Sensory identification of fish diseases

(1) intestinal diseases

1, hemorrhagic muscle, oral cavity, the base of all kinds of fin is congested, especially the anal fin. Peeling off the skin shows muscle punctate bleeding, and all the seriously sick muscles are red. Sometimes there is congestion in the Gill cover, jaws, circles of the eyes and intestines of diseased fish; the gills lose bright red, or show pale.

2, enteritis anal redness and swelling, severe pressure on the abdomen with purulent blood or yellow mucus outflow from the anus, some or all of the intestines are inflamed, showing purplish red.

3. The Gill filaments of coccidiosis are pale, in severe cases, the abdomen is slightly enlarged, and there are many rice-like coccidia cysts in the inner wall of the front of the intestine.

(2) skin diseases

The main results are as follows: 1. Red skin rot or fin decay, local or most of the body surface is congested, inflamed, and scales fall off, especially in the abdomen.

2. Printing disease, which is rotten from the outside. There are round, oval or oval erythema on both sides of the tail stalk or abdomen of the diseased fish. in severe cases, small holes appear in the muscles, showing bones or internal organs.

3. The skin from the back of the dorsal fin to the end of the caudal stalk of leukoderma is white and foggy, which is significantly different from the color of the front part.

4. Furunculosis is caused by internal rot. There are puffy abscesses on both sides of the back of the diseased fish, and there is a feeling of edema on the touch. Cut off the skin of the diseased fish and the muscle is purulent.

5. White head and mouth disease often occurs in fish fry and early summer flower stage. The diseased fish are thin and black, float on the shore, whiten the top of the head and around the mouth, and rot in severe cases.

6. The body surface of the fish with water mildew disease looks like old cotton wool, and finally the diseased fish is emaciated to death.

7. The Gill of rotifer fish is congested, the head is red, and sometimes white around the mouth. When the illness is serious, sick fish often cluster on the edge of the pond.

8. The mucus on the body surface of oblique trichomoniasis fish increased, and a light blue gray film was often formed on the surface.

9. The body surface and fins of the diseased fish are covered with white dot-like pustules.

(3) other diseases

The main results are as follows: 1. The body surface of the diseased fish is rough, and some of the scales (mostly in the tail) open outward like pine balls, forming hard scales, and transparent liquid is gathered under the scales. Diseased fish are sometimes accompanied by exophthalmos, abdominal swelling, and subcutaneous hyperemia near the fin base.

2. Crazy sick fish are thin and dim, and the back half of the fish is warped up, often in circles on the surface of the water. Opening the skull of the diseased fish, white dotted myxosporidium cysts can be seen.

3. The abdomen of the fish with tongue tapeworm disease is enlarged, and the colored banded worm body in the body cavity can be seen by cutting the abdomen.

4. the brain of the fish with clonorchiasis is congested, the mouth is white, and the eyeball is protruding or even falling off. Some diseased fish eyes are opaque and milky white.

5. There is a hole the size of soybeans at the base of the pectoral fin of the fish with strange disease.

6. The whole body of the diseased fish is like a layer of rice noodles.