The third sample is mainly aimed at the common diseases of arowana. The old three samples include: heating, changing water and adding salt. This is a method to adjust the water quality, and it is also a fundamental method to prevent and treat fish diseases, and it is also the safest method to treat many common diseases of arowana. However, compared with drugs, the role of the old three is slow. Therefore, many fish friends gave up the third species in order to cure fish diseases faster.

Let's talk about Lao San in detail.

1. Changing water: Changing water for arowana is a quick way to change water quality. By changing the water, the toxic substances in the tank can be diluted and its concentration can be reduced. However, it should be noted that the new water used for changing water should not contain chlorine.

2, heating: some bacteria and parasites in the tank are not very heat-resistant, the temperature will be killed, and heating can also improve the metabolism of fish. Be careful not to suddenly rise too much when heating up, and the temperature should be within the range that the fish can only bear.

3. Adding salt: The purpose of adding salt is to adjust the osmotic pressure of water, reduce the water penetration to fish, reduce the burden on gills and kidneys, reduce the pressure of osmotic adjustment system, and improve the disease resistance of fish.

Adding salt can reduce the negative consequences of temperature rise. Although the increase of temperature can accelerate the reproduction of bacteria, the osmotic pressure of water decreases after adding salt, which can prevent bacteria from entering the fish to the maximum extent. Therefore, temperature rise and salt drop are complementary.