How to raise bare-lipped fish (grouper)? What are the technical specifications for pond culture?

Grouper, also known as smooth-lipped fish, is an important economic species in coastal culture in the South China Sea, so can grouper be cultured in fresh water? How do you raise it? What are the technical specifications for pond culture?

I. Seedling cultivation techniques

1, fry requirements: freshwater grouper fry culture pond to soil pond is better, you can also use outdoor cement pond, generally single pond area is 50100m3, water depth 1 (5 meters). Before releasing the fry, drain the pond water, thoroughly clean the pond with quicklime, and apply sufficient basic fertilizer to improve the water quality, so that the fry can eat natural bait in the pond.

2. Fish fry restocking: fish fry should be tested before restocking. The specification of stocking in the same pool is neat and the size is the same. Stocking density depends on bait, breeding technical level and cultivation specifications, generally stocking density is 100 tails, m ~ 3. The fish fry should be soaked in sop's salt water for 15 minutes for 20 minutes before entering the pond.

3. Feeding: when freshwater grouper larvae go down to the pond, they feed on zooplankton. With the growth of fish fry, the food intake increases, while the zooplankton in the pond decreases gradually. At this time, zooplankton can be cultivated by topdressing, and soybean milk can be fed on the other. After 15 minutes of cultivation for 20 days, when the fry reached more than 3 cm, its feeding habits began to change, and the surimi could be fed on the table for domestication.

Days later, add a small amount of artificial formula feed mixed with surimi, and then gradually increase the proportion of artificial formula feed and reduce the amount of surimi until all artificial formula feed is used. The daily feeding amount is about 20% of the body weight of the fish, and the bait is given 3 times a day.

4. Cultivation and management:

(1) regulating water quality: in the process of fish fry cultivation, the residual manure bait is the most likely to spoil the water quality due to fertilization and feeding, so the water should be changed every 5 days, and the amount of water each time is 1 ~ 4 of that of the pond water. Some aquatic plants such as duckweed or water hyacinth can also be transplanted in the pond to purify the water quality and facilitate the concealment and feeding of fish fry.

(2) timely separate culture: when the growth specifications of fish fry are quite different, because they have the habit of eating big and small, they should be screened and raised in time. The specifications of fish fry in the same pond should be consistent so as not to affect the survival rate of fish fry.

(3) Daily management: mainly patrol the pond and observe the eating, activity and water color changes of fish fry, so as to adjust the feeding amount in time and do a good job in preventing fish diseases.

2. Adult fish culture techniques:

The cultivation of freshwater grouper can be mixed culture, and two methods can be used in mixed culture.

The main results are as follows: 1. A small amount of freshwater grouper is mixed in the pond, and there are about 22 per mu of freshwater grouper. After half a year, the average body weight can reach more than 300 grams, and after one year, the body weight can reach about 500 grams.

2. The main fish culture is freshwater grouper, mixed culture species include tilapia, grass carp, crucian carp and so on. 150200 freshwater grouper and 300 mixed fish are raised on each mu of water surface. Artificial compound feed and fresh and tender forage can also be fed during the feeding period. When there are not enough zooplankton in the pond, appropriate amount of topdressing is needed to cultivate zooplankton. After half a year of culture, the average weight of freshwater grouper can reach about 200 grams, after a year of culture, the body weight can reach more than 250 grams.