Fish friends know that salt is a medicine for fish, which can treat fish diseases and parasites. But few people know the theory of adding salt and how to improve the disease resistance of fish. Under what circumstances should salt be added? How much should be added? If excessive, it will harm the fish. The following article analysis, aquarists follow the pet editor to learn together.

1. Knowledge of the classification of salt added to ornamental fish

a. Ordinary edible salt:

Reprocessed salt, vacuum-processed salt, powder washed salt, refined sea salt, Japanese salt Sun fine salt. These salts are generally not sold directly on the market and can only be used as mother salt for iodized salt.

b. Medical and medicinal salts:

Low sodium salts: The function is to prevent vascular diseases. Iodized salt: The function is to prevent iodine deficiency diseases. Add selenium salt: the function is to prevent Keshan disease, Kashin-Beck disease and so on. Sea group salt: the function is to prevent filariasis. Zinc salt: The function is to promote growth and improve intelligence. Fluoride anti-caries salt: The function is to prevent dental caries. Mebendazole salt: The function is to prevent human parasites such as worms, roundworms, whipworms, etc.

2. The effect and purpose of adding salt to water

a. Adjusting the osmotic pressure of water:

The purpose of adding salt is to adjust the osmotic pressure of water and reduce the The penetration of fish body can reduce the burden on gills and kidneys, reduce the pressure on the osmotic regulation system, and improve the disease resistance of fish.

b. Block bacterial reproduction:

Adding salt can reduce the negative consequences of heating. To prevent bacteria from entering the body of the fish to the greatest extent, so warming up and adding salt are complementary to each other.

c. Inhibit bacterial penetration:

It is due to the difference in osmotic pressure inside and outside biological cells after salting, and water molecules move from low salinity to high salinity, resulting in cell dehydration , to kill some creatures. The mechanism of salt sterilization is also that by changing the specific gravity of water, the reverse osmosis of the bacterial cell membrane is caused to kill the bacteria.

d. Unfavorable wound healing:

Just salt water is not good for freshwater fish wound healing, because it will also kill new cells. But it is usually not recommended to add salt, otherwise harmful bacteria will adapt to the higher salinity, and then adding salt will have no effect.

3. Methods and precautions for adding salt in water

a. For fish disease treatment:

It is correct to add salt only when the fish is sick and needs to be treated time. Adding salt every time you change the water will reduce the osmotic adjustment ability of the fish, and the effect will be poor when the fish is really sick.

b. Pay attention to water quality problems:

Improper addition of salt will aggravate the disease. If the water quality is not controlled and salt is added, the water quality will be damaged once again, and the fish will be attacked again.

c. Do not use seasoning salt:

It is best to use coarse salt or special aquarium salt for salt, not seasoning salt with additives, such as iodized salt. The salt should be dissolved and filtered before adding, and the salt concentration should be gradually increased within 1-2 days to avoid the osmotic shock of the fish.

d. Safe concentration of salt:

The concentration of salt must reach 0.3%-0.5% to adjust the osmotic pressure. This concentration is very important for most fish. safe. Some fish, such as some soft-water fish and some catfish, are very sensitive to sodium chloride, so use salt with caution.

e. Too light will not work:

Many people do not dare to add more salt when treating fish diseases, but just sprinkle a few more salts than usual. It can only slow down the reproduction of bacteria, not kill it. A few handfuls of salt won't do any bactericidal action at all.

f. Excessive use of salt is harmful:

Excessive use of salt will cause excessive osmotic pressure, which will lead to physiological changes in body cells, which will lead to a decline in fish resistance to disease. When the salt concentration exceeds 1%, even short-term immersion can cause adverse reactions in fish.