دانلود گزارش کارورزی و کار آموزی

چکیده : 

In order to evaluate the early tolerance of Mactra chinensis to salinity, the treatments of salinity gradients

and salinity gradual changes were set in this study, and the post growth and development of juveniles

were analyzed in recovery experiment, respectively. The result showed that the optimum hatching of

zygotes was found at a salinity from 24 to 32, which is narrower than that of larvae (20–32); a slight

of low salinity (16–32) will benefit the early growth and development of M. chinensis; at planktonic

and creeping stages, low salinity stress (20) was conducive to promoting the growth of juvenile M. chinensis

philippi; 4, 48 was the ultimate salinity of M. chinensis; The range of early tolerance of larvae M. chinensis

philippi to salinity can be widened through a short period of salinity acclimation.