Parasitic diseases are one of the common diseases of aquaculture animals and a major problem for farmers. In the process of breeding, in order to effectively prevent and control parasitic diseases, regular insecticide has become one of the important tasks of farmers. But in fact, the use of a large number of insecticides in breeding will not only fail to effectively eliminate parasites, but also lead to increased resistance of parasites, and also easily damage the ecological balance of the breeding environment. The focus of the control of parasitic diseases is on prevention, not treatment.
<h1>1. Cryptofloasis</h1>
Cryptocephalus or frilling cryptofloa parasitizes the gills of fish, and the body of the fish is clinically seen to become black, the gills are bright red, and there is a lot of grayish-white mucus. Parasitic on the surface of the fish body, the fish body is thin. It mainly harms summer grass carp, carp and carp fry.
<h1>2. Filaria spp</h1>
There are no obvious symptoms in the early stages of the disease, and when the disease is severe, the body color turns black, it is obviously emaciated, it swims slowly, it is difficult to breathe, and the gills and skin are covered with a layer of gray and white mucus. The gills are reddish or the skin is hyperemic and inflamed, and the scales are easy to fall off.
<h1>3. Wheelworm</h1>
Rotifers invade fish bodies and gills, sucking up tissue cells for nutrition, causing severe damage to the skin and gill tissue of juvenile fish. Sick fish show weakness, emaciation, solitude, diet loss, slow movement, and in severe cases can lead to fish death.
<h1>4. Fish and seaweed</h1>
The surface of the diseased fish can be seen as bed bug-like or rice-grain-shaped large insects, the head of the fish has red spots, the fish body is pale green, restless, clustered on the surface of the water for jumping and swimming action.
<h1>5. Chinese loach</h1>
The gill wire is visible to the naked eye with small maggot-like insects hanging from the ends of the gills, and the sick fish are restless, jumping in the water, and sometimes the fish's tail is vertically exposed to the water.
<h1>6. Oblique tubeworm</h1>
Intrachomaratia invade the skin or gill tissue of fish, and the invaded area secretes a large amount of white mucus, which appears to have a pale blue film. Sick fish lose food, lose weight, have difficulty breathing, and float to the surface.
<h1>7. Coccidiosis</h1>
There are no obvious symptoms on the appearance of the sick fish, only a loss of appetite. Dissection of the intestine may reveal small gray-white nodules on the lining of the intestine, ulceration around the nodules or perforation of the intestine.
<h1>8. Small melon worms</h1>
Many small white dots can be seen on the surface of the body, fins and gills of the diseased fish. The fish is emaciated, swims slowly, and floats on the surface.
<h1>9. Tongue cupworm</h1>
The diseased fish have no obvious symptoms, but are slow to move, the fish body is emaciated, blackened, and swims alone.
<h1>10. Straw worms</h1>
The sick fish is anorexic, emaciated, pale, bright red in the gills and has a large amount of off-white mucus. The gills or skin that are parasitic by the insect form a depression, and the fish have a special fishy odor, have difficulty breathing, and swim alone on the surface of the water.
<h1>11. Anchorhead bream</h1>
The surface of the sick fish can be seen in the gray-white anchorhead, the tissues in the invaded area are red, swollen and inflamed, and the sick fish are uneasy, often jumping on the surface of the water and swimming alone.
<h1>12. Iodosporidium</h1>
Cyprinidia iodine blisters often parasitize carp, crucian carp, and carp, forming gray-white dot-like or nodular sacs. Sacs appear under the scales.