Common diseases and control of rainbow trout

Rainbow trout is a kind of fish that likes cold water. Because of its delicious meat, good taste and small fishy taste, rainbow trout is loved by many people in the market. The market demand is also being opened step by step, so in order to meet the market demand, the breeding area of rainbow trout is also getting wider and wider. However, the problem of fish disease caused by the breeding process is perplexing farmers. Many novice farmers do not know what diseases fish will suffer from, nor do they know how to prevent and cure them. Today, the editor will give you a brief introduction to the common diseases and control methods of rainbow trout.

1. Infectious pancreatic necrotic disease

Symptoms: pancreatic necrosis is mainly caused by IPN virus, and the onset state is divided into acute and chronic. In the early stage of the disease, rainbow trout will lose their appetite, their body will gradually blacken and their reaction ability will decline. About 30 days after the disease, the sick fish will begin to die. The larger fish will die first, and the belly of the dead fish will bulge. After dissecting the dead fish, it will be found that all the internal organs of the fish have been necrosed and accompanied by a foul smell. The eyeballs of dead fish will also have protruding bleeding.

Prevention and treatment measures: the infectious ability of pancreatic necrosis is strong, and the mortality rate is very high, which can reach more than 90%. If farmers do not pay attention to it and do not take correct prevention and treatment measures, it will lead to huge economic losses. In the purchase of fish fry or eggs to carry out strict quarantine, disinfection of fish eggs to prevent bacteria parasitic invasion of fish eggs. Disinfect everything the fish have access to. If you find a suspected disease, disinfect the water with bleach immediately. After the disease is relieved, give the fish the right amount of vitamin B1 and V.

2. Water mildew

Symptoms: water mildew is mainly injured in rainbow trout, the incidence is higher when there is a wound on the body, the mold in the water will enter the tissue of the fish through the wound and gradually grow to the muscle tissue. Make the protein in the fish muscle secrete a large number of decomposing enzymes, decompose the tissue in the fish and lead to tissue necrosis. After getting sick, the fish will be restless, refuse to eat and go around. If it is not treated in time, it will eventually weaken and die.

Prevention and control measures: first of all, it is necessary to disinfect the environment where the fish live, reduce the existence of molds in the water, reasonably control the culture density, plan the number of ponds, and reduce the injury rate in the process of stocking and fishing in the later stage. If there is an injury, the wound can be smeared with malachite green ointment, and if diseased fish are found, the water in the pond should be changed immediately and all the diseased fish should be transferred to sterile water and raised separately. Bleach can also be used to clean fish ponds.

3. The third generation insect disease

Symptoms: the third generation disease is mainly caused by parasites caused by the third generation of salmon worms. Parasites generally live on the scales and gills of rainbow trout. If the disease is serious, the epidermis and gills will be damaged to varying degrees. The diseased fish begin to breathe rapidly and lose their appetite. A layer of white mucus will appear on the epidermis, which will also have an effect on rainbow trout.

Prevention and control measures: it is still necessary to ensure the cleanliness and hygiene of the fish ponds and sterilize the fish ponds with quicklime. It is found that sick fish can use potassium permanganate to bathe the fry in the ponds, which is the best way to control the third generation insects.

The above three are the common diseases and control measures of rainbow trout sorted out by editors. in fact, you may also see that the first way to prevent diseases is to clean fish ponds and spray quicklime to sterilize them. In fact, it is mainly because the fish live in the water, we can not clearly observe every fish, can not detect the occurrence of diseases in time, so the most important thing is to prevent, and sometimes we have to wait until the fish is dead and float on the water. You knew the fish was sick, but it was too late. Therefore, I hope that everyone must pay attention to the cleanliness of fish ponds and reduce the incidence of disease.