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水环境中不同Ca2+浓度对青海湖裸鲤(Gymnocypris przewalskii)幼鱼生存生长的影响

刘亚静1,2,么宗利1,来琦芳1*,周凯1,韩贻龙1,王慧1,高鹏程1,仲启铖1,郑亮1
  

  1. (1中国水产科学研究院东海水产研究所, 中国水产科学研究院盐碱水域渔业工程技术研究中心(上海), 上海 200090; 2上海海洋大学水产与生命学院, 上海 201306)
  • 出版日期:2016-08-10 发布日期:2016-08-10

Effects of Ca2+ concentration in water on the survival and growth of juvenile Gymnocypris przewalskii.

LIU Ya-jing1,2, YAO Zong-li1, LAI Qi-fang1*, ZHOU Kai1, HAN Yi-long1, WANG Hui1, GAO Peng-cheng1, ZHONG Qi-cheng1, ZHENG Liang1#br#   

  1. (1East China Sea Fisheries Research Institute, Engineering Research Center for Salinealkaline Water Fisheries, Chinese Academy of Fishery Sciences, Shanghai 200090, China; 2 College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China).
  • Online:2016-08-10 Published:2016-08-10

摘要: 作为典型的盐碱湖泊,青海湖水钙离子浓度仅为同盐度海水的1/10。本试验采用单因子静态急性毒性和室内生长试验方法,研究了不同Ca2+浓度对青海湖裸鲤(Gymnocypris przewalskii)幼鱼生存和生长的影响,以期了解适宜青海湖裸鲤幼鱼生长的钙离子浓度范围。结果表明:在Ca2+浓度为0~2431.10 mg·L-1(约为同盐度海水值的0~20倍)水体中,96 h内青海湖裸鲤幼鱼100%存活;在为期60 d的生长试验中,高Ca2+浓度组(1246.02±9.83) mg·L-1与低Ca2+浓度组(10.83±0.11) mg·L-1青海湖裸鲤幼鱼存活率均在95%以上,而体长、体重、体长绝对生长率、体重绝对生长率和特定生长率均显著低于对照组(120.65±1.62) mg·L-1 (P<0.05),各指标的排列顺序依次为:高Ca2+浓度组<低Ca2+浓度组<对照组,高Ca2+浓度组的特定生长率仅为对照组的54.62%。综上所述,青海湖裸鲤幼鱼可耐受的Ca2+范围较广,但过低或过高的Ca2+浓度均会导致青海湖裸鲤生长缓慢,且高Ca2+浓度抑制效果更为明显。

Abstract: Lake Qinghai, a typical salinealkaline water body, has a low calcium concentration, which is only 1/10 of the seawater with same salinity. The static acute toxicity test and laboratory growth experiment were conducted to explore the effect of Ca2+ concentrations on the survival and growth of juvenile Gymnocypris przewalskii. The results showed that 100% of the juveniles G. przewalskii survived in water of Ca2+ concentration from 0 to 2431.10 mg·L-1 in 96 h. In the 60 d growth experiment, juveniles G. przewalskii in both the high Ca2+ group (the concentration of Ca2+ was (1246.02±9.83) mg·L-1) and low Ca2+ group (10.83±0.11) mg·L-1 had a significantly lower body length, body weight, absolute growth rate of body length, and absolute growth rate and specific growth rate of body weight than the control group (with Ca2+ concentration of (120.65±1.62) mg·L-1, although their survival rates were higher than 95%. All the indicators measured were ranked as high Ca2+ group < low Ca2+ group < control group. The growth index was reduced more obviously in the high Ca2+ group and the specific growth rate was only 54.62% of that in the control group. In conclusion, G. przewalskii can survive in water with a wide range of Ca2+ concentration, but high or low Ca2+ concentration would lead to poor growth performance of G. przewalskii, especially in high Ca2+ concentration.