Greenhouse crayfish farming in the greenhouse is similar to greenhouse vegetable planting in greenhouses. They use eyesight as an energy source to maintain the temperature of the environment and water in the greenhouse and ensure the normal growth of crayfish.
Breeding and reconstruction of breeding ponds Taking into account the stability and convenience of the greenhouse facilities, the breeding pond mouth is as much as possible groove-shaped rectangular. The newly excavated Tangkou can be excavated according to a ditch-shaped rectangle. The Laotangkou reconstruction can be built with slopes and slopes to create conditions conducive to setting up greenhouses. The specifications and requirements of Tangkou are: width (ie, span) 5 to 8 meters, length 30 to 50 meters, depth 50 to 70 cm, and pool slope ratio 1:1.2 to 1.5. If conditional, fix 1 to 2 microporous oxygen tubes in the pond for oxygenation. Tongkou construction and transformation of clear pond fertilization,
Filter water, transplant or stock water hyacinth, water peanuts, Elodea and other aquatic plants.
The greenhouse facility first prepares bamboo or bamboo pieces, and cuts the stings on bamboo or bamboo pieces, and buries the bamboo or bamboo pieces at equal distances along the sides of the tang. The spacing between bamboo and bamboo is generally 1.5 to 2.5 meters. Material strength may be determined. In Tangkou, both sides of bamboo or bamboo are bent relative to each other and taped to form an arch. The arched bamboo or bamboo is placed on a cross beam and secured with tape. The density of the beam depends on the strength of the arch. In the middle of Tongkou, piling bamboo wool across the board to the two ends of the pond, to facilitate bait and fishing in the shed, the pile can be 10 cm above the water surface. Finally, plastic film was placed on the scaffold. Generally, two layers of plastic film are laid in order to ensure the insulation effect. After the two ends of Tangkou are surrounded with plastic film, a small door is left for the convenience of the managers. Tangkou equipped with microporous aeration pipelines can be oxygenated at any time by installing an air pump and an aeration tube near the power grid. Greenhouse frame materials can also be made of cheap, hard materials made by manufacturers, and farmers can choose from them.
There are two types of stocking for raising seedlings in the freshwater crayfish greenhouse. One is the stocking of shrimp seedlings, and the time for laying seedlings in the lower reaches of the Yangtze River is generally around the beginning of October. One is the holding of freshwater crayfish for commercial use. The stocking time is generally around the end of November, and the holding period is decided according to market conditions. Seed stocking density: specifications for the 60 ~ 100 / kg of seed laying 25 kg per acre; specifications for the 30 ~ 50 / kg of about 50 kg per acre. Restocking methods: shrimps and crabs disinfectants or 3% to 5% of seed to be released
Disinfect the salt water and distribute it evenly on the poolside plants.
Feeding management of freshwater crayfish greenhouses depending on the temperature of the water body, the water temperature in the range of 20 ~ 25 °C, can be fed before and after noon every day, feeding rate of 3% to 4%; water temperature 15 ~ 20 °C, It can be fed once a day for two days, and feeding time is also higher at noon. In addition to the management of normal season farming, management should also pay attention to: First, the amount of dissolved oxygen in the water body. Oxygen-containing microporous, to turn on oxygen at a timely start, there is no mechanical oxygen increase device, when the water body is deficient in oxygen, it is necessary to use chemical oxygenation agent in time. Usually at noon during the day, the two small doors in the greenhouse are opened for ventilation, and there is also an effect on oxygen in the shed. The second is the temperature inside the greenhouse. Especially when there is no light at night, a straw curtain can be covered on the shed to ensure the temperature inside the shed. The third is to pay attention to changes in water quality, and conditional use of microbial preparations to maintain water quality.
Fishing will reach the market specifications of freshwater crayfish timely catching and selling with shrimp cages, reducing the density of freshwater crayfish and increasing the growth space of shrimp.
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