How often do you change the water for domestic fish farming? What are the points for attention in changing water?

Now there are many people who raise fish at home. On the one hand, they can relieve pressure, on the other hand, they have the meaning of attracting money. So how many days does the fish raised at home usually change the water? What are the points for attention in changing water? Let's take a look at it.

How often do you change the water for domestic fish farming?

Generally speaking, when the weather is colder in winter, the water in the tank will not be changed so quickly, so it does not need to be changed as quickly as in summer. When we find that the fish begin to float to the surface to drink water, it shows that who in the fish tank has been deprived of oxygen, this is that we need to change the water. And we can also raise some useful aquatic plants in the fish tank, which can supply oxygen through photosynthesis. In addition, in the replacement of new water, we should also pay attention to the temperature difference of the water, the temperature difference can not be too large, otherwise the fish will not adapt and get sick.

Second, what kind of water should be changed?

1. Raw water: raw water refers to tap water or well water that has just been released and has not been dried. Its water temperature is often quite different from that in fish ponds, and it contains more chlorine. This kind of water is very harmful to fish.

2. Fresh water: fresh water is tap water or well water or spring water, which is dried and settled for about 2-3 days, and the water temperature is equal to or similar to that of the fish pond.

3. Chen Shui: Chen Shui is the dirty water containing feces and dirt at the bottom of the fish pond, including the feed water that has not been changed for a long time in the pond.

4. Green water: there are more green algae floating in the old water, and they are also a good auxiliary feed for fish. this kind of water has less decomposed organic matter and more dissolved oxygen, and the fish are often raised in tender green and clean old water. The fish has the most exuberant appetite, strong body, bright color and rapid development.

5. Clear water: if it is found that the old green water in the original pond suddenly becomes clear water, many green algae precipitate the bottom of the cylinder, this phenomenon is called clean water, this kind of water is easy to cause fish disease and needs to be completely replaced.

Third, common methods of changing water

1. General change of water: under normal circumstances, especially in the hot summer, as long as you stick to the faeces and dirt at the bottom of the fish pond (tank) together with the old water every day, gently suck out 1 inch 10 times 1 stroke 5 with a hose to remove the dust and feces from the water surface, and then slowly inject isothermal new water along the wall of the pond (tank) to keep the water quality clean. This water exchange method is not easy to damage the fish body, the method is simple and safe, and is most suitable for fish farmers in family fish tanks or small ponds.

2. Partial water change: partial water change is mainly carried out in two cases.

① in the hot summer and early autumn, the feed water in the fish pond (tank) has been changed for only a few days, and the water color turns green very quickly (because of the small amount of feed). When the water quality is still clean, in order to prevent the fish from burning their tails, you can fish out all the fish in the pond (tank), and then rotate the water in the pond (tank) in a spiral, waiting to rest for a while. Suck off the dirt and old water from the center of the pond (tank) with a rubber tube, then inject isothermal, equal amount of new water, and then fish the fish into the original pond (tank) to raise.

The water in the ② pool (tank) has only been changed for a few days, and the color of the water is still good, but due to excessive feeding on that day and floating head, emergency measures must be taken. The method of changing water is the same as that mentioned above. If it is a large fish pond in the fish farm, it is not necessary to fish out the goldfish, but use a folding net to block the fish to one side, and then gently rotate the water in the pond with a fishing net for dozens of seconds. wait for the water to rest for a moment, then open the drainage gate to slowly release water, or use a straw to remove excess fish and insects, feces and old water in the middle of the pond (tank), or after using a fish net bag to remove the excess fish and insects from the center, then remove the old water of 1gamma, 41zu2. Finally, the same amount of isothermal new water is injected, which is common in the first aid method used in fish farms or families due to excessive food intake.

3, thorough change of water: complete change of water is often combined with turning the pool (tank) to select young or adult fish at the same time. It is often used when the water quality is seriously deteriorated or the moss is too long and the fish is too dense.

In the case of no free pool, ① has to fish all the fish into the basin or put the cage into the water of the adjacent pond for temporary cultivation, and add an oxygen-increasing head to increase oxygen in the basin or cage. Then, brush off the moss on the wall of the original pool, rinse thoroughly, re-inject isothermal new water, rest for a while until the water temperature is equal, and fish into the original pond (tank).

② if there are free ponds and fresh water, as long as all the fish are fished into pots or cages and selected and treated separately, the fish can be reared in the new water regardless of the water temperature of the sub-ponds. This method of changing water should pay special attention to the water temperature, and it is best to choose a sunny day before 9: 00 in the morning. However, this method is generally only applicable to adult fish or older young fish, and larvae are not suitable for use. If conditions permit, before thoroughly changing the water, fill the spare pool (tank) with volt water, and then fish the fish directly into the spare pool (tank). In this way, the change of water temperature is small, and the school of fish can easily adapt to the new environment, so that the fish can avoid the pain of squeezing and rolling in the basin or cage. This method of changing water is generally carried out every half a month or so in spring and autumn. Summer volt weather, water temperature as high as 28 ℃, in the water color is very easy to thick color, the water quality is easy to turbidity, generally 5 Mel 7 days should be thoroughly changed water. When the water temperature drops to about 4 ℃ in winter, the activity of the fish is slow, the appetite is reduced, and the water quality is not easy to deteriorate.