One of the cultured varieties. I think we must pay attention to the following points when cultivating Penaeus vannamei: 1, pond cleaning and disinfection 1. 1, and pond cleaning.
When the bottom of the pond is exposed for more than 10 days, the mud or sandy bottom of the pond turns white, and finally the surface soil at the bottom of the pond is cleaned to remove residual bait, feces, animal and plant carcasses and pathogens. 1.2, disinfection
Disinfect 5 ~ 8kg/mu of bleaching powder 10 ~ 15 days before seedling release, and disinfect with 70 ~150kg/mu of quicklime the next day. 2. Water treatment
After feeding 0.5 ~ 0.6m water (filtered by 60 ~ 80 mesh double net), the basic bait is fertilized and cultivated. After 5 ~ 7 days, it can be disinfected again with 0. 1mg/L chlorine dioxide.
3. Fertile water breeds basic food organisms.
When the shrimp pond was flooded for the first time from 70cm (low temperature period) to ~ 100cm (high temperature period), urea L ~ 3kg/ mu and calcium superphosphate 1.5 ~ 2kg/ mu were used, and phosphate fertilizer was applied first and then nitrogen fertilizer was applied, depending on the water quality for 3 ~ 4 days after fertilization.
Under proper fertilization, the pond water is yellow-green or brown, with water transparency of 30 ~ 40 cm and pH value of 7.8 ~ 8.8. After testing the water with shrimp seedlings, you can consider releasing them. 4, seedling selection and seedling release
4. 1, seedling selection
Selecting healthy shrimp seedlings with uniform size and body length of 0.8 cm ~ 1.0 cm; The color of shrimp seedlings is transparent, the shrimp body does not change red, the gills are not black, and the appendages are clean and free of parasites; The two whips of the first antenna are close together, and the tail fan should
Fully open, long abdominal joints, flexible bouncing, strong water resistance, no damage, few spots on abdominal joints and strong eating ability. As can be seen from the breastplate, eating balls puts shrimp seedlings in a basin filled with water, rotates the basin water, and makes healthy shrimp seedlings swim against the current, so as to compare.
Bad shrimp seedlings are deposited in the center of the basin for a long time. Don't choose high-temperature seedlings above 32℃, shrimp seedlings with antibiotics, shrimp seedlings with low density (indicating that they are sick) and shrimp seedlings with many sediments and smelly bottom. Reecha Yu
Randomly take out a number of shrimp seedlings in the nursery pond, embed them with a wringed wet towel for 10 minute, and then put them back into the raw water after taking them out. If the shrimp seedlings survive, they are high-quality seedlings, otherwise they are inferior seedlings. 4.2, seedling release
Generally, 50,000 ~ 80,000 tails per mu are stocked in mud ponds with aerators (water depth 1.5m ~ 1.8m), and all of them are stocked at one time. Stocking time: around May every year, the water temperature is above 22℃. Should be based on their own breeding conditions and technology
The reasonable amount of seedlings should be determined according to the degree of operation, and the matters needing attention when releasing seedlings are as follows: 1. The pH and salinity of the pond water should be similar to that of the nursery pond; If the salinity difference is too large, the shrimp seedlings should be desalinated; Second, shrimp seedlings should be transported at night, and the seedling release time should be late.