Analysis:

(1) Symptoms: The fin edge of the diseased fish appears milky white and then decays, resulting in fin insufficiency, especially the caudal fin. Sometimes the connective tissue between the cartilage of each fin is cracked, sometimes the caudal fin is broom-shaped, and in severe cases, the whole caudal fin rots. The scales of diseased fish are normal, or some scales fall off. Some sick fish have bloodshot tail fins.

(2) Pathogen: It may be bacteria, and its name is to be determined.

(3) Harm and epidemic situation: the disease will occur from the fish of the year to the spawning parent fish, and the big fish is common. It occurs all year round, and often causes the death of sick fish in summer. When the water temperature is low, the whole tail fin rots, and the sick fish is still alive, making goldfish. The ornamental value of koi fish is reduced, and keeping goldfish at home is easy to cause this disease. This disease occurs all over China.

(4) Prevention and control methods:

1. Apply malachite green 1% water solution to the broken fin. Once a day for 35 days. In order to prevent water mold infection and promote wound healing. reuse

Spray furacilin or furazolidone 1ppm-2ppm on the whole pool.

2. Apply with 1% furazolidone or rivanol aqueous solution once a day for 3-5 days. Then spray the whole pool with the above concentration of furacilin or furazolidone.

3. Sprinkle rivanol all over the pool. Suitable for rare species, and the concentration is the same as that for preventing gill rot.

4. At the same time of drug treatment, animal feed such as Daphnia, Cyclops and Earthworms must be fed to strengthen nutrition, so as to enhance the ability of disease resistance and tissue regeneration.

Force.

5. If a part of the caudal fin is incomplete, it should be cut off with scissors to flatten the fin, and then treated with the above drugs. Usually, after 10- 15 days, the split fin can heal and the cut fin can regenerate. Usually after 4080 days, the entire caudal fin can grow again. There are traces between the regenerated fin and the original old fin. The ornamental value of this fish is reduced, but it can be used as a parent fish to breed offspring.

Apply iodine directly to the affected area ~, after 3-5 seconds of stagnation, put it in 0.3% physiological saline, and you will find that the tail turns clean yellow-white ~ ~ and changes color, ~ ~ haha ~ ~ but the floc that has been removed will disappear in a blink of an eye ~~HOHO~~ Where is the third effect? This is obviously the first eradication.