After the Qingming Festival, the temperature gradually rises, and the fungus insects in the fish pond have become the health hazards of the carp in the pondThe premise is that the heating equipment is not used to survive the winter normally18.
Odawara said,When the water temperature reaches 18, it is necessary to sterilize the fish once
Insecticidal Ma Sutian (0.5 g tons of water) and malachite green (025 g tonnes of water) was put into the water at the same time, and 7 days later it was sterilized with potassium permanganate (2 g tonnes of water). When the water color has faded, you can feed a little bit of feed. 
Attention!The feed at this temperature must be controlled at 0 percent of the fish's body weightWithin 5%. The daily feeding amount is 05%, which is a safety factor value, as long as it is not exceeded, it is basically safe. After that, the amount of food can be increased little by little.
21.
Then, the water temperature continues to rise to 21, and it is another important point in timeThe fungus starts to break out again in this water temperature。Stop eating for two days and repeat the previous operation. With Ma Sutian (05 g tons of water) and malachite green (025 g tonnes of water) at the same time into the water to kill insects, 7 days later with potassium permanganate (2 g tonnes of water) sterilization. 
Do insecticide and sterilization again, one is to consolidate, and the other is to kill the fungus that breaks out in this water temperature again. After that, you can start feeding. The feed this time is generally less than 1% of the weight of the fish. Here is to emphasizeThe amount of feed at this temperature must not exceed 1%.。When you feed more than that, the gills of the fish are prone to problems.
But at this temperature, the fish really want to eat. At this time, the difference between the master and the novice can be reflected, and the master can often resist the urge to feed well, and in the eyes of the koi fish with longing and expectation, they turn around and leave. 
If you hold back and wait until 23 to feed the fish, the fish will grow very well. But at this time, it is overfed, and when there is a problem with the gills and internal organs, when the real water temperature comes up, the fish will not be able to eat. 23
Then, when the water temperature reaches 23, this is the most suitable temperature for the fish to grow. At this temperature, you only need to kill it again with potassium permanganate, because all the insects have already been killed. 
Then you can start feeding normally, at this time, the amount of feeding is about 2% of the body weight of the fish. However, this feeding amount is also based on the size of the fish, two or three-year-old fish may eat a lot of feed, but some ** ten cm fish, can not eat so much. So, to put it simply, as long as your fish is willing to eat it, there is probably nothing wrong with this temperature.