Technique of culturing green shrimp in two seasons in one pond

Double-season green shrimp culture is a production technology of raising two crops of green shrimp a year according to the growth law of green shrimp and making full use of water surface resources. The average yield of the former green shrimp was 40 kg per 0.067 ha, and the average yield of the latter was more than 50 kg, thus achieving higher economic benefits.

(a) Pond preparation Pond covers an area of 0.33 muri 0.8 ha and a water depth of 1.0 muri 1.2 m, either sandy soil or loam. The slope ratio of the pond is 1 to 1, and the pond is impervious to water, and the silt at the bottom of the pond is controlled at about 30 cm. The inlet and drainage system is matched, an anti-escape net is placed at the inlet and drain, and attachments are set up for the hidden habitat of green shrimp, and the shrimp carrying capacity in the pond can also be increased. Generally choose tea trees, pine branches and other artificial attachments, can also be planted in the early stage of aquatic plants, in conjunction with the use of tea trees, pine branches and so on.

(2) the supporting equipment is generally equipped with one pump for every 1.33 hectares of pond, one aerator and one pump for every 0.67 hectares of high-yield intensive ponds, and one self-made pellet feed machine for each household.

(3) stocking

(1) Culture of green shrimp in the previous crop: the stocking time was from January to February, mainly stocking young shrimp in the pond, with a specification of 500mm / kg, with an average of about 1 kg per 0.067 hectares.

(2) follow-up green shrimp culture: from June to July, the main stocking time is from June to July, and the fry of the same year is mainly stocked, with a specification of 1.5m / m 2.0cm, with an average of 30000 larvae per 0.067 ha, and 500 mixed species of silver carp and summer fish.

(4) feeding and management

(1) feeding: the kinds of feed can be selected according to local conditions, such as vegetable cake, bean cake, special material for green shrimp, self-made pellet feeding, snail clam meat, miscellaneous fish and so on. Generally, concentrate is given priority to, supplemented by animal feed. Daily feed is usually controlled at 3% Murray 10% of shrimp body weight. There are usually two daily throws, including 1max 3 of the daily investment at 7am-8am and 2max 3 at 5pm-6pm. The method of scattered sprinkling is used when feeding, which is mainly placed around the pond and on the attachments to facilitate the uniform feeding of green shrimp.

(2) fertilization: in the process of culture, always keep the water quality "fat, alive, tender and cool" to ensure good water quality and adequate natural feed in shrimp ponds. In the early stage of culture, the method of direct fertilization was adopted. According to the situation of water quality, organic fertilizer was applied every 0.067 hectares every week. In the middle and later stages of culture, organic manure fermented by rotten heat was used. Depending on the situation of water quality, 100ml 200kg (with water) was applied every 0.067 hectares every half month.

(3) Water quality management: the transparency is controlled at about 25 cm in the early stage of culture (3muri-May), 25 cm in the middle stage of culture (6-July) and 30 cm in the later stage of culture (8-October). If the culture conditions are better, the power is more than 0.067 kilowatts per 0.067 ha, then the transparency in the culture process can always be controlled at 10 Murray 20 cm. The spread of aquatic plants should be controlled, especially floating plants and floating plants should be completely removed, and floating plants should be strictly controlled. Change water to achieve "small in and small out" to prevent nutrient loss.

(5) the cultivation of green shrimp before fishing is put on the market, generally starting rotation fishing at the end of April and concentrated fishing by the end of June. After the green shrimp culture, generally in October to start rotation, to the Spring Festival before and after the centralized fishing.