First, the feeding method
1, pond treatment
1 before pond impoundment 100-300 times diluted em bacteria liquid and insect-proof liquid made of em bacteria liquid instead of lime, etc. Disinfect and purify ponds.
2. Purification of water
3- 10 days before stocking, spray the water surface with em bacterial liquid diluent. Depending on the water quality, 15 days 1 time, 1 month 1 time. In places with poor water quality, the sprinkling time should be shortened appropriately. In order to spray evenly, the stock solution of bacterial liquid should be diluted before use.
3. Treatment of shrimp feed
Because the shrimp feed is granular, the bait can be sprayed with 200 times of em bacterial liquid diluent, and the bait can be sprayed to a wet degree to avoid scattering.
4, organic fertilizer and manure treatment
Organic fertilizer and manure to be put into water should be treated with em bacteria solution after fermentation and before being put into water.
Second, the breeding conditions
1, water source
Equipped with deep wells, groundwater is regularly replenished during the breeding process, which is safe and rich in mineral elements. Deep well water plays an important role in alleviating nitrite toxicity in the middle and late stage; Try to avoid adding external river water in the process of breeding, especially in the stage of frequent use of pesticides by surrounding crops.
2. Reservoir
Conditional farmers can take out 10-20% of the area as a reservoir, on the one hand, they can store foreign river water with good water quality, on the other hand, they can pretreat groundwater with substandard water quality.
3. Aerobic facilities
0.75kw/ mu bottom aerator and 1.5kw/ mu waterwheel can improve the utilization rate of waterwheel aerator (inclined), fully stir the water body for water transfer and aeration, and reduce the pollution of organic matter to the feeding area.
4. Heating equipment
The seedlings are released early in the greenhouse (in mid-February), and the phenomenon of late spring cold will appear after the seedlings are released. It is recommended to equip the boiler. Compared with heating rods, the boiler has the advantages of uniform heating, no influence of voltage, large heated water body and better thermal insulation performance.
If the temperature of the nursery pond can't be guaranteed, the shrimp colony will not grow well even if it is not affected, so even if the seedlings are released early, it may not be listed early. At present, there is an increasingly early trend of releasing seedlings in greenhouse in early season, so it is more important to equip boilers.
5. Miao Chi specifications (shed in shed)
The nursery pond in the greenhouse belongs to the shed-in-shed, and the temperature is superior to that of the big pond. It is suggested that expanding the area of nursery pond in shed and prolonging the temporary rearing time in shed can effectively improve the specifications of the pond and seize the market early.
Matters needing attention in shrimp culture
1. Generally speaking, the suitable water depth for shrimp culture is 0.9- 1.5 m, the suitable ph value for shrimp growth is 7.7-8.8, the suitable water hardness for shrimp culture is above 250mg/L, and the suitable total alkalinity is above 80. If it is lower than 80 or higher than 400, certain protective measures should be taken.
2. In the process of raising shrimp, it will surface for food. If the water body is too deep, it is not conducive to shrimp feeding and shrimp growth. Therefore, in the process of raising shrimp, we must control the water quality and water level, which must be conducive to the growth of shrimp.
3. In shrimp culture, the quality of fertilizer water is generally measured by the color, transparency and freshness of pond water. Fertilizer and water are also affected by environmental factors and nutritional factors. If the fat water becomes particularly poor, corresponding measures must be taken to protect it.