摘要
本文研究了海水环境中锌对中国对虾卵子孵化和无节幼体变态的影响。结果表明，可溶性锌对卵子孵化和无节幼体变态的作用只与游离离子活度有关，而不是与其总浓度有关。锌离子活度在１０￣（－７．３０）ｍｏｌ／Ｌ以下时，不影响卵子的孵化率；高于此浓度会显著（Ｐ＜０．０５）降低孵化率；在１０￣（－５．００）ｍｏｌ／Ｌ时卵子完全不能孵化。锌离子活度在１０￣（－７．６０）ｍｏｌ／Ｌ时，不影响无节幼体的生长变态；高于此浓度时，明显（Ｐ＜０．０５）减少变态率；高于１０￣（－６．００）ｍｏｌ／Ｌ时。无节幼体完全不能存活。讨论了锌离子对对虾育苗系统的影响，认为育苗过程中锌离子的最佳活度为１０￣（－７．６０）ｍｏｌ／Ｌ。
The effects of zinc in seawater on egg hatching and nauplius metamorpho-sis of Penaeus chinensis were studied. The results indicated that actions of dissolved zinc on egg hatching and nauplius metamorphosis are only relative to free zinc ion activity,not to total concentration of dissolved zinc. The egg hatching was not affected bv zinc atactivities of 0-10￣(-7.30)mol/L,and was significantly(P<0.05)decreased of activities higherthan 10￣(-7.30)mol/L;no egg could hatch zinc at activity of 10￣(-5.00)mol/L. The naupliusmetamorphosis was not affected by zinc at activities lower than 10￣(-7.60)mol/L,and wassignificantly(P<0.05)decreased at activities higher than 10￣(-7.60)mol/L; no nauplii couldlive at zinc ion activity of 106￣6.00mol/L. The effects of zinc ion on the svstem ofseedling-rearing of P. chinensis were discussed and it is believed the optimum zinc ion ac-tivity in the system of seedling-rearing of P. chinensis is 10￣(-7.60)mol/L.
出处
《中国水产科学》
CSCD
1995年第3期1-7,共7页
Journal of Fishery Sciences of China
关键词
锌
离子活度
卵子孵化
无节幼体
中国对虾
Zinc
Ion activity
Egg hatching
Nauplius
Metamorphosis
Penaeus chinensis
