(一)养殖前期死亡的主要原因及预防措施1.养殖前期死亡原因。(1)苗种质量差:由于在育苗过程中操作不当,大量使用抗生素,或因亲虾的问题等,使培育出来的虾苗质量太差,放养后就会大量死亡。(2)淡化不彻底:由于淡化不彻底,育苗池盐度高于养殖池盐度,使得放养后因不适应而死亡。 (A) the main reason for pre-breeding mortality and preventive measures 1. Pre-breeding causes of death. (1) poor seed quality: due to improper operation in the nursery process, extensive use of antibiotics, or because of the problems of broodstock, so that the quality of shrimp cultivation is too poor, a large number of deaths after stocking. (2) The desalination is not complete: As desalination is not complete, the salinity of the nursery pond is higher than the salinity of the aquaculture pond, which causes the death after being stocked due to the incompatibility.