The Effects of Salinity Change on the Survival and Growth Rate of Artificial Reared Postlarvae of P.chinensis

P chinensis is extensively salty and adapts the salinity change of coastal water areas environment caused by climate and by hydrography Salinity change has a direct effect on the shrimps osmotic pressure and also affects the biological quantity and species,causing the change of water condition and other factors indirectly Generally spearing,P orientalis can survive the salinity ranged from 3 0‰～40 0‰ The survival and growth change If the salinity incllines to the high side(35 0‰),it will have a negative effect on the growth and cause the growth slowly In contract,the salinity is low(15 0‰),it will stimulate edycisis and have an action to increase the growth However,the salinity is too low to get rise to the diseases of the shrimps By designing the salinity grads,the experiment studies the suitable salinity of P chinensis The results show that the suitable growth salinity is 15 0‰～30 0‰ In this scope,the survival and growth rate is high