How to increase the output of grass carp in that year

The key to improve the output of grass carp fingerling is that the feeding and management methods should be in line with the living habits of grass carp, to achieve and maintain fresh water quality, no disease sources, high dissolved oxygen content, corresponding feed, disease prevention and control measures to keep up.

First, do a good job of pond disinfection and fish body disinfection

In ponds where fish species are raised, do not disinfect them in ponds or shallow water, because in doing so, water must be added before grass carp fingerling is released, which will bring pathogens into the sterilized ponds and increase the source of infection. Therefore, after pouring the pond water to the normal fish culture level, 20 days before the release of fish fry, 150 kg of raw right ash per mu of water depth should be sprinkled and disinfected in the whole pond into lime milk. The slope around the fish pond should also be spilled, and weeds should be removed at the same time. Put an end to insects laying eggs in the pond.

Fish body disinfection is a work that must be done before summer flowers enter the pond. if unsterilized fish species are allowed to enter the pond directly, they will carry human pathogens under certain conditions, such as water temperature, water quality, weak fish physique and other conditions, and the pathogens will develop rapidly. fish disease will break out, so that the previous efforts of pond cleaning disinfection will be wasted. Fish body disinfection-wash with 5% concentration of salt water, or bathe with 20ppm potassium permanganate solution to eliminate parasites and bacteria on the fish surface. The method is as follows: put the past fish into a larger container, calculate the water volume of the container, then calculate the dosage, and the time to wash the fish should be determined according to the fish's physique, water temperature, etc., generally 15-20 minutes, if grass carp floating head is found It shows that the lack of oxygen in the water and the fish can not stand, at this time quickly put the fish into the pond.

How to increase the yield of grass carp in the same year

The key to improve the output of grass carp fingerling is that the feeding and management methods should be in line with the living habits of grass carp, to achieve and maintain fresh water quality, no disease sources, high dissolved oxygen content, corresponding feed, disease prevention and control measures to keep up.

First, do a good job of pond disinfection and fish body disinfection

In ponds where fish species are raised, do not disinfect them in ponds or shallow water, because in doing so, water must be added before grass carp fingerling is released, which will bring pathogens into the sterilized ponds and increase the source of infection. Therefore, after pouring the pond water to the normal fish culture level, 20 days before the release of fish fry, 150 kg of raw right ash per mu of water depth should be sprinkled and disinfected in the whole pond into lime milk. The slope around the fish pond should also be spilled, and weeds should be removed at the same time. Put an end to insects laying eggs in the pond.

Fish body disinfection is a work that must be done before summer flowers enter the pond. if unsterilized fish species are allowed to enter the pond directly, they will carry human pathogens under certain conditions, such as water temperature, water quality, weak fish physique and other conditions, and the pathogens will develop rapidly. fish disease will break out, so that the previous efforts of pond cleaning disinfection will be wasted. Fish body disinfection-wash with 5% concentration of salt water, or bathe with 20ppm potassium permanganate solution to eliminate parasites and bacteria on the fish surface. The method is as follows: put the past fish into a larger container, calculate the water volume of the container, then calculate the dosage, and the time to wash the fish should be determined according to the fish's physique, water temperature, etc., generally 15-20 minutes, if grass carp floating head is found It shows that the lack of oxygen in the water and the fish can not stand, at this time quickly put the fish into the pond.

Second, cultivate fresh and palatable bait

After the fish pond was disinfected, about 10 days before the summer flower went down the pond, 300-400 kg / mu of human organic fertilizer was applied as the base fertilizer, and 30-40 kg of manure water or 1 kg urea plus 0.5 kg calcium superphosphate was diluted every 2-3 days per mu, then sprinkled in the whole pond to cultivate a large number of water fleas, accelerate the division and reproduction of Wuping and duckweed, so that grass carp can eat rich fresh palatable bait when they go down to the pond, and in the stage of water quality cultivation. It is necessary to observe the changes of water quality at any time and find that frog eggs are fished out in time. If blue-green algae multiply in large numbers, 0.7ppm copper sulfate can be used to sprinkle them in the whole pool.

