1. Strict selection of broodstock must be strictly selected over the winter period. The selection criteria for broodstock should be large shrimp, healthy and disease-free, no deformity. The female body is 14 cm in length and the male body is 12 cm or more in length. Practice has proved that the survival rate or utilization rate of the broodstock of the low-density cultured large individuals is high. Soft molluscs that have just been molted can not be used as broodstock.
2. When sterilizing broodstock in the room and entering the pool, add 100-150×10-6 formalin or 20 g/m 3 of potassium permanganate for 1 hour at a water depth of 20 cm to 30 cm, and then gradually pour the pool water. Full.
3. Temperature regulation The facts prove that the temperature of unburnt coal will increase in winter, and the method of using deep well water directly into the pool will lead to the phenomenon that the prawn shrimp body is thin, the margin of the egg ribbon is fuzzy, spawning is dispersed and the hatching rate is extremely low. Therefore, when the prawn enters the pond, the temperature rises when the water temperature naturally drops to 8°C. The water temperature in winter is stable at 8°C～9°C, and the temperature difference between day and night is less than 1°C. When changing the water, note that the temperature difference can not be too large, you should warm up the seawater first. The best indoor heating, so that room temperature is slightly higher than the water temperature, the roof with straw and other Auxiliary Facilities to keep warm.
4. During the wintering season, bait should be treated with fresh and uncontaminated shellfish, squid, mixed fish, shrimp and silkworms. If you use frozen products, you must also use a certain amount of live bait. The food should be rinsed before feeding, or soaked with potassium permanganate. When feeding silkworms, they need to be soaked with fresh water for tens of minutes to kill parasites. Feeding frozen aquatic products should not be single and should be used in a variety of ways to complement each other. It is beneficial to the gonad development of broodstocks and increase spawning rate and hatching rate.
5. Water quality regulation During the winter, the indicator of water temperature control should be: salinity 23 to 35, ammonia nitrogen content 0.5 mg/l, dissolved oxygen 4 mg/l, chemical oxygen demand 3 mg/l or less, heavy metals and other pollutants Can not exceed the fishery water quality standards. Should change the water regularly, absorb the dirt and inflate. It is advisable to change the amount of water on the day from 20% to 30%.
6. Indoor lighting is generally less than 500 lux. Instead of shading with a roof grass shade, a black plastic film or black cloth is used above the cultivation pool to block it. Do not make the light too strong when changing the water, brushing the pool, feeding or other production operations, so as not to affect the normal winter broodstock.
7. Disease prevention drugs Drug abuse drugs will cause broodstock to overwinter in the “canister†until the spring flowering seedlings are used. When the shrimps are used, there are many dead shrimps, little or no spawning, and it is difficult to use. The correct prevention measures are: (1) The pool water should be soaked with 10g-20g/m3 bleach for 5 days to 7 days. (2) Sterilization of broodstock should be carried out regularly using antibiotics such as oxytetracycline. (3) Mixing methylene blue 0.05g to 0.1g/m3 and formaldehyde 25 to 30x10-6 once a week or every other week. (4) The bait is sterilized with potassium permanganate 200 g to 500 g/m 3 . (5) Pick out shrimp shrimp at any time to prevent cross-infection.
8. Grading on the basis of normal management, according to the development of gonads gonadal development selection grading, depending on the circumstances of the pool cultivation. By appropriately adjusting the water temperature of the gonadal development, promote its simultaneous development, so that the number of eggs and the time to concentrate accordingly, in order to facilitate the production arrangements, the daily temperature difference between the general warming or cooling is less than 1 °C.
Auxiliary Facilities
The greenhouse a filled with equipment like hydroponic, irrigation, auxiliary lighting ,temperature and humidity control and also may be automatically controlled by a computer to maximize potential growth.
Hydroponics can be used to make the most use of the interior space. The relatively closed environment of a greenhouse has its own unique management requirements, compared with outdoor production. Pests and diseases, and extremes of heat and humidity, have to be controlled, and irrigation is necessary to provide water. Most greenhouses use sprinklers or drip lines. Significant inputs of heat and light may be required, particularly with winter production of warm-weather vegetables.
Auxiliary Facilities,Greenhouse Ventilation Fan,Greenhouse Fogging System,Greenhouse Movable Irrigation
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