Fish body ulcers, thin and weak fish: how to prevent and control fish lice disease in winter?

    Fish lice disease is an invasive fish disease caused by fish lice attached to the fish body surface. Fish lice disease is very prone to outbreaks in low-temperature seasons, causing fish to become thin and weak. Fish lice can crawl freely on the fish body surface, forming many wounds, causing ulcers on the fish body and secondary bacterial diseases.

Fish farming

    Pathogen: fish lice, shaped like bedbugs, transparent throughout, bluish-white in color, parasitic on all parts of the fish body, with more parasitism under the belly, on the fins and on the tail. When fish lice parasitize, they pierce the fish body surface tissue with their mouth spines and suck blood and body fluids. When fish lice parasitize on a fish, they change with the fish's body color, making them difficult to find.

    Symptoms: flat round worm bodies can be seen with the naked eye crawling or biting on the fish body; the fish is extremely restless, jumps out of the water, swims frantically, etc. Some diseased fish rub against the pond walls, roll over, etc. Severely diseased fish gradually become emaciated and die.

    Prevention and control: (1) Disinfect the fish pond with quicklime or tea seed cake to kill adult fish lice, larvae and egg masses.

   (2) When a small number of fish lice are found on an individual fish, they can be removed with tweezers, and the bleeding areas on the fish body should be disinfected with gentian violet.

   (3) When stocking fish fingerlings, soak them in a 3% sodium chloride (table salt) solution for disinfection for 5 minutes (at 20°C).

   (4) In ponds where fish lice occur in large numbers, remove all diseased fish, put them into a 0.1-0.15% crystalline trichlorfon solution and soak them for 2-5 minutes, then place the fish into a pond that has already been disinfected and refilled with water, and they will soon return to normal.

   (5) Prevention and control with Chinese herbal medicine: take 15 kg of camphor tree leaves per mu of water surface, mash them, and splash the whole pond with both residue and juice; or use 15 kg of masson pine needles per mu, crush them, soak out the juice, and splash the whole pond, which can make fish lice fall off in about 3 days; you can also use 20 kg of fresh pine branches with needles per mu of fish pond, tie them into large bundles and put them into the fish pond, and in about 5 days the fish http://www.lssp.com/search?q=%E9%B1%BC can fall off.