In the past, many aquarists may be the understanding of salt, most are bactericidal, insecticidal effect. This is used to change the osmotic pressure as the mechanism to achieve. But the salt on the osmotic pressure of tropical fish, the body itself has some regulatory role, we are in the breeding process should always take into account the role of osmotic pressure.

Osmotic pressure of the definition: a solution will be placed in the U-tube and water in the middle of the U-tube placed in a semi-permeable membrane to separate water and the solution, you can see the water through semi-permeable membrane to the solution of one end of the run, assuming that the solution side pressure, and this pressure can be just to prevent the infiltration of water, this pressure is called osmotic pressure.

First, in terms of sterilization, to talk about one of the chemical mechanism. Bacteria, fungi and parasites and other microorganisms, are formed by the cells, the osmotic pressure in the definition of semi-permeable membrane, can be seen as bacteria, fungi and parasites and other microbial cell membrane. Intracellular osmotic pressure difference, we put salt, leading to bacteria, fungi and parasites like the body’s osmotic pressure is less than the osmotic pressure of the outside world, these microbes will dehydrate, so that it died, played fumigation the effect.

But usually not recommended, because of harmful micro-organisms adapted to high salt concentration, and other fish, then no effect on the sick. In addition, wound healing time try not to salt, because the fish of the new cells will be affected by the salt.

Secondly, from the fish’s physiology is concerned, we can take as an example of marine fish, clown fish into fresh water if it is very difficult survival. Including sea anemones, starfish, coral, etc., because they all have their own osmotic pressure, and higher than the osmotic pressure of freshwater fish and more, we will put it in fresh water, equivalent to reducing the external osmotic pressure, such as infiltration pressure mechanism will lead to swelling of fish cells, and then rupture, leading to fish kills; Similarly, although freshwater fish living in fresh water, salt water is also a certain, and we also have added some new water the osmotic pressure we go, especially hi the old water fish, when changing the water in a large number do not forget to add a certain amount of salt to maintain its osmotic balance.

Many aquarists have experience in this area, adding salt water fish, the state better than some, bright colors, lively love animals, rays stretch. We not only want to use the principle of osmotic pressure sterilization saline treatment, but also to use its principles to our fish live better.