Third, change the traditional methods of fish stocking.

In the production practice, I changed the traditional method of mixed culture of grass carp in silver carp pond, and adopted the method of sparse cultivation, which accorded with the habit requirements of grass carp. Grass carp species were sparsely released, and fish with large size and good quality could be obtained. in order to solve the problem of decomposing grass carp feces and turning water quality into fertilizer, we can also match a small amount of silver carp, but do not put additional bait and fertilize, but only rely on grass carp excreta to cultivate plankton as bait. In the ponds where grass carp are mainly raised, 8000 grass carp with 4-5 cm per mu, 1000 silver carp (the proportion of silver carp and bighead carp is 4:1), crucian carp and boat fish can be stocked per mu. When stocking, grass carp should be released 15-20 days earlier than other farmed fish, in order to facilitate the growth of grass carp and improve the survival rate.

IV. Methods of feeding and management

When grass carp summer flowers enter the pond, they are not used to eating green fodder. Soybean milk and soybean cake milk must be fed to improve the survival rate and growth rate of grass carp fingerling. 1-3 kilograms of soybeans are used every day and 15 kilograms of soybeans are soaked in 15 kilograms of water per kilogram. No additional water is added when grinding.

When grass carp grow to 5-7 cm, if they can eat Wuping, they can no longer feed soybean milk. Wuping is nutritious, grass carp likes to eat and is easy to digest, and does not pollute the water quality. years of practice has shown that grass carp fingerling cultivated with Wuping has good physique, strong disease resistance and less disease. You can surround several food farms around the pond, with 4 per mu as good. Put Wuping and so on in the food field and feed them twice a day. The amount is determined according to the feeding situation of grass carp, and the limit is 4-5 hours. When the growth of Wuping is coming to an end at the end of September, crushed vegetable cakes or bean cakes, 10 kg per mu per day, are fed twice in the morning and afternoon, and put on the food table under the water until the fish species merge with the pond.

During the breeding period, we should also continue to patrol the pond every morning, middle, and evening, check the floating head of the fish in the morning, check the activity of the fish in the afternoon, check the water quality in the evening, frequently catch the residual bait and prevent fish disease, start the aerator regularly, catch the enemy damage entering the pond in time, and conscientiously do a good job in Tangkou files. find problems and deal with them in a timely manner.

5. Master the water quality well

The pond where the main grass carp species are raised requires the transparency of the water to be 60 cm, but after the grass carp species ingest a large amount of food, their own excreta will also affect the change of water quality, so add water once in the early 3-5 days and 5-10 cm every time from July to August 2-3, so as to keep the water body fat, alive, tender and cool, and provide a good growth environment for grass carp. When changing water, we should pay attention to the escape of fish species and the entry of wild fish.

VI. Do a good job in the prevention and control of fish diseases

In the season when fish disease is prevalent, regular spraying of drugs and oral bait are used to prevent and cure fish disease. From mid-June to early October, disinfect alternately with quicklime (1 meter water depth per mu, 20 kg) and bleach (1 meter water depth per mu, 700 grams per mu, chlorine content is 30%). Bait every 15 days for three consecutive days. The method is to dissolve the bow with 10 grams of allicin per 100 kg of fish: stir well with a small amount of binder in water and sprinkle evenly on Wuping, while turning Wuping. After 15 minutes, wait for the medicine solution and Wuping to stick firmly into the food field, or 5 grams of grass carp Sanshanling for every 100 kilograms of fish dissolve in 2.5 kilograms of water and 10 kilograms of dried barley to be absorbed, then add 2 kilograms of water until the barley is full, and feed it for three consecutive days. These methods can be used as prevention or treatment, and the condition can be treated by a course of treatment. Adhere to the above methods, the routine prevention and treatment of fish disease, the source of the disease will be controlled and eliminated, and pond fish rarely suffer from the disease.