1. Mild rotten tails: First, change the water for the fish, which is 1/4 of the water in the whole fish tank, and change the water once every 2-3 days. After changing the water, add 3 ‰ salt or Japanese yellow powder to the water quality, plus 1 ‰ baking soda water, so that the concentration of water tends to be alkaline, which can improve the pH value of the water quality. Add a lot of oxygen in the bathtub, so that the water in the fish tank circulates, and the oxygen in the fish tank is sufficient, which can reduce the reproduction of germs. At the initial stage of the onset of unfinished tail of anchovies, feeding should be stopped, and a small amount of feeding should be carried out after 4-5 days, and normal feeding should be resumed after the unfinished tail grows well.

2. Severe unfinished tail: Severe unfinished tail should be treated with drugs, and furacilin powder can be put into water for cleaning and disinfection. 3-5 tablets of furazolidone can also be put into the water, and the fish with severe unfinished tail can be washed for 30 minutes. Putting 5-8 tablets of oxytetracycline into water can prevent the infection of such diseases.

1, provide good water quality environment for anchovies, keep their environment clean and change water frequently.

2, the water temperature should be controlled at 20 ℃, and about 24 ℃ is more suitable. Protein-rich insects should be fed.

3. Sprinkle quicklime regularly in the fish tank to ensure that the water is always in alkaline state, which can effectively prevent the occurrence of unfinished tail.

4. Pay attention not to hurt the tail when changing water and fishing for fish. If there is a slight scar, it should be isolated in time, and then put together for culture after the wound heals, which has a good preventive effect on unfinished tail.