1, broodstock selection

The broodstock can be selected from September to October in the previous year or from March to March in the same year. It requires a weight of 30-50g, complete appendages, health and disease-free, strong activity, male to female ratio of 2-3:1. Male and female lobsters have obvious features in appearance and are easy to distinguish.

A mature lobster, the male individual is significantly larger than the female;

2 The male dragons have large feet, and there are bright red soft ticks on both sides of the dragon feet. The female dragon feet are relatively small. There are no red soft ticks on most female feet.

3 The male gonopore opening was at the base of the 5th paired foot, while the female genital opening was at the 3rd paired foot.

4 Sexually mature females have enlarged abdomen and relatively narrow male abdomen.

2, broodstock cultivation

The broodstock pool area is suitable for about 1200m2, the bottom soil is made of loam, the water depth is about 1m, the pool width is more than 1.5m, there is ample and good water source, and the injection and drainage holes are built. The board is built to prevent escape, and the ponds are sterilized with 50-60kg/kg of lime dry ponds for 7-10 days before stocking. After the disinfection, the water is filtered by the filter (the wild fish is prevented from entering the pond) and the water depth is about 1m, and the decomposed livestock and poultry manure is used to fertilize water of 500-800kg/mu. In the pool, people are provided with concealed objects such as branches, roots, bamboo tubes, etc., and some plants are transplanted.

The broodstock pool can be used to feed broodstock 40-60kg/mu, and 3% salt water is used for bathing for 10 minutes before stocking to kill pathogens. In order to make full use of the water body and regulate the water quality, 50-100 tails per mu can be mixed. During the cultivation period, fresh water grass, bean cake, wheat bran or compound feed can be fed and a part of animal feed can be added. Such as chopped snail meat, livestock slaughtered leftovers and so on. Daily feeding amount: In March, it is 2%-3% of broiler weight, 4%-5% in April, 6%-8% after May, and 1 feeding each morning and evening, mainly in the evening. It accounts for 70% of the amount of bait. At the same time strengthen water quality management, change fresh water once every 10-15 days, change water 1/3 each time; use lime every day for 10-25g/m2 dipping water once to maintain good water quality, promote gonad development .

3, broodstock breeding

In April-May, when the water temperature is above 20, broodstock begin to mate. Fertilized eggs hatch into juvenile shrimp in the female's abdomen, and incubation takes 40 to 70 days. After juvenile hatching, the growth and development of juveniles are completed under maternal protection. When young shrimp leave the mother, they can take food and live independently. When a large number of juvenile shrimps are found in the breeding ponds, the seedlings should be harvested in time for the cultivation of shrimps.

4, winter broodstock

The lowest survival temperature of lobster is 5°C. However, when the water temperature is lower than 9°C, the mortality rate is high during the overwintering period for shrimps of about 3 cm in size, and although adult shrimps can survive, there are also many deaths after 2-3 months. Therefore, do a good job of wintering for broodstock and ensure that the water temperature during the winter is between 16°C and 18°C, which is also an important part of the breeding work.

The method of overwintering of broodstock is the same as that of Macrobrachium rosenbergii. Commonly used wintering methods include plastic film-covered pool insulation method, electric heater heating method, hot spring water overwinter method, factory residual hot water overwinter method and glass room overwinter method, etc. The safe wintering effect of broodstock.

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