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首页> 外文期刊>Journal of Tropical Forestry and Environment >Cadmium Induced Adverse Effects on Fry of Oreochromis mossambicus
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Cadmium Induced Adverse Effects on Fry of Oreochromis mossambicus

机译：镉诱导莫桑比克色拉鱼苗的不良反应

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This study investigates the effects of Cadmium (Cd) on fry of the Mozambique Tilapia Oreochromis mossambicus using standard toxicity tests. Fry were repeatedly exposed to five concentrations (0.002 – 2.0 mgl-1) of Cd and survival, growth and swimming activity were monitored over 10 days. These trials revealed that all the tested concentrations significantly enhanced mortality of the fry with concentrations above 1.0 mgl-1 resulting in 100% mortality. ?Mortality was positively related to the exposure level indicating dose-dependency. The LC50 1-10days ranged from 0.02 to7.26 mgl-1. Fry exposed to Cd also exhibited an increase in swimming activity in comparison to those that were not exposed indicating abnormal behaviour. Nevertheless, there was no apparent growth retardation and gross morphological defects during the brief exposure period. These findings are significant because the lethal and sublethal effects in fry were also apparent at Cd concentrations of 0.001 – 0.2 mgl-1, which are typically recorded in fresh waterbodies in Sri Lanka.Keywords: ?Cadmium, Oreochromis mossambicus, survival, toxicity, Sri Lanka
机译：这项研究使用标准毒性试验研究了镉（Cd）对莫桑比克罗非鱼Oreochromis mossambicus鱼苗的影响。将鱼苗反复暴露于五种浓度（0.002 – 2.0 mgl-1）的镉中，并在10天内监测其存活，生长和游泳活动。这些试验表明，所有测试浓度均显着提高了鱼苗的死亡率，高于1.0 mgl-1的浓度可导致100％死亡率。死亡率与暴露水平呈正相关，表明剂量依赖性。 1-10天的LC50为0.02至7.26 mgl-1。与未暴露于镉的鱼苗相比，未暴露于镉的鱼苗的游泳活动也有所增加。然而，在短暂的暴露时间内，没有明显的生长迟缓和明显的形态缺陷。这些发现具有重要意义，因为在0.001 – 0.2 mgl-1的Cd浓度下，鱼苗的致死和亚致死作用也很明显，这通常记录在斯里兰卡的淡水水中。兰卡

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