Prevention and treatment of common bacterial diseases in fish
1. Hemorrhagic disease
The cause of the disease is the deterioration of water quality at the bottom of fish ponds, low dissolved oxygen, many harmful substances, poor culture management, or feeding moldy and inferior bait.
Prevention and control methods to strengthen feeding and management, comprehensive prevention. If drugs are used regularly, dibromohydantoin, bromochlorohydantoin and Chinese herbal extract preparations can be used to disinfect the water; or beneficial bacteria such as photosynthetic bacteria can be used to purify water quality; immune enhancers can be added to the diet to absorb and degrade ammonia, nitrogen, nitrite and other harmful substances in water by using zeolite powder and nitrite degradants. After the onset of the disease, effective drugs were used to kill parasites, and dibromohydantoin and bromochlorohydantoin were used for water disinfection. Feed the bait while sprinkling disinfectant, adding 1.5 grams of bioactive additive per kilogram of feed for 5 days.
two。 Enteritis disease
The causes of the disease are the deterioration of water environment, low dissolved oxygen, feeding metamorphic feed and the decrease of fish resistance. The disease often occurs from April to September.
The method of prevention and control is the combination of external elimination and internal administration. Disinfectants such as bromochlorohydantoin or dibromohydantoin can be used to disinfect aquaculture waters, and immune polysaccharides Haizhenbao or Yubiao can be added to the diet to enhance the immunity of fish to control the disease.
3. Gill rot disease
The cause of the disease is caused by direct contact between fish and pathogens, especially after mechanical damage to the Gill of fish. The disease can occur in the range of 15-30 ℃, and the higher the water temperature is, the easier it is to occur.
The prevention and control methods should avoid fish injury during operation, soak and disinfect the seedlings with potion, and use Yubide or dibromohydantoin to prevent and cure the disease.
4. Red skin disease
The cause of the disease can be caused by fish injuries caused by manual operations such as fishing, transportation, stocking, or mechanical injury, frostbite and parasitism. The disease can be prevalent all the year round.
Before overwintering, disinfectants such as bromochlorohydantoin should be used to disinfect the pond water and deepen the pond water. After the onset of the disease, the combination of pesticides and disinfectants should be used in time to treat the water, and take natural plant extracts and other drugs for treatment.
- Prev
Measures to ensure the supply of fish fry
Functional use in view of the serious damage to farmed fish fry in the disaster area, shortage of supply and other problems, put forward to strengthen the cultivation, collection of parents and other measures to ensure the supply of fry. Technical measures 1. Statistics understand that the number of seedlings and the production capacity of seedlings are needed to restore production in the region, find out the gap of seedlings, contact the seedling production field as soon as possible, and supplement high-quality and healthy seedlings to resume production. two。 Pay attention to understand and grasp the market information of parent fish, and do a good job in collecting parent fish.
- Next
How to identify the quality of fish species
First, to see whether the specifications are uniform of the same kind of fish, those who come out of the pond with uniform specifications are generally more physically fit. Second, to see if the fish is glossy and strong, there is a layer of mucus on the body surface of the fish to protect the scales and skin from germs, so the body surface shows a certain luster. On the other hand, the body surface of sick and injured fish is lack of mucus and no luster, or some diseased fish have too much mucus and lose their luster. Third, the body color of the fish species reflects its advantages and disadvantages through the body color of the fish species. The body surfaces of high-quality fish species are respectively:
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