How to prevent carp gill rot disease with high mortality rate

In recent years, the intensive aquaculture has led to the outbreak of large-scale acute Gill rot disease in carp culture areas. Gill rot disease comes rapidly, highly contagious, high mortality, but the symptoms are not obvious, so that fish farmers are unprepared. Next, let's take a look at the preventive measures of Gill rot disease of carp together with the editor.

Carp culture

First, the classification of Gill rot disease: the etiology of Gill rot disease of carp has been inconclusive. In the early study, Gill rot disease was caused by parasites and bacterial viruses, but the latest research results showed that Gill rot disease was mainly caused by viruses, and its clinical manifestation was similar to that of bacterial infection and parasite invasion. therefore, it can not be judged simply by observing the external characteristics or clinical manifestations of carp. 1. Caused by parasitism of ring worms; 2. Caused by parasitism of rotifers; 3. Caused by the simultaneous parasitism of ring worms and rotifers. Bacterial Gill rot; 5. Viral Gill rot.

Second, the reason: 1. The stocking density is too high; 2. Feed nutrition is not comprehensive; 3. The amount of feeding is too large.

3. Preventive measures:

For the prevention and treatment of acute Gill rot of carp, it is emphasized that "prevention is more important than treatment". Early prevention and treatment, the earlier the better. If the prevention work is done well, the fewer carp diseases will be. Prevention and control measures:

1. Clear the pond and disinfect the carp. Before releasing the carp fry, the fish pond is thoroughly cleared, and the summer flower carp with the same source and strong physique are released. When the carp fry are released, the carp fry use 2% Mel 4% salt water medicine bath 5~~20min. The recommended stocking density of carp is 600mur1000 carps / mu, and the yield per mu is 1500 jin / mu-2000 jin / mu.

two。 Improve feed quality; improve additives, such as microecological agents, Chinese herbal medicine, etc., add appropriate amount of Vc to enhance the immunity and resistance of carp.

3. Adjust water quality; water depth, depth is moderate, transparency is between 10~30cm.

4. Reasonable exchange of water and oxygen; especially in rainy days or winter, there is plenty of fresh oxygen in the fish ponds.

5. Prevent in advance; sprinkle disinfectant around the fish pond once or twice every half a month, usually using 250g 500g bleach. Chinese herbs such as Eucalyptus grandis, Phoenix tail grass, Artemisia argyi and camphor leaves are bundled in water regularly and turned over every other day.

6. Cut off the route of transmission; implement isolation, first block the infected carp ponds or areas, and do not mix the tools in other ponds without disinfection. Diligently patrol the pond, find the sick and dead carp, bury and destroy in time.