This paper introduces the technical points of shrimp culture in greenhouse, and also talks about the water temperature of shrimp culture in greenhouse for reference.
First, the advantages of cultivating prawns in greenhouses
1, the temperature is well controlled, the temperature rises quickly, the temperature drops slowly, the seedlings can be released in advance or the shrimps can be released later, the temperature change is much smaller than the outside, and the stress is reduced.
2, the use of groundwater, relatively clean and pollution-free, reducing cross-infection of diseases.
The groundwater temperature is stable, and the water temperature will be appropriately raised at low temperature, and the warm water will be appropriately lowered at high temperature to achieve the purpose of adjusting the temperature.
3. The feeding and growth rate of prawns are well controlled; The water quality is better regulated; The cost of medication is not high.
4, anti-season sales advantage, can be listed at the earliest and at the latest, with high price and good economic benefits.
Second, the water temperature requirements for shrimp culture in greenhouse
The optimum growth temperature of prawn is 25℃-32℃.
1 g juvenile shrimp grows fastest at 30℃, and 12- 18 g prawn grows fastest at 27℃.
When the water temperature is below 15℃, Penaeus vannamei will reduce or stop feeding. When the water temperature is below 9℃, Penaeus vannamei will lie on its side or die, and the lowest temperature for culture should be above 18℃.
In addition, when the water temperature is above 35℃, the feeding and growth of Penaeus vannamei are greatly affected.
III. Technical Points of Shrimp Cultivation in Greenhouse
1, clean the pond with lime or bleaching powder, enter the water after 1, and apply organic fertilizer and biological agents to make the pond water stable yellow-green or brown.
2. Seedlings can be released around April when the outside air temperature reaches above 20℃ and the water temperature in the shed is basically kept at around 20℃.
3. Choose shrimps with complete appendages, clean body surface, slender body segments, close tentacles, full tail fan, straight and full gastrointestinal tract, strong heart contraction and strong anti-water ability, and the size is about 1 cm.
4. Generally, the bigger the prawns are, the more they are fed. Try to feed more at night and less during the day. When there are many residual baits in the bait table and the water quality or weather is bad, you should feed less.
5. Water quality management is the key to shrimp culture. The quality of water directly affects the survival of shrimp, and good water quality can reduce the risk of shrimp disease.
Keep the transparency of water at 30-40cm, and the change of water should not exceed 10% of the pool water, so as to keep the water quality clean.