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首页> 外文期刊>Environmental toxicology and chemistry >EFFECT OF BISPHENOL A ON THE EARLY LIFE STAGE IN JAPANESE MEDAKA (ORYZIAS LATIPES)
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EFFECT OF BISPHENOL A ON THE EARLY LIFE STAGE IN JAPANESE MEDAKA (ORYZIAS LATIPES)

机译：双酚A对日本产中成药（早熟菜）早期阶段的影响

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摘要

Japanese medaka (Oryzias latipes) were exposed to bisphenol A (BPA) at the sublethal concentrations of 2.28, 13.0, 71.2, 355, and l,820 ug/L (as mean measured concentrations) in the early life stage from fertilized eggs to 60-d posthatch. Except for the growth and sexual differentiation of the fish at 60-d posthatch, no effects were observed on hatching success and time to hatching in embryological stage and on mortality and abnormal behavior and appearance in hatched larvae. The growth of the fish was suppressed with increasing BPA concentrations, resulting in significant differences in both the total length and body weight of medaka at l,820 ug/L compared with the controls. When observed for their external secondary sex characteristics, no males were identified in the 1,820-ug/L treatment. In addition, histological examination showed that 32 of fish in the 1,820-ug/L group had testis-ova composed of both testicular germ cells and oocytes. Consequently, the lowest effective concentration for the early life stage of medaka was between 355 and l,820 ug/L. Since the environmental concentrations of BPA are usually three orders lower than the lowest effective concentration, BPA alone may not affect the early life stage of wild fish populations.
机译：从受精卵到60年代早期，日本（Oryzias latipes）在亚致死浓度分别为2.28、13.0、71.2、355和1820 ug / L（平均测量浓度）下暴露于双酚A（BPA）。 -d孵化后。除了在孵化后60天鱼的生长和性别分化外，未观察到孵化成功和孵化到胚胎期的时间以及孵化幼虫的死亡率，异常行为和外观没有影响。与BPA浓度相比，鱼的生长受到BPA浓度增加的抑制，导致medaka的总长度和体重均显着不同，分别为1,820 ug / L。当观察其外部第二性征特征时，在1,820-ug / L处理中未发现任何男性。此外，组织学检查显示，在1,820-ug / L组中，有32条鱼的睾丸卵由睾丸生殖细胞和卵母细胞组成。因此，高生命早期的最低有效浓度在355至1,820 ug / L之间。由于BPA的环境浓​​度通常比最低有效浓度低三个数量级，因此仅BPA可能不会影响野生鱼类种群的早期生命阶段。

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