The pond area of bighead carp fry culture is 115115hm2, and the pond depth is about1and 5m. The dam is firm and watertight; The bottom of the pool is flat, with proper silt and no overgrown weeds; The fish pond is sunny and sunny. And it must be cleaned before stocking.

2, fried stockings.

In the past, the stocking specification of bighead carp in lakes and reservoirs was generally 13. 2㎝ For large fish species, under modern technical conditions, 0 is required. 15—0。 5kg/ tail or even 1, 0kg large fish species.

Quarantine and disinfection: Quarantine and disinfection of fish diseases must be carried out before the fish stocks are put into storage. It is strictly forbidden to store fish with infectious diseases in the warehouse.

Caution: After the long-distance transported fish species are transported to the reservoir, they should be slowly added into the fish container with reservoir water, and then slowly put into the reservoir when the temperature difference between the water in the container and the reservoir water is not great. After being put into the reservoir, the stocking personnel should also stand on the edge of the reservoir or on the boat, gently stir the reservoir water with paddles, and slowly drive the fish to swim to the big water surface.

Stocking time: it should be carried out in winter or early spring when the water temperature is 5 ~ 10℃. At this time, it is beneficial to the high-density transportation of fish species and can reduce casualties in transportation; The activity ability of fish species and fierce fish is weakened, and the harm of fierce fish to stocking fish species is relatively reduced.

Stocking location: It should be selected in the fertile bay upstream of the reservoir, with shallow water depth, shelter from the wind and abundant sunshine. In this way, staying away from the spillway and spillway tunnel downstream of the reservoir can reduce the escape opportunity of stocked fish, shorten the adaptation time to the large water surface environment, accelerate the growth and improve the survival rate.

3. Water quality management.

Water quality is the key to the success of raising bighead carp, so we should always pay attention to the change of water quality in the process of raising bighead carp. Transparency can be used as a standard for observing water quality.

The transparency of juvenile bighead carp should be controlled at 25-35cm, and that of juvenile bighead carp should be controlled at 35-45cm. If the bighead carp reaches 8- 10cm and the transparency is less than 30cm, black gill disease may occur within one week.

(1) The amount and time of changing water should be determined according to the water color, transparency, cleanliness of shell and gills of bighead carp and the pollution degree of bottom material.

(2) Salinity adjustment In places with abundant fresh water resources, in order to make bighead carp grow channel catfish quickly and comfortably, salinity should be adjusted according to different growth stages of bighead carp.

(3) Water quality improvers, such as calcium superphosphate, microbial agents, photosynthetic fungi, etc. It can also be used in conditional bighead carp farms to improve water quality, so as to adsorb or decompose organic matter at the bottom of the pond and reduce the harm of toxic gases such as ammonia.

4. Feeding methods.

Hello. Bighead carp must be fed mainly to get higher yield. Bait can be wheat bran and chaff, but the effect is not as good as that of special feed for bighead carp. The feed of bighead carp consists of cake, bran, fish meal and additives, which requires higher nutritional value than grass carp feed, and is similar to omnivorous fish such as carp and crucian carp. Generally made into powder, containing more than 30% crude protein. When the water temperature reaches 15℃ in spring, it is similar to taming other predatory fish, but it may take a little longer. When the water temperature is above 26℃ in summer and autumn, bighead carp grows rapidly, so it is necessary to strengthen feeding combined with water quality management. After successful feeding training, the feeding amount of bighead carp is generally 1%-3% of the body weight of pond fish, multiplied by 2-3 times. When feeding, bighead carp usually swims around the food field, with its head half exposed to the water, and the feed with water is swallowed into its mouth. The overall performance is not as intense as other predatory fish, but much milder, and the feeding coefficient is generally between 2 and 3. Some people use puffed granular floating feed to feed bighead carp. Although the feed quality is very good, the effect is not ideal. The growth of fish is uneven, the size varies greatly, and the feed coefficient is high, and the population yield is also average. Some people use snakeskin bags to pack sesame oil residue, plant oil residue, dried chicken manure and other powder feeds, and hang them in the sunny place in the pond. Generally, a bag is hung per mu, and when the bighead carp is hungry, it will touch the bag to eat. This method is especially suitable for those ponds with convenient sources and low prices, and has been used for reference by cage farmers and achieved good results.

5. Disease prevention and control.

The prevention and treatment of fish diseases adhere to the policy of "prevention first, combination of prevention and treatment". Fish diseases generally occur in "barley yellow, white dew heart", one is that the water temperature gradually rises, and the other is that the water temperature gradually drops. These two seasons are the high incidence seasons of fish diseases, which need to be prevented in advance. The method of killing insects first and then disinfecting is adopted for disease prevention. Diagnose fish diseases by visual inspection or microscope, and prescribe the right medicine.