After 1 and 15 were released, the survival rate and immune ability of young shrimp were improved (water and nutrition were supplemented regularly), and the survival rate at seedling stage depended not only on the quality of fry genes, but also on artificial management factors.
2. Generally, disinfected water should undergo a lot of toxin degradation before fertilization and algae culture to form beneficial microbial population advantages before fertilization and algae culture. At the seedling stage, it is particularly important to have vigorous algae phase and effective nutrients in the water body at the seedling stage because of frequent shelling.
3. For the first time, calcium enzyme fertilizer and amino acid algae paste were widely used to cultivate diatoms and algae. After 1~2 days of water coloring, high-calcium biological fertilizer+chemical fertilizer, sugar ammonia or fish and shrimp culture treasure are used in small amounts once every 3~4 days. This method is extremely important for the stability of algae phase.
4. On the day of seedling release, active calcium polycarboxylate+immune oligosaccharide is used and sprinkled every 3-5 days, which effectively enhances the vitality, internal and external stress resistance and bacteriostatic ability of shrimp. Using active shrimp larvae as open bait is moist, fat and tender, and the survival rate can be increased by more than 65,438+05%. The above management has been used for 30 days.