Control of common diseases of Pseudosciaena Crocea

1. Stimulation of cryptonuclear disease (white spot disease)

There are a large number of small white spots on the body surface of the symptoms, and in serious cases, the fish body is covered with a layer of white film, which will cause secondary bacterial infection due to the destruction of the worm body, resulting in inflammation and necrosis of the fish body epidermis, easy shedding of scales, decay of the fin, splitting, parasitic Gill, destruction of the Gill piece, infection with bacteria, will cause rotten Gill phenomenon. When the worm invades the cornea of the fish, it will cause inflammation, blindness, loss of appetite, thin body and swimming disorder. The worm body can be observed and judged by microscope.

Control methods: (1) the culture density should not be too dense; (2) soak the diseased fish in malachite green solution of 0.4 × 10E-6~1 × 10E-6 concentration for 5 minutes, and then bathe once every other day; (3) soak the diseased fish in formalin solution of 60 × 10E-6 concentration for 15 minutes, and sprinkle the soil pond with 20 × 10E-6~30 × 10E-6 concentration; (4) mix the fresh water with 50 × 10E-6 concentration and soak for 5 minutes.

II. Brookiasis

The symptoms are mainly parasitic on the gills of fish fry. During a large number of parasites, the gills are grayish white, there are many dirt on the body surface, irregular white spots are formed on the body surface, the pectoral fins extend vertically from the side of the body, and the diseased fish often float on the surface of the water and swim slowly. It can be judged by microscope.

Prevention and treatment methods (1) soak in furazolidone solution of 20 × 10E-6 concentration in fresh water for 2 minutes for 5 minutes. (2) soak the formalin solution with 200 × 10E-6 concentration of seawater for 20 minutes under the condition of increasing oxygen; when the running water is slow, when the net is lifted to a depth of 0.5m, dilute formalin 50 times with sea water and sprinkle it directly into the cage for 20 minutes before and after operation. (3) soak in 2 × 10E-6 cupric sulfate solution of seawater for 10 minutes for 20 minutes (seedlings should be used carefully).

3. Rotifer disease

Symptoms of a small amount of parasitism, there are no obvious symptoms, serious infection, can cause parasitic mucus increase, fish swim slowly, dyspnea and death, generally no special symptoms.

Methods: (1) washing for 30 minutes with copper sulfate, (2) sprinkling the mixture of copper sulfate and ferrous sulfate in the whole pool at the concentration of 0.7 × 10E-6 (5 ∶ 2) for 2 days, and (3) washing with formalin solution at the concentration of 200 × 10E-6~250 × 10E-6 for 5 minutes.