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White skin disease, powder disease, melon worm disease, microsporangiasis, acne disease have the same point: the surface of the sick fish body has white spots
Differences:
White dermatosis: white spots appear at the base of the dorsal fin or at the caudal stalk, and when the disease develops, only the area of the white spot itself expands, and eventually manifests as the entire posterior skin bounded by the dorsal fin to the fin is white;
Fever: White spots appear in the dorsal fin, caudal fin and back successively, but as the disease worsens, the number of white spots increases, and eventually the white spots spread throughout the body, and the white spots on the entire body seem to rub a layer of powder
Small melon worm disease: the pathogen is small melon worm. Look closely at the engorged erythema between the white dots, and the surface of the body, fins, or gills are covered with sacs with small white dots
Microsporidiosis: 2 to 3 hours after the death of the diseased fish, observe the site of its disease, there are still white spots caused by microsporidium, if there is no white spots are caused by small melon worms;
Acne disease: although the characteristics are similar to that of small melon worm disease, small melon worm disease can be seen under the light microscope, while the acne disease can not see the pathogen under the light microscope;
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White-headed white-mouthed disease, wheelworm disease, hook-and-mouse worm disease fish disease have the same point: sick fish all appear white-headed and white-mouthed
Whitehead white mouth disease: dermoscopic examination of scraped sick fish, visible peristaltic bacteria;
Wheelworm disease: the larger wheelworm mainly invades the skin of juvenile fish, it is distributed throughout the body of the fish, especially likes to gather on the fins and head of the fish, and sometimes appears on the gills;
Hookworm disease: the naked eye can see the disease of the fish mouth, fins and skin have hookworm parasitism;
Similarities between wheelworm and ringworm disease: gill lids will open;
Differences: Wheelworm disease has typical symptoms such as whitehead white mouth and bright red gill silk; ringworm disease: the gills are obviously puffy, and the gills are dark blue
Similarities between vertical scale disease and cyprinid uterine nematode disease: scale bulge;
Differences:
Carp uterine nematode disease, the degree of scale bulge is larger, the skin muscles of the parasitic site of the worm are hyperemia and inflammation;
The scales of the fish with vertical scaly disease are erect like pineal spheres, and the edema at the base of the scales is translucent and small sacs, and the water is squeezed out.
Similarities between madness, Chinese loach disease, greater Chinese loach disease, silver carp chinese loach disease, anchor head loach disease, and compound fluke disease: with restlessness, wild swimming, jumping phenomenon;
Madness disease: the sick fish has a spine bent in the direction of the back, the entire tail is extremely upturned and exposed to the water, in a wavy rotational motion, sometimes sinking to the bottom, sometimes exposing the water;
Chinese loach disease: the spine is not curved, the caudal fin is only exposed to the water surface, and the diseased fish only spins or swims wildly on the surface of the water body
Greater Chinese gill disease: parasitic on the gills of grass and green fish, and the sick fish jump restlessly;
Silver carp Chinese gill disease: parasitic salmon, scaly gills, sick fish generally do not jump;
Anchorhead bream disease: when severely infected, the body of the fish resembles a coat;
Compound fluke disease: struggling uneasily on the surface of the water, sometimes head down, tail up, severe cases of eyeball shedding into blindness and other symptoms;
Similarities between horse racing, pan pond and trichoces algae: fish gather around the edge of the pool or hit the shore with their heads;
Horse racing disease: just swim around the pool, drive away;
Pan pond: generally occurs in the absence of wind, sweltering heat, temperature rise, air pressure drops, thunder does not rain or thunderstorms, occurs after midnight; All the fish in the pond float on the surface of the water, breathing with their mouths open, or lying on the surface of the water or hitting the shore with their heads, in a state of dying;
Small trichonus algae: most of the fish often swim wildly, and the general pond fish concentrate on the four corners of the pond and disperse; When the illness is severe, the pond fish are concentrated near the surface of the water at the edge of the pool, with their heads facing the shore, stationary;
Grass carp viral hemorrhagic disease and grass carp bacterial erythroderma are similar: redness on the body surface and hyperemia of the fins.
Grass carp viral hemorrhagic disease: redness on the surface of the body is caused by muscle congestion and bleeding, after peeling off the epidermis, its muscles are lumpy or punctuated, and even the muscles of the whole body are congested, bleeding is red, and the fins are engorged near the base of the muscles.
Grass carp bacterial erythroderma: redness on the surface of the body, only epidermal bleeding, not muscle congestion, bleeding, peeling, the muscle color is normal, not red, the fin (especially the caudal fin) hyperemia, at best, is only at the end of the fin.
Bacterial enteritis of grass carp is similar to viral enteritis of grass carp: there are generally symptoms of redness of the intestinal mucosa.
Grass carp bacterial enteritis: there is pus-like fluid on the surface of the intestine, and ulceration. Grass carp viral enteritis: the surface of the intestine is red and swollen, no mucus, no ulceration