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首页> 外文期刊>Comparative Medicine >Effects of Total Hardness and Calcium:Magnesium Ratio of Water during Early Stages of Rare Minnows (Gobiocypris rarus)
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Effects of Total Hardness and Calcium:Magnesium Ratio of Water during Early Stages of Rare Minnows (Gobiocypris rarus)

机译：稀有Min鱼（Gobiocypris rarus）早期总硬度和水钙镁比的影响

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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.
机译：水的离子组成对所有鱼类都很重要。在本研究中，评估了总硬度和Ca2 +：Mg2 +比例对稀有小鱼（Gobiocypris rarus）（中国有希望的实验鱼）的早期生命期的影响。将成对的亲鱼转移到产卵的水族箱（16 L）中，水的总硬度和Ca：Mg的比例不同，它们的后代在25 +/- 1摄氏度和12：12-h的光：暗光周期中进一步养殖。 480 mg L-1 CaCO3对总硬度的影响不大，但随着总硬度的增加，卵的大小会降低。 Ca：Mg比例小于1:20或大于8：1对孵化，摄食，发育，幼虫生长和生存有不利影响。在缺乏Mg2 +和Ca2 +的水中孵育的胚胎和幼虫显示出高畸形率和高死亡率。我们的结果表明，尽管水中的Ca2 +和Mg2 +之间的不平衡对该物种有毒，但稀有的小鱼可以适应很宽的总硬度和Ca：Mg比例。为了提高测试结果的可比性和实用性，我们建议使用具有规定的总硬度和Ca：Mg比的再生水或饮用水进行稀有小鱼的培养和毒性测试。

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