Effects of Total Hardness and Calcium:Magnesium Ratio of Water during Early Stages of Rare Minnows (Gobiocypris rarus)

文献类型： 外文期刊

第一作者： Luo, Si

作者： Luo, Si;Wu, Benli;Xiong, Xiaoqin;Wang, Jianwei;Luo, Si;Wu, Benli;Xiong, Xiaoqin;Wu, Benli

作者机构：

期刊名称：COMPARATIVE MEDICINE （ 影响因子：0.982； 五年影响因子：1.347 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： The ionic composition of water is important for all fish. In the present study, the effects of total hardness and Ca2+:Mg2+ ratio on early life stages of rare minnows (Gobiocypris rarus), a promising laboratory fish in China, were evaluated. Paired parent fish were transferred to spawning aquaria (16 L) containing water at different total hardness and Ca:Mg ratios, and their offspring were further cultured at 25 +/- 1 degrees C and 12:12-h light:dark photoperiod. Fertilization rates were not affected by total hardness to 480 mg L-1 CaCO3, but egg size decreased with increasing total hardness. Ca:Mg ratios less than 1:20 or greater than 8:1 had adverse influences on hatching, feeding, development, larval growth, and survival. Embryos and larvae incubated in Mg2+- and Ca2+-deficient waters exhibited high malformation rates and high mortality. Our results demonstrate that rare minnows can adapt to a wide range of total hardness and Ca:Mg ratios, although an imbalance between Ca2+ and Mg2+ in water is toxic to this species. To increase the comparability and usefulness of test results, we recommend the use of reconstituted or drinking water of defined total hardness and Ca:Mg ratio for the culture and toxicity testing of rare minnows.

分类号： S8

  • 相关文献
作者其他论文 更多>>

微信小程序