Don't pour the goldfish you just bought into the fish tank with the water. Because the water temperature in the plastic bag is different from that in the aquarium at home, it often makes the fish "catch a cold" and get sick. Sometimes the fish and water you buy carry germs, and once you pour them into the fish tank, it will bring trouble to other fish. Therefore, the fish you just bought should be put in the empty tank water with the plastic bag for 20 minutes. When the water temperature inside and outside the bag is consistent, gently pour the fish into the empty basin, add a little isothermal fresh water appropriately, let it stand for half an hour, and then fish it out and feed it in an empty fish tank filled with fresh water. A week later, when the fish were not found to be sick and resumed normal activities, the fish were fished out and put into the feeding pond for combined feeding.

2. Pay attention to the disinfection of fish tanks

Fish tanks can be disinfected with potassium permanganate solution and soaked in lavender potassium permanganate solution for a period of time. After disinfection, rinse with clean water twice. If it is a glass fish tank bonded with adhesive, it is best to leave it for a while before use, because chemical adhesive is harmful to goldfish.

3. Pay attention to the light.

Goldfish should live in an alternate environment of light and shade. Light can not only increase oxygen, but also stimulate the pigment cells on the surface of fish, which is beneficial to accelerate discoloration and luster.

4. Pay attention to feeding methods

Goldfish is an ornamental fish. The purpose of raising fish is not to make it grow up quickly, so it is necessary to control the amount of food, especially after it is newly bought. Too much food often kills goldfish. The newly bought goldfish can't adapt to the changes of the new environment for a while, so don't give food for the first 1 ~ 2 days, and only give a small amount of food on the third day. The food intake can only be gradually increased, and the food intake should not exceed 1% of the fish's weight. You can feed it once every two days according to this ratio in the future. Don't feed too much and don't be too diligent. Excessive feeding leads to the following disadvantages: First, the fish is full, the metabolic level is improved, and the oxygen consumption is increased, which is easy to cause hypoxia and suffocation; Second, the bait is left, which is easy to rot and ferment, making the water quality worse and causing hypoxia. In fact, goldfish are hungry, and there will be no problem if they are not fed for a week or two.

5. Pay attention to the amount and method of changing water;

Goldfish is a cold-blooded animal, which can survive normally at 0 ~ 39℃, and the optimum temperature is 20 ~ 28℃. When changing water, the temperature difference should not exceed 2℃. If the temperature difference exceeds 7℃, it is easy to get sick or even die. In addition, goldfish, especially young fish, are delicate and should not be completely changed. ① partially change water once every two days in summer/kloc-0 ~ ~, completely change water once every five days in summer/kloc-0 ~/kloc-0, and generally do not change water in winter. (2) The amount of water exchanged should be less than or greater than (the amount of water exchanged is 1/4 ~ 1/3 of the total amount). When changing water, fresh (excellent) water must be used, and the temperature difference between water should not be too large. If tap water is used, it must be cooled for 1 ~ 2 days before use, or 2 ~ 3 grams of baking soda should be added to each cubic meter of water to neutralize chloride ions in the water. If well water is used, it is better to raise goldfish with shallow well water, but it must be used again 1 ~ 2 days before use. If you use rivers, lakes and seas, it must be pollution-free and can be directly used to raise goldfish, but humus and parasites in the water are easy to harm goldfish, so it is safer to use after filtering.

Water change method: it should be carried out at four or five o'clock in the evening. Gently suck away the excrement, residual feed and some old water at the bottom of the pool with latex straws, and add isothermal new water. When injecting new water, slowly inject it along the wall of the pond according to the quantity. Don't pour, don't rush, and don't rush to the fish. Otherwise, it is easy to cause goldfish to catch cold and internal injuries, causing diseases such as scale rot and capillary congestion. After fish adapt to the environment, they will be transferred to normal feeding management.