Cyprinidia is a single-celled parasite of the ciliate family. The living insect body can borrow the cilia of the abdomen to move slowly along the gills or skin. The reproductive mode of the insect is asexual transverse division and sexual joint. The lateral side of the carp is dorsal bulging and ventral surface flat, thinner at the front and thicker at the back. The ventral surface is approximately ovate, the left and right sides are not very symmetrical, the left side is straighter, the right side is slightly curved, and there is a small depression in the posterior end, like a heart. There are several ciliary lines of varying lengths on both sides of the ventral surface, with 9 on the left and 7 on the right. Cilia grow on the cilia. The ventral surface has a funnel-shaped mouth tube at the front end. The large nucleus is nearly rounded, the small nucleus is spherical, and the two extended bubbles are one in front of the other, which is also the origin of the name of the oblique tubeworm.
Trenches, darkness, moderate temperature, feces, sewage, silt, humus are the conditions and bases for the production of oblique tubeworms. The water temperature suitable for the propagation of oblique tubeworms is 8-18 degrees Celsius. Therefore, March-April and November-December are the epidemic seasons of the disease. Summer and autumn are rare. After leaving the fish body, the inclinated tube worm can maintain its life in the free state of water for 1-2 days, and can be directly transferred to other fish bodies or water bodies. Fish in fingerling ponds and small artificial water environments are most sensitive to intrachosis infections, and trapezia are the enemies of fry and can cause severe deaths.
Bulbophyllum mainly attacks the gills and skin of fish, feeding on the gills and mucus on the skin. When the fish is parasitic in large quantities by intrachodiasis, the gills and skin of the fish are damaged, and the skin and gills are stimulated to secrete a large amount of mucus, making it difficult for the fish to breathe, and the fish body is thin and black, swimming slowly, and then dies.
When a small amount of oblique tube worms parasitize, it is not harmful to fish, and when a large number of parasitisms are stimulated, the body surface and gills of the fish secrete a large amount of mucus, and the body surface forms a layer of mucus that is pale or blue, the gill tissue is seriously damaged, the diseased fish have difficulty breathing, and the fish fingerlings and fry stages are particularly serious.