Thoroughly organized! Teach you to deal better with wheelworm disease!

First, the harm of wheel worms

The wheel worm is a type of ciliate, about 0.07 mm in size, which is invisible to the naked eye. Under the microscope, it looks like a wheel from its back surface, so it is called a wheel worm. When parasitic on a fish body, the rotifer wears down the fish's skin and gill tissue with its characteristic "wheel", the constant rotation of the tooth ring, and then swallows its cell debris or parasitic blood cells.

Therefore, when the wheelworm multiplies in large quantities, the diseased fish is stimulated by the parasite of the insect body, which will cause the tissue to become inflamed and secrete a large amount of mucus. The fish then dies of emaciation, blackening, slow swimming, and difficulty breathing.

Second, the symptoms of wheelworm disease

Sick fish are characterized by black bodies, swimming alone, some swimming wildly around the edge of the pool in groups, and some fish can see the symptoms of white heads and white mouths.

Large yellow croaker: When parasitizing in large quantities, the diseased fish is stimulated by the parasitism of the insect body, causing tissue inflammation, increased secretion of skin and gill mucus, emaciation, blackening, slow swimming, and difficulty breathing.

Toad: The mucous membrane of the tail fin is visible to the naked eye, and in severe cases, the tail fin is corroded. Sick tadpoles float on the surface of the water to breathe, loss of appetite, and slow movement.

Spotted forktail catfish: because the body surface or gill tissue is stimulated by parasites, the host secretes a large amount of mucus, and in severe cases, breathing difficulties may occur, the body color is dark, and the fish body is emaciated.

Loach: Diseased loach initially reduces feeding and swims out of groups; in severe cases, the insect body is dense, the fish do not swim sluggishly, and the gills move slightly. Failure to treat in time can lead to death.

Yellow jaw fish: Sick fish are isolated, head down, tail up upside down on the water surface or lying on their sides under the water, breathlessness difficulty, soon death. Individuals with wheelworms that parasitize the surface of the sick fish are larger, while wheelworms parasitizing gills are generally smaller. When the diseased fish is severely infected, it swims wildly along the edge of the pond, in the shape of a "running horse", and sometimes a layer of white wings appears on the surface of the sick fish.

Tilapia: Diseased fish infected with rotifers, black body color, poor feeding, thin physique, slow swimming. Sometimes the body surface is whitish or bruised, and the mucus on the gills is secreted a lot, and there is a local whitening phenomenon. Gill epithelial tissue hyperplasia, gill filament swelling or damage, etc., a large number of parasites will seriously affect the respiration of gills, so that the fish suffocate to death.

In addition to the several fish introduced above, carp, crucian carp, yellow eel, sturgeon, Wuchang fish and other fish are more or less endangered by wheel worms.

Third, the causes of wheelworm disease and preventive measures

1. The immunity of the fish body is low. When the fish's immunity is low and there are wheelworm parasitism, the wheelworm will multiply in large quantities, causing the disease and causing dead fish. Especially after the overwintering of fish, physical consumption is larger, immunity is low, and it is more susceptible to disease. Therefore, after the fish begin to feed after wintering, it is necessary to pay attention to strengthening the nutrition of the fish and choose a better compound feed to feed, but pay attention to the amount of each feeding not too much. At the same time, a part of the nutrition and immunomodulators can be added to the feed regularly, such as Shenglitai, which can restore the physique of fish quickly, improve the resistance to external parasites and other pathogens, and effectively prevent the outbreak of parasitic diseases.

2, poor water quality environment. Wheelworm parasitism will destroy the gills of the fish, and if the water quality environment is poor, the fish will be infected by bacteria, causing the disease. During the wintering period, due to the less water change in the pond, the metabolic waste of various aquatic organisms accumulates in the water, and after the water temperature rises in the spring, these metabolic wastes decompose quickly and consume a large amount of dissolved oxygen in the water. When the amount of dissolved oxygen is insufficient, a large number of toxic intermediates are generated, which endangers the health of fish. Therefore, after entering the spring, in addition to proper water replacement, it is necessary to maintain the high dissolved oxygen and good water quality environment of the water body, and microecological preparations and disinfectants can be used regularly, such as the source of fermentation (EM bacteria), many bacteria (Bacillus subtilis), etc., which can effectively promote the growth of phytoplankton in the water body and the improvement of water color and fish feeding, prevent the accumulation of metabolic waste, and effectively improve the water environment in which fish live.

3, preventive measures are not done well. Fish bodies more or less carry a certain parasite before wintering, but due to the low temperature in winter, there is no disease. After the water temperature rises, these parasites are easily multiplied in large quantities, causing a large number of fish bodies to be infected. In order to prevent the outbreak of parasitic diseases such as wheelworms, some safe, efficient and pollution-free drugs on the market can be used for prevention.

Note that when using insecticides, it should be noted that insecticides cannot completely kill the parasites in the pond, and the number of parasites is small and harmless to the fish body. Therefore, do not use pesticides frequently to prevent the destruction of the water quality environment.

Fourth, the treatment of wheelworm disease

1. Marine fish can be soaked in fresh water for 5-10 minutes

2, copper ferrous sulfate compound (5:2) 0.7ppm + avermectin solution (1%) 15ml/mu. Rice mixed whole pool sprinkled.

3, 25ppm formalin whole pool spilled.

4. Cypermethrin solution (4.5%) 20-40ml/mu. Rice spilled all over the pool. This method should be used with caution when the water temperature is below 18 degrees, or reduce the dosage.

Note that it is best to choose sunny days and avoid high temperature during the medication time, and it is necessary to turn on the aerator after medication, and it is best to degrade the ammonia nitrogen and sub-salt when they exceed the standard before doing insecticidal treatment.

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