CATDOLL : CATDOLL: How to treat crucian carp in the fish pond with Saprolegniasis

1. How to treat crucian carp in the fish pond with Saprolegniasis

Mold disease is commonly known as white hair disease and skin mold disease. When Saprolegnia first parasitizes, there are generally no abnormal symptoms in the diseased fish. When symptoms are seen, the mycelium has already invaded the wound of the fish and grown outward. Sometimes, the primary lesion is ulcerated due to infection by pathogens such as parasites and bacteria, and the zoospores of the mold invade the ulcerated part of the fish, absorb nutrients in the skin, and rapidly multiply, spread, and expand in the injured lesion, gradually growing cotton-like mycelium. The mycelium entangles and adheres to the cell tissue of the wound, causing skin ulceration and tissue necrosis. At the same time, as the area of ​​the lesion expands, the fish is overburdened, swimming is abnormal, appetite is lost, and the fish becomes emaciated. Eventually, the diseased fish dies from physical exhaustion.

This disease generally occurs in low water temperature environments below 20℃ and is most likely to spread in early spring and late winter. Saprolegniasis has no strict selectivity for hosts, and all kinds of farmed fish, from fish eggs to adult fish, are easily infected. Fish in densely-stocked wintering ponds, fish in thin water bodies in spring, or fish in a hungry state are most susceptible to Saprolegniasis. When stocking fish in spring, improper operation can also cause an outbreak of Saprolegniasis.

Prevention and control methods: Be as careful as possible when putting fish into the pond to avoid injuring the fish. Soak the fish in a 3% to 5% salt solution for 8 to 10 minutes before entering the pond. Avoid handling farmed fish at water temperatures below 15°C to prevent frostbite or abrasions on the fish. If the fish are found to be infected with Saprolegniasis, sprinkle a mixture of baking soda and dibromohydantoin throughout the pond, but pay attention to the physical condition of the sick fish and changes in water quality to prevent production accidents.

2. What to do if crucian carp gets Saprolegniasis

Just soak it in salt water and it will be fine.

3. How to prevent diseases of crucian carp?

Crucian carp can live in very dirty water and has low requirements for water quality, so it rarely gets sick. It is usually injured by the rot in dirty water. It will start to rot if it is left alone for a long time, and it will die if it rots severely. I have never heard of it getting sick.

4. There are some small red spots on the scales of the crucian carp in my fish pond. What causes it? What kind of disease is it? What should I pay attention to? How to solve it? Please answer the expert

Bacterial hemorrhagic septicemia: This disease is also called an fulminant infectious disease. Main symptoms: The head and body surface of the diseased fish are congested or bleeding, and the muscles also have bleeding. It mainly harms many freshwater fish species such as silver carp, bighead carp, crucian carp, and bighead bream. The onset time is the entire production season, and the incidence rate is higher in the high temperature season. It is the most serious epidemic that has harmed my country's freshwater fish in recent years. Prevention methods: 1. Remove silt and disinfect the pond with quicklime; 2. Strictly disinfect the pond before the fish are put into the pond to kill external parasites in time; 3. Regularly add new water and disinfect with quicklime water every 10-15 days; 4. The tools used by the diseased fish must be strictly disinfected, and the dead fish must be buried deeply. This disease is a systemic disease, and the treatment requires both oral and external medications. External use of chlorine dioxide, internal use of blood god