Culture techniques of freshwater shrimp

Culture techniques of freshwater shrimp

The suitable area of the shrimp pond is 1000-5000 square meters; 20-30 days before stocking, the shrimp fry are drained and disinfected thoroughly with 75 kg of quicklime, bleaching powder, bleaching essence and other drugs per mu; the water temperature is stabilized above 20 ℃ and the shrimp fry with a specification of more than 1.5cm and a survival rate of 75% are put in place; artificial pellet feed with a crude protein content of 3540% is mainly fed. Keep the pool water "fat, alive, tender and cool" with a transparency of 30 cm and a PH of 7 cm.

1. Pond preparation

The area of shrimp pond should be 1000-5000 square meters, the effective depth is 1.5-2.0 meters, the bottom of the pond is flat, the water quality is fresh, the drainage and irrigation is convenient, the water retention is good, the surrounding slope is large, and the construction of escape prevention facilities should be done well at the same time.

2. Clear the pond for disinfection

Drain the pond water 20-30 days before stocking, remove too much silt, renovate the pool ridge, use 75 kilograms of quicklime per mu or bleach powder, bleach essence and other drugs, thoroughly clear the pool for disinfection.

3. Aquatic plant cultivation

After disinfection of the pond, plants such as asparagus, water peanut, bitter grass and other plants are planted on the 70 cm water level line on the slope of the pond around the pond to form a grass belt, which is about 1 meter wide and 0.2 meters apart, accounting for about 15% of the total area of the pond.

4. Seedling stocking

Shrimp fry can be released when the water temperature of the shrimp pond is stable above 20 ℃. It is best to breed the young shrimp with a specification of more than 1.5cm and a survival rate of more than 75% after intermediate cultivation in a greenhouse or greenhouse, with a stocking capacity of 2-25000 pieces per mu.

5. Bait feeding

The diet of Macrobrachium rosenbergii is omnivorous and animal, so the diet should be mainly fed with artificial pellet feed with a crude protein content of 35-40%, and properly fed with live bait such as partially chopped small miscellaneous fish, snail meat, clam meat and so on.

6. Water quality management

Shrimp ponds should pay attention to water quality management, so that the pond water to maintain a "fat, live, tender, cool" transparency of 30 cm, PH value of 7 cm, dissolved oxygen of not less than 1 mg / L, if the water quality is sour, can be regularly sprinkled with quicklime to adjust.

7. Daily management

Insist on patrolling the pond in the morning and evening, observe the eating, molting and growth of shrimp, pay attention to the changes of water quality and water temperature, fish out the residual bait and sundries in the water in time, make a good record of pond patrol, and deal with the disease in time.

8. Timely fishing

When Macrobrachium rosenbergii is raised to September, most Macrobrachium rosenbergii can be caught and listed in batches when they are raised to September. In order not to damage the shrimp, a net of 30cm and 32cm can be used to catch large and small prawns, generally yielding more than 200kg per mu.