1. Why should freshwater fish be salted In normal feeding process, freshwater fish generally do not need to be salted, but if fish are sick, they need to be salted. The purpose of adding salt is not for disinfection, because the concentration of salt is usually not high, which can not achieve disinfection effect, but it can change the osmotic pressure of water body. Usually, water will penetrate from places with low osmotic pressure to places with high osmotic pressure. After increasing the osmotic pressure of water body, less water will enter the fish body, thus preventing bacterial invasion.
2. What is the concentration of salt for freshwater fish1, 0.5%: Five thousandths of salt is generally the normal concentration of salt, under which fish will not feel uncomfortable, and it can also play a certain role in helping. This concentration is the old three commonly used in the treatment of fish diseases. But this concentration can't cure diseases, because it can't kill bacteria.
2, 0.6-0.8%: This concentration is slightly higher, but it basically has no bactericidal effect, but it can still cure diseases with drugs. For some larger fish, this concentration of salinity is more suitable, which is much better than the treatment effect of 5% per thousand.
3, 1.5-2%: When the concentration reaches 1.5%, the sterilization effect has already been achieved, and the fish cannot live in this environment for too long, otherwise the water in the body will gradually seep out, causing it to dehydrate and die. Usually, only when the illness is serious, it is necessary to use this high-concentration saline, and the soaking time should not exceed 30 minutes.
