Keeping freshwater prawn through the east

Appropriate temperature for giant freshwater shrimp to grow and develop from 22 to 23 ⁰ C, most suitable is 28 - 31 ⁰ C. Temperature limit is 14 - 40 ⁰ C, season for raising giant freshwater shrimp in the North is preferred consolidation is from April to November (solar calendar). Winter in the north of our country usually lasts 4 - 5 months, low temperatures not only have a big impact on cold-tolerant fishes (tilapia, white pomfret) but also affect the existence and growth and development of giant freshwater prawn.

(Photo: VNN) In recent years, the air temperature down below 100C has caused great damage to broodstock sources as well as commercial shrimp production, affecting the production plan next year.

In order to keep the giant freshwater shrimp over the east, a number of production establishments in the North have invested heavily in winter construction to serve giant freshwater shrimp.

1. Raising giant freshwater prawns through the pond

Use a pond from 2 - 3m deep, where the wind is hidden, on the pond surface, drop the water hyacinth with the area occupying 1/2 - 1/3 of the pond water or in the pond with many stumps, the bundles for shrimps shelter. There are a number of places that have used non-kitchen containers with honeycomb coal to drop into the water so that the heat emitted from the kitchen heats the water, creating a suitable temperature for shrimp. In the process of raising shrimps through the east, it is necessary to use industrial food, feed shrimp on warm sunny days, diets make up 1-2% of the volume of farmed shrimp. In this way, shrimp can reach a survival rate of 50% - 60%.

2. Breeding shrimp over the east in cages

Stocking shrimp cage in 2 -3m deep water reservoirs, shrimp density from 100-200 fish / m3 inundated. Shrimp fed with industrial feed content reached 30%, diets accounted for 2-3%, shrimp volume. In this way, the growth rate of shrimp is slow but the survival rate is high, reaching 70-80%.

3. Farming shrimps in warm mineral waters

Some places like Kim Boi (Hoa Binh), Tien Lang (Hai Phong), Tien Hai (Thai Binh), Bac Quang (Ha Giang), Son La and Bac Can . can use warm mineral water to raise shrimps. across the east. Farming in ponds or tanks, but the water source must be clean, no pollution, environmental factors must ensure pH = 6-8, dissolved oxygen> 3mg / l, hardness 20mg / l, iron 0.2mg / l. In this way, the rate of live shrimp reaches 90 - 95%.

4. Raising shrimp over winter in warm houses

It is possible to build shrimp tanks in a sheltered, sheltered, well-lit indoor and with a coal-fired boiler or set a temperature lift to adjust the temperature. However, raising in this way must monitor the temperature and the level of cost often.

Raising freshwater prawn through the east, however, it must be placed in a pond or an aerator in the pond or tank to provide oxygen for the shrimp. In recent years, artificial reproduction of giant freshwater prawn has grown extensively in the northern provinces, so it is necessary to care for shrimp farming in the east to be able to actively supply shrimp seed to farmers.