Control of common diseases of cultured Sturgeon

sturgeon bacterial enteritis

1, disease and etiology of this disease is caused by bacteria. Symptoms are abdominal, oral bleeding, anal redness, fish body emaciation.

2. Control method: Feeding with bait containing 0.2% furazolidone for 5-6 days.

sturgeon swollen mouth disease

1. Disease and etiology This disease occurs more frequently in the juvenile stage of Acipenser schrenckii. It is caused by bacteria, mainly because of feeding spoiled bait. Symptoms are swollen mouth, congestion all around, red and swollen excretory holes, unable to move, sometimes accompanied by water mold.

2, prevention and control methods in time to remove the sick fish, remove the residual bait, change the new water, regularly disinfect the feed table, to ensure the quality of feed.

sturgeon trochomycosis

1, disease and etiology pathogen for the wheel worm. Due to pathogens in the fish and gill raker parasitism caused by excessive fish body weakness, slow swimming, not feeding, slow growth, serious death in large numbers.

2, prevention and control methods with 5% salt water immersion for about 1 hour, and then take running water feeding has a good effect; in addition, can also be used 15%-25% concentration of formalin solution immersion, but can not use copper sulfate.

sturgeon helioplomiasis

1. Disease and etiology The pathogen is Inclined tube worm. When a large number of pathogens parasitized in fish, oral cavity, gills, will cause the fish fidgety, body surface was blue-gray film, mouth and eyes increased melanin.

At present, there is no effective treatment method, and the main measure is to transfer the sick fish to the running water pool, and the mortality rate can be reduced to below 4%.

sturgeon trypanosomiasis

1. Disease and etiology The pathogen is trypanosoma. Sick fish slow action, body bending in the water was "L" or "S" shape, often lying in the bottom, can not feed, body color dark, dull, sometimes in the water sharply up and down rotation, if not treated in time, after 3-5 days will die.

The main treatment method is to add 20-40 international units of penicillin G ammonia salt to 5 kg of water for medicinal bath, once a day, 2 hours each time; the dosage of 40 international units on the first day or two, and the dosage of 20 international units after the third day, about 7 days can be cured, and the early cure rate can reach 100%.

sturgeon worm disease

1, disease and etiology This disease is also known as white spot disease. The pathogen is small melon worm. Symptoms: A large number of spots can be found outside the gills and fins when observed with the naked eye. In severe cases, the spots are flaky. Sick fish body increasingly thin, swimming ability weakened and restless, loss of appetite. When observed under a microscope, white dots can be found in dense bubbles covered with white mucosa. Because the small melon insect invades the fish skin and gill tissue, takes the fish tissue cell as the nutrition, causes the fish body tissue necrosis, obstructs the respiration, finally causes the death.

2, control methods with 50 grams per cubic meter of water concentration of formalin soaking has a certain effect; can also increase the water temperature to more than 25 ° C during seedling cultivation, preferably 28-30 ° C to control, the effect is better.

Ichthyodes equinox disease of sturgeon

1. Disease and etiology The pathogen is the disease of equine neck fish lice. This disease occurs more frequently in Chinese sturgeon. Pathogens parasitized on the fin base, anus, nasal cavity, pharynx and esophagus of fish, especially in gill arch and oral cavity.

2, the prevention and control methods generally use artificial removal of pathogens, and coated with antibiotic ointment in the affected area; or the sick fish into 5% salt water immersion for 1-2 hours, also has a good effect.

sturgeon bubble disease

The cause of the disease is that there are too many microbubbles in the feeding water, especially nitrogen and oxygen supersaturation (above 10 ml/L), which makes the fish intestines, gills, muscles and other tissues form microbubbles, and the small bubbles are collected into large bubbles. The sick fish swim slowly, weakly, float to the surface, and swim in the pool. Severe cases in the mouth on both sides of the two grooves, the naked eye can see that there are many linear arrangement of bubbles. When examined under a microscope, the fish gills are white, the mucus between the gills is increased, there are many small bubbles, the gills are intact, the liver is whiter, there is food in the stomach, and there are food, yellow mucus and bubbles in the intestine. Appearance without other symptoms, as if bleeding and death; some are manifested as the whole head worm blood, red and swollen around the mouth, mouth can not be closed. This disease is very harmful.

The main prevention method is to improve the water quality conditions, eliminate the supersaturated gas in the water, and supplement with bait treatment.

third-generation pest disease of sturgeon

1, the disease and the cause of the disease is fed without disinfection of the daphnia caused. This disease mainly occurs in the fry stage, the disease fish mouth around and gills congestion, fry was anoxic floating head shape.

2. Control methods: It is effective to soak fish body with crystal trichlorfon with concentration of 0.25%.

sturgeon haemorrhagic disease

1, disease and etiology The disease mainly occurs in sturgeon larvae stage, is caused by Aeromonas, has a strong infectivity, and rapid onset, rapid spread, mortality is also very high.

2. Control methods During the seedling cultivation period, disinfect with chlorine dioxide or furazolidone every 5-10 days, and regularly add antibacterial drugs to the feed for prevention, and add B vitamins to the feed, such as vitamin C, vitamin E, etc. to improve their immunity.