How to prevent and treat common diseases of broodstock? Explained clearly in one article

1. Vibriosis

The pathogen is Vibrio alginolyticus. When fish are affected, they move sluggishly, frequently swim to the surface, and reduce or stop feeding; the ends of the caudal, pelvic and dorsal fins become congested and inflamed, the tissue between the fin rays gradually breaks apart, and in severe cases the fin rays rot; the eyes bulge outward, and the body surface of diseased fish shows ulcerative lesions in variable locations, which in severe cases rot into a deep hole with exposed bone; Vibrio can be isolated from the blood and internal organs, and the mortality rate is relatively high.

Prevention and treatment methods: 1) Immunize the fish with a vaccine. 2) Medicated immersion, usually soaking for 30 minutes in a 100 ppm furazolidone solution. 3) For wounds, apply sulfa-6-methoxypyrimidine by smearing. 4) Feed 5-10 g of sulfa-6-methoxypyrimidine per 100 kg of fish per day mixed into the feed, continuously for 4-6 days (double the dose on the first day). 5) For injured fish, antibiotics can be injected, gentamicin 200,000 iu/kg.

2. Microsporidia

They mostly parasitize the adipose tissue and gonads of broodstock, forming cysts that are black on the outside and block-shaped, with a diameter of up to 2 cm; the cysts are filled with spores and can cause infertility or even death of the broodstock.

Prevention and treatment methods: 1) Do not use live fish parasitized by microsporidia as feed. 2) Tools used in affected fish ponds must be soaked and disinfected in a 1% formalin solution. 3) Remove diseased fish promptly. 4) Mix 0.8-1 g of sulfa-6-methoxypyrimidine or sulfadimethoxypyrimidine per kg of feed and feed continuously for 4 days, stop for 3 days, then feed continuously for another 4 days. 5) Use 12.5-50 mg of fumagillin per kg of fish per day, mixed into the feed and fed continuously for 3-10 days.

3. Benedeniasis

It is mainly caused by Neobenedenia-like worms, which parasitize the skin of grouper, especially the front half of the back; when numerous, hundreds can parasitize a single fish. These worms can crawl on the fish body. When there are many parasites, the fish are restless in the water, rub against nets or pond walls, injure the body surface, develop bacterial infection and inflammation, and secrete large amounts of mucus; in severe cases there is anemia, emaciation, body surface ulceration, and finally death.

Prevention and treatment methods: 1) Soaking in fresh water for 3-5 minutes causes the worms to fall off and die. Eggs must be soaked in fresh water for 40 minutes to be killed, so the fresh water used for soaking must not be poured into @#@233@#@ water bodies. During soaking, add drugs such as furans or antibiotics to the fresh water to prevent the fish from being injured during soaking and then infected by bacteria. 2) Bathe for 4 minutes in a 0.05% formalin seawater solution, or bathe for 10 minutes in a 0.025% formalin seawater solution.