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Effects of different K+ and Ca2+ concentrations in water environment on the survival rate, oxygen consumption rate, and suffocation point of juvenile Barbus capito.

HAN Yi-long1,2, YAO Zong-li1, LAI Qi-fang1, ZHOU Kai1, LIN Ting-ting1, WANG Hui1**   

  1. (1 Engineering Research Center for Salinealkali Water Fisheries, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China; 2Shanghai Ocean University, Shanghai 201306, China)
  • Online:2013-04-10 Published:2013-04-10

Abstract:

A singlefactor static acute toxicity test was conducted to study the effects of different concentrations K+ and Ca2+ in a water body with salinity 10 on the survival rate, oxygen consumption rate, and suffocation point of juvenile Barbus capito. At the K+ concentration 3.78-43530 mg·L-1 and Ca2+ concentration 11.01-1535.90 mg·L-1 (with 117.55 mg·L-1 of K+ and 116.59 mg·L-1 of Ca2+ as the controls), all the juveniles could survive. The 96 h LC50 of high concentration K+ and of low concentration Ca2+ was 515.01 mg·L-1 and 5.47 mg·L-1, respectively. At low concentration K+ (3.75±0.17 mg·L-1), no significant variations were observed in the oxygen consumption rate and suffocation point of juvenile Barbus capito (P>0.05); at high concentration K+ (451.67±10.23 mg·L-1), the oxygen consumption rate at 48 h had no significant difference with the control (P>0.05), but that at 72 h and 96 h increased significantly (P<0.05), and both the critical and the absolute suffocation points had a significant increase (P<0.05). At low concentration Ca2+ (8.87±0.34 mg·L-1) and high concentration Ca2 (129010±15.75 mg·L-1), the oxygen consumption rate presented the same tendency, i.e., increased significantly at 24 h (P<0.05), declined at 48 h, and had no significant difference with the control (P>0.05) at 96 h. Whether at low or at high concentration Ca2+, both the critical and the absolute suffocation points of the juveniles increased significantly (P<0.05), as compared to the control. To sum up, the juvenile Barbus capito had stronger tolerance to the K+ and Ca2+ in water body, especially to the low concentration K+ and high concentration Ca2+.