Urgent! How to raise grass carp in October and prevent diseases!

Autumn is not the season with a high incidence of fish diseases, so pay attention to normal disinfection.

In autumn, the water is cooler, and the incidence of water mildew is higher than usual.

1. Forage selection.

The forage should be selected parallel veined long-leaved green grass, not reticulated veined mass leaf forage, and now grass carp farming is mainly fed rye grass, Sudan grass and wild long-leaved grass. And when feeding, we should carefully observe the grass carp eating grass, see what kind of forage it likes to hate, and feed those who like to eat to promote its rapid growth, and try to feed less or not feed those who are anorexic.

2. Fresh and tender terrestrial aquatic plants.

Try to choose fresh and tender aquatic plants, this is because the fresh and tender grass has less cellulose, which is easy to be digested and absorbed by grass carp, if the grass is not fresh when aging, there is more cellulose, and it is not easy for grass carp to digest after eating. According to experimental studies, grass carp can grow about 1 kg of terrestrial aquatic weeds by eating about 15 catties of terrestrial aquatic weeds, and eating about 60-80 catties of aquatic aquatic weeds can grow one catty, so in the case of sufficient terrestrial aquatic weeds, try not to feed aquatic aquatic weeds.

3. Feed according to the size of the fish.

When feeding, we should also pay attention to the size of the diameter of the fish, such as the diameter of the juvenile fish is less, it is not suitable to feed coarse, hard forage, suitable for feeding algae such as duckweed, or chopping the forage for feeding. As the grass carp grows, the caliber increases and slowly transitions to normal forage.

4. Feeding method.

When feeding, we must be regular and sufficient every day, so that the grass carp is full, and the grass should be evenly spread when feeding, and it should not be sprinkled directly in one place, which is easy to cause the phenomenon of grass carp grabbing. Feeding should be best in the morning during the day, feeding in the morning, and the forage can be eaten at night to prevent the forage from staying overnight, ensuring the freshness of the forage, and it is strictly forbidden to feed the spoiled mildew or contaminated forage, which will lead to an increase in the incidence of grass carp and make it infected with diseases.

1. Parasitic fish diseases: such as Chinese eel, three generations of insects, etc., sprinkle the whole pool with kilograms of insecticide king per mu, once every other day, and use it twice in a row.

2. Enteritis, gill rot, erythroderma: After finding that grass carp species have a certain number of deaths due to the "three diseases", the amount of concentrate feed should be reduced immediately or not fed concentrate feed, nor green feed. After stopping feeding for 3-5 days, a small amount of green fodder mixed with enteritis rotten gill spirit was put in, and the amount of green fodder was slowly increased in the future.

After the fish disease is relieved, a small amount of concentrate is fed. 5 kg of rhubarb drying tablets per mu (crushed), soaked in concentrated ammonia for more than 14 hours, splashed in the whole pool, and used for 3 days. 1 kg of turnip was adhered to with 99% purity kanamycin powder, and the feeding amount was about the weight of the fish for 1 week.

Note: When the grass carp species suffer from the "three diseases" is more serious, avoid using chlorine-containing drugs such as bleaching powder, chlorine dioxide, etc. Otherwise, there will be mass deaths of diseased fish species.

Add a small amount of potassium permanganate to the water very powerful.

1. Common diseases.

1. Enteritis disease: bacterial disease, mainly manifested as intestinal redness, congestion or bleeding, etc., and the intake of grass carp will be significantly reduced.

It is recommended to take SECCO "Jun Wuying" drug internally for prevention and treatment.

2. Hemorrhagic disease: viral disease, small size grass carp is very likely to occur, mainly manifested as body surface, gill cover, muscle, intestinal congestion, etc.

It is recommended that Wenlik can be used for prevention and control.

3. Gill rot disease: bacterial disease, mainly manifested as black gill tissue, silt, and gill filament rot.

It is recommended to sprinkle quicklime on the whole pond of the fish pond for control. Serve the mixture with no shadow and feed it internally.

4. Erythroderma: a bacterial disease, which is mainly manifested as the local scales on the surface of the fish body falling off, and the lesion site is red and bleeding.

It is recommended to use disinfectants, quicklime and internal administration, etc., which have obvious effects.

5. Parasites: parasitic diseases, parasitic diseases may occur in grass carp of various specifications, mainly manifested as gill filaments do not rot, mucus is more, and the parasite category needs to be confirmed by microscopic observation.

The corresponding insecticide can be sprayed, and the SECCO "Chejing" mixture can be used internally.

Prevention of grass carp diseases.

1. Do a thorough dredging and disinfection of the old fish pond. According to the substrate and water quality conditions of the breeding pond, drugs such as quicklime or bleaching powder are selected for thorough disinfection.

2. Control the quality of fish fry. Inactivated vaccine is injected into broodstock, and the introduced fry should be introduced from a seed base with quality assurance.

3. Control the proportion of fry stocking.

4. Control the quality of feed and feed it reasonably.

The <> feed is mainly full-price grass carp pellets, supplemented by green feed. The protein content of pellet feed is more than 28%, and the particle size is 4-6 mm.

After grass carp is fed and domesticated, it will form a habit of concentrated grabbing. Feed at regular times and at fixed points every day, and feed for 30 minutes each time. Feeding is done twice a day, from 9 to 10 a.m. and once from 4 to 5 p.m., at a daily feeding rate of 3% of the fish's body weight.

It should be noted that pellet feed and green feed should not be fed at the same time, if fed at the same time, it will affect the fish's intake of pellet feed, resulting in pellet feed is not eaten by the fish and wasted.

Generally, green feed is fed first and then pellet feed, and there should be a certain interval between the two. Because grass carp is greedy and the amount of food is uncontrolled, it is necessary to avoid eating too much at night to prevent grass carp from getting sick and dying. The amount of evening feeding should be strictly controlled before the evening, and it is advisable to eat night food.

In case of intake of large quantities of food at night, it is necessary to strictly monitor its dynamics, start the aerator or fill with new water in advance.

In the summer and autumn high temperature season, from 10 o'clock to sunset, the surface temperature of the water body is high, and the grass carp is unbearable, so the bait and green bait in the food rack are fed, and the grass carp is less fed. A shade canopy can be built on the food rack to reduce the low temperature, so that the grass carp can feed smoothly during the day and avoid a large amount of feeding at night. Grass carp like the environment with fresh water quality, during the breeding period, it is necessary to add new water frequently to adjust the water quality, keep the dissolved oxygen in the water not less than 4 milliliters, and splash it with 10-20 milligrams of quicklime every half month, adjust the pH value of the pool water, keep it within the range, and prevent the anorexia of grass carp caused by the low pH value of the water body.

Turn on the aerator frequently to prevent the fish from floating their heads.

Strengthen the prevention and control of fish diseases. Grass carp is susceptible to enteritis, so the forage must be strictly disinfected, and a certain amount of antibiotic bait is often fed once a day for 3 days.