Prevention of fulminant hemorrhagic disease of fish
Main measures to prevent fulminant hemorrhagic disease of fish:
1. Enhance the awareness of prevention. The disease has the advantages of acute onset, rapid infection, long epidemic season, high mortality and great loss. Once the disease is difficult to control, the disease is easy to repeat.
two。 The seedlings must be sterilized with 1%-2% salt water before entering the pond, and the bathing time depends on the physique and temperature of the fish. When conditions permit, the fish can be soaked with fulminant hemorrhagic disease vaccine.
3. Change water and increase oxygen at the right time. Keep the water quality fresh and change the water frequently. If the condition is limited, it is inconvenient to change water, the whole pool can be sprinkled with raw lime slurry, and the aerator should be used reasonably at the same time.
4. Regular water disinfection and oral drug prophylaxis. Environmental protection drugs such as dibromohydantoin and bromochlorin can be used to disinfect the water alternately every 10 to 15 days, and beneficial microbial preparations can be used to improve the water quality every 5 days after disinfection. In the feed mixed with appropriate amount of berberine hydrochloride, aquatic special erythromycin and other safety drugs, 5 days as a course of treatment, 1 ~ 2 courses of treatment per month.
5. Reasonable close culture and mixed culture. Try not to let the water environment carry an overloaded fish stock.
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What is salmon?
What is salmon? To answer this question, we must first understand the origin of the name salmon. According to textual research, Chinese salmon was first proposed by Hong Kong and Taiwan, which is the transliteration of the English name salmon, because the English pronunciation of salmon is similar to that of salmon, and the standard Chinese translation of salmon should be salmon or salmon. Salmon is not a taxonomic name for fish, but a trade name for certain salmonids or trout. To be a salmon, his muscles must be firm and elastic.
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Discrimination of female and male in brocade carp
After brocade carp grows to adult fish, there is a difference between male and female, and we can distinguish them from head, body shape, abdomen, pectoral fin, anus, spawning movements and so on. 1. The head of the female fish is slightly narrower and longer; the head of the male fish is wide and short, and the forehead is slightly raised. two。 The body of the female fish is short, thick and plump, and the abdomen is enlarged, the closer it is to labor, the more obvious the abdominal swelling is; the male fish is longer and thinner. 3. The tip of the pectoral fin of the female is round and larger; the male.
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