There is limited research on the effect of electromagnetic field on aquatic organisms, especially freshwater fish species. This study was conducted to evaluate the effect of extremely low frequency electromagnetic field (ELF-EMF) (50 Hz) exposure on brain histopathology of Cyprinus carpio, one of the important species of Caspian Sea with significant economic value. A total of 200 healthy fish were used in this study. They were classified randomly in two groups: sham-exposed group and experimental group, which were exposed to five different magnetic field intensities (0.1, 1, 3, 5, and 7 mT) at two different exposure times (0.5 and 1 h). Histologic results indicate that exposