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。
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-1in 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-1had 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.
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