摘要
研究了盐度对奥尼罗非鱼受精卵孵化和仔鱼活力的影响。在不同盐度（2、5、8、11、14、17、20、23）及纯净淡水（0），水温（29±0．5）℃下，比较观察奥尼罗非鱼受精卵的孵化时间、孵化周期、孵化率和畸形率。同时在不同盐度条件下对初孵的奥尼罗非鱼仔鱼进行耐饥饿试验，测定其不投饵存活系数（SAD。结果表明，盐度5～14时，奥尼罗非鱼仔鱼受精卵孵化率较高（88．7％～90％），盐度高于17和低于2时，孵化率较低。盐度在2～5及14～17可分别视为奥尼罗非鱼受精卵孵化的两个临界区域。仔鱼生存适宜盐度5～14，最适盐度5～8。盐度为11和14时，SAI值分别为19．05和20．84。此时仔鱼发育缓慢，部分仔鱼的身体一直未出现色素。盐度高于17和低于2时不适合仔鱼的培育。仔鱼的SAI值与受精卵的孵化率呈正相关关系。
Influences of salinity on hatching rate and larval vitality in hybrid tilapia （Oreochromis niloticus × O. aureus） were investigated in the study. The hatching time, incubation period,hatching rate and deformity rate of the embryos and survival activity index （SAD of newly hatched larvae were observed at salinities of 2,5,8,11,14,17,20,23 and freshwater at water temperature of （29±0.5） ℃. The normal embryonic development and high hatching rate （88.7 %-90%） were observed at salinities from 5 to 14 while low hatching rate was occurred at a salinity of both less than 2 and more than 17. The salinities both from 2 to 5 and from 14 to 17 were found to be two critical ranges, leading to significant differences in hatching rates. The result showed that the suitable salinity ranged from 5 to 14 for the survival of larval hybrid tilapias,with the optimum survival salinity 5-8. The larvae had slow embryonic development and pigmentation and SAI values of 19.05 and 20.84 at salinity 11 and 14. The larvae were reared unsuitably at a salinity below 2 or over 17. The SAI of larvae had a positive relationship with tilapia hybrid as positive related to the hatching rates of fertilized eggs.
出处
《水产科学》
CAS
北大核心
2009年第6期329-332,共4页
Fisheries Science
基金
广东省科技计划项目(2006B202230017)
关键词
奥尼罗非鱼
受精卵
盐度
发育
存活系数
hybrid tilapia（Oreochromis niloticus ×O. aureus）
fertilized egg
salinity
development
survival activity index （SAI）
