Bending disease, also known as deformity and tail slapping disease. Fish suffer from leptospirosis for two reasons. First, because the water contains heavy metal salts, it stimulates the nerve and muscle contraction of fish. In the newly opened fish ponds, because the heavy metal salts in the soil are dissolved in the water, fish species suffer from leptospirosis more often. Most of the heavy metal salts in the soil have been dissolved in the old fish ponds that have been raising fish for a long time, so this disease is generally not easy to occur. Second, fish suffer from rickets due to calcium deficiency. The main symptoms of fish suffering from leptospirosis are "S"-shaped bending, some fish are bent in two or three directions, some fish's tail is bent, some fish's gills are sunken, or their mouths are deformed on the upper and lower palates and fins.

Prevention and cure method

1, the newly-opened fish pond will be raised first 1-2 years, and then the fish seedlings and fingerlings will be raised later;

2. Inject fresh water into the diseased fish pond frequently to improve the water quality;

3. Strengthen feeding management and feed more nutritious bait;

4. If calcium is deficient, add 0.5 kg lime to 5 kg soybean milk, and the effect is better.