiply with the increase of temperature, so we need a third kind.
The third sample of the old three is salt. Do not salt too much, generally maintain the salinity between the first three thousandths and five thousandths, because freshwater fish can not adapt to the environment with too high salinity. Although this concentration of salt has no bactericidal effect, it can increase the osmotic pressure of the water body, thus reducing the water entering the fish body, and also preventing the invasion of harmful bacteria.
