How much land is needed for crayfish culture mainly depends on fry specifications, bottom conditions, water depth, water changing conditions, feeding methods, bait types, production skills and management level. Take the intensive shrimp pond as an example. If the quality of shrimp is good, the bait is guaranteed, the water exchange conditions are superior, and the management level of its own feeding is relatively high, generally about 20,000 seedlings are released per mu (no more than 25,000).

1. How many places can I raise lobsters?

The release density of crayfish depends on fry specifications, sediment conditions, water exchange conditions, feeding methods, production skills, shrimp pond area, pond water depth, bait types, management level, etc., and should be determined according to its own expected yield requirements and specifications. The number of released seedlings can be calculated with reference to the following formula:

1, number of seedlings = (planned seedling yield (kg)? It is required to develop mantissa 1kg)/ estimated survival rate. Among them: the planned yield per mu can refer to the output of neighboring areas over the years; 1 kg shrimp mantissa can be calculated as 30-50 (body length12-15cm); The survival rate is 50-70%, and the shrimp seedlings cultivated in the middle are 85%.

2. If it is an intensive shrimp pond, under the conditions of good shrimp seedling quality, guaranteed bait, superior water exchange conditions and high feeding management level, the amount of seedlings released is generally about 20,000 (no more than 25,000)/mu. The number of shrimp seedlings (about 2.5cm long) cultivated in the middle should be controlled at 8000- 12000 plants per mu.

Second, how to raise crayfish to grow fast and big

1, juvenile shrimp stage

(1) At this time, crayfish mainly feed on some small aquatic larvae, which can generally be fed with meat and vegetables, such as feeding a proper amount of rotifers and feeding some cladocera and copepods.

(2) A proper amount of fertilizer should also be added to the water body, accompanied by a certain amount of? Prawn? Ensure the nutrition of water body, provide comprehensive nutrition for young shrimp and make it grow rapidly.

Step 2: Adult shrimp stage

Crayfish (1) is an omnivore. The suitable water temperature for its growth is about 20-30℃, and the fastest growing period is usually August-65438+1October every year. During this period, we should feed some foods rich in protein, such as bran, bean cakes and other plant fertilizers with high protein content.

(2) Although the feeding cost of animal feed is high, we can also feed some animal feed in moderation and mix it in moderation. Prawn? This can not only prevent crayfish enteritis, but also cultivate water and fertilizer, strengthen crayfish physique and improve survival rate.

3. Slow growth period

(1) Generally, a large number of crayfish will be listed from May to June every year, so it is necessary to feed food reasonably in the slow-growing winter and spring season (which can reduce the feeding amount and avoid waste), and the management at this time will directly affect the quality of crayfish listed.

(2) In winter, animal feed is the main feed, supplemented by plant feed, which is also used? Prawn? Mix ingredients.