Taking the specialized culture technology of pond bass as an example, the culture method is as follows: 1. Before stocking fish, 75- 100 kg of quicklime slurry is used in each mu of pond, and then organic fertilizer 150-250 kg of fertilizer water is used. 2. In the middle and late April of each year, summer flower fingerlings are stocked, and the stocking density is 1000- 1500/ mu. 3. At the initial stage of feeding, the daily feeding amount of bait is about 8- 10% of the body weight of perch. With the growth of the bass, the daily feeding amount is adjusted to about 3-5% of the bass weight. 4, timely oxygenation, ensure the dissolved oxygen in more than 5 mg/L. ..

First, the culture method of perch

1, special culture technology of bass in pond

(1) pond treatment

① The pond requires no leakage, less silt at the bottom, sufficient water, fresh water and high dissolved oxygen.

② The suitable breeding area is 2-3 mu, and the water level is about 1.5-2m.

(3) Before stocking fish, 75- 100kg of quicklime slurry should be used for each mu of pond, and the pond should be cleaned and disinfected.

④ After cleaning the pond, apply organic fertilizer 150-250kg per mu of pond to fertilize water, accelerate plankton reproduction, and provide natural bait for stocked fish.

(2) stocking

(1) California perch is generally stocked in the middle and late April of each year when the water temperature reaches 18℃.

(2) Summer flowering fingerlings should be propagated in the same year, with a body length of about 4-5cm, and the specification gap between fingerlings should not be too large, otherwise the situation of big fish eat small fish will easily occur.

(3) Under normal circumstances, 65,438+0,000-65,438+0,500 perch fry are stocked in each mu of pond, and appropriate amount of carp, silver carp, bighead carp, crucian carp and tilapia are added (which is helpful to improve and stabilize the water quality). If the feed is sufficient and the water quality of the pond is good, the stocking density can be appropriately increased.

(3) Feeding

① California bass can be fed with animal baits such as mussels, snails, earthworms, loaches, small fish, shrimps, fresh internal organs of domestic animals and artificial compound feed, but the protein content of artificial compound feed should be above 35%, and it needs to be processed into dough sticky feed when feeding.

(2) At the initial stage of feeding, domestic fry such as silver carp and carp, as well as baits such as fish paste, earthworm and red worm were selected, and the daily feeding amount was about 8- 10% of the body weight of the perch, and it was fed three times a day, that is, in the morning, at noon and at night.

(3) With the continuous growth of perch, it is necessary to increase the feeding amount and gradually switch to artificial compound feed or fresh animal feed (such as miscellaneous fish, snail meat, livestock offal, etc.). ). The daily feeding amount is about 3-5% of the bass weight, and it is fed twice a day, from 8: 30 am to 9: 00 am and from 4: 00 pm to 5: 00 pm respectively.

④ There are mainly the following kinds of artificial compound feed: 1. Eel feed. Secondly, after grinding the miscellaneous fish into pulp, mix it with proper amount of peanut bran and corn flour. The third is a mixed feed consisting of 60% fish meal, 40% No.4 powder and 40% yeast powder.

⑤ Adjust the feeding amount every 7 days or 15 days according to the eating situation and weather conditions of perch.

(4) management

① Due to the high stocking density, it is necessary to patrol the pond regularly to observe whether there is lack of oxygen in the breeding process. If yes, start the aerator to aerate in time to ensure that the dissolved oxygen in the water is above 5 mg/L.

② After feeding for 2 months, feeding in different ponds can effectively improve the survival rate and yield of perch.

(3) The transparency of water body is kept at about 20-30cm.

(4) The water inlet and outlet of the pond need to be fortified with escape nets to prevent the bass from escaping.

2, cage culture bass technology

(1) Selection of aquaculture waters

Requirements for aquaculture waters: sheltered from the wind and facing the sun, with good lighting conditions, wide water surface, water level depth of not less than 2.5m, dissolved oxygen in water above 5mg/L, pollution-free water quality and quiet surrounding environment.

(2) Specification of cage

① The mesh size of the cage should be about 0.8- 1.2cm in case of bass fingerling culture, and about 2-3cm in case of adult fish culture. The area of the cage should be 8-20 square meters.

(2) The cage is frame-floating, and the netting is made of bricks, stones and other objects.

(3) The fence is made of bamboo, and the cages are arranged in zigzag. The spacing between two rows is about 1-2m, and the spacing between cages is about 0.6-1m..

(3) stocking

① Soak the cage in water 10- 15 days before stocking fish.

(2) Select fish species with intact appearance, strong physique and basically the same specifications for stocking.

(3) If summer flower fingerlings are stocked, 300-500 fingerlings are stocked per square meter. If the first-year-old fish are stocked, 15-20 fish are stocked per square meter.

(4) Feeding

(1) If it is a summer fish, the daily feeding amount is about 8- 10% of the body weight of the bass. If it is a one-year-old fish, the daily feeding amount is about 3-5% of the body weight of perch.

(2) If it is a summer flower fish, feed it three times a day, in the morning, at noon and at night. If it is an adult fish, feed it twice a day, from 8 am to 9 am and from 3 pm to 4 pm.

(5) management

① Check the bait residue in the cage in time, and adjust the daily feeding amount of perch accordingly.

② Remove the dead fish from the cage in time.

(3) check the damage of the cage, often clean up the debris attached to the cage.

④ Check the fluctuation of water level in aquaculture waters in time and adjust the cages in time.

⑤ When the bass is cultured to 400g/ tail, it will be caught and marketed.

⑥ If the perch does not meet the market specifications, it can continue to be raised, but the maximum specification of perch should be kept below 650g/tail.

2. How long is the bass culture cycle?

1. The culture cycle of perch is about 6 months.

2. In the process of culture, in order to avoid the occurrence of eat small fish, it is necessary to carry out graded culture. In the early stage of bass culture, it is usually screened and graded once every 7- 10 day. In the middle stage of culture, once every 10- 15 days, the perch was screened and graded with a 7-mesh sieve, and the perch was transferred to the cage No.6 for culture. From the end of June to the beginning of July, the bass was screened and graded once with a 9-mesh sieve, and then transferred to cage No.8 for culture for about 15 days. Finally, the perch was screened and graded once with a 1.3 inch sieve, and put into a 10 cage for adult fish culture.