It may be lack of oxygen, and the little fish is hard to hit by itself. It may also be a disease such as rotten gills, parasites, mechanical damage, etc; innutrition. In any case, it is better to take out the small fish and soak it in light salt water. If the fish has a side, it is better to catch it quickly and put it on the prepared towel. Wipe iodine on the rotten place. It is better to have someone to cooperate. It is difficult for one person to deal with it. At the same time, change water and sprinkle quicklime to catch fish. Adopt disinfection, improve PH, kill parasites, increase nutrient elements and other methods
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