1. Common fish diseases
1. Hyperemia, inflammation and scale shedding on the surface of the body are mostly erythrodermal disease; only the gill cover or fin base is congested, the skin congestion is not obvious, and the muscles are congested or blocky and bruised when the epidermis is torn open; the abdomen is enlarged, the anus is red and swollen purple, and there is a milky yellow liquid flowing out of the abdomen under light pressure for enteritis; there are fire-like erythema or epidermis rot on both sides of the tail stalk and abdomen; the white matter with cotton on the body surface is water mold; the body surface mucus is more and has the size of millet grains, and the insect body shaped like a bed bug is a weel disease White highlights on the surface of the body, and small melon worm disease when the bright spots disappear after two hours from the water; white spots on the body surface, bleeding between the white spots or red spots are ovichophyll algae; inflammation and redness at some scales, red spots and parasitism accompanied by needle-like insects are anchor head loach disease; fry and fish species swim wildly around the pond or on the surface of the pond, and the head is congested with red spots, and the death is frequent and rapid, generally wheelworm disease; the white skin of the sick fish tail disease is white skin disease; the head or mouth of the diseased fish is obviously folded in the water. After leaving the water, it is not obvious that the white-headed white-billed disease is not obvious; the protruding lower lip of the fish is dustpan-like, which may be caused by the lack of oxygen floating head in the pond; the eyes of the diseased fish are prominent, or even fall off, and the scales are loose, which is generally caused by the toxicity in the pond; the curved body of the fish may be due to the high content of heavy metal ions in the pond water, or organophosphorus poisoning.
2, gill filament rot whitish, tip cartilage exposed, and sludge and mucus is rotten gill disease; gill filament whitish is anemia, most likely gill mold or coccidiosis; gill filament end hanging like fly maggots white worms are Chinese gill disease; gill puffiness, gill cover can not be closed, gill filament loss of bright red and dull color is ringworm disease; gill filament is purple-red, accompanied by a large amount of mucus is caused by organochlorine poisoning; gill filament is purple-red, and less mucus may be caused by the lack of oxygen in the pond.
3. All or part of the intestinal tube is red in congestion, and the intestinal wall is not inflamed, it is hemorrhagic disease; if the congestion is inflamed and accompanied by a large amount of milky yellow mucus, it is enteritis; the intestine is white and the anterior segment is enlarged, and there are many white flocculent nodules in the inner wall of the intestine.
Second, similar fish diseases
1. Viral enteritis and bacterial enteritis and intracultural amoeba disease, the intestines of fish with these three diseases are red. There are many sites of bleeding caused by the virus, and symptoms of amoeba disease in the hind intestine are manifested.
2. The dorsal fin, caudal fin and back have white spots, which gradually increase with the aggravation of the disease, and finally the white spots spread throughout the body, which is powdering; the white spots of white skin disease only appear at the base of the dorsal fin or the tail stalk, and finally appear as the entire posterior skin of the dorsal fin to the fin is white.
3. Coccidiosis, side breeding trematodiasis, Xu's tapeworm disease, Jiujiangtou trochanter tapeworm disease, echinoccus disease and echinoderosis of carp longifolia have symptoms of intestinal wall expansion or intestinal blockage to varying degrees. Side breeding trematodiasis and Jiujiangtou taeniasis have obvious symptoms of not eating food with closed mouth and open mouth without eating, respectively. Coccidioides are mainly parasitic in bluefish, and Taenia sylvestris and Echinaceae carp are only parasitic in carp; but the latter are generally parasitic in the foregut, with inflammation, swelling and ulceration of the intestinal canal in severe cases, and perforation of the intestinal wall. Echinococcus mainly harms grass carp.
4. Scale uplift symptoms Fish disease mainly include carp uterine nematode disease and vertical scale disease. The former has a large degree of scale bulge.
5. Crazy sick fish has the characteristics of bending the spine to the back direction, the entire tail training is extremely upturned and exposed to the water surface, showing a wavy rotational movement, sinking into the bottom of the water for a while, and exposing the water surface for a while; the spine of Chinese loach disease does not bend, the tail fin only exposes the upper leaf to the water, and the diseased fish only spins or swims wildly on the surface of the water body.
6. Gathering around the pool or hitting the shore with your head may be horse racing, flooding the pool or fish poisoning caused by small trichoderm algae. The former is only around the pool, it is difficult to disperse; the pan pond generally occurs in the absence of wind, sweltering heat, temperature rise, air pressure drops, thunder does not rain or thunderstorms occur after midnight, the whole pond fish float on the water surface, with the mouth open to breathe, or lying across the water surface or head hit the shore, showing a state of dying; small trichoderma often has most of the fish swimming wildly, the general pond fish to the four corners of the pool concentrated, dispersed, when the disease is serious, the pond fish are concentrated near the surface of the pool, the head to the shore, stationary.
7. "Aconitum" includes enteritis and bacterial gill disease. The body color is black, and the head is dark. The difference is that the former abdomen is swollen and erythematous, the hand is soft, the anus is red and swollen, and there is milky yellow mucus flowing out of the abdomen under light pressure; the epidermis in the gill cap of the latter is often hyperemic. It is worth noting that these two diseases often occur on the same fish body.