盐度变化对人工培育的中国对虾仔虾成活率及生长率的影响

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

研究了中国对虾 (P chinensis)成活率及生长率与盐度变化关系 .盐度偏高 (大于35‰ )时 ,对中国对虾生长不利 ,致使其生长缓慢 ,甚至死亡 .而盐偏低于 15‰时 ,可加速蜕皮 ,对其生长有促进作用 .但盐度突变会导致大批死亡 .结果表明 ,其适宜盐度为 15‰～30‰ .在此范围内 ,虾存活率和生长率较高 .

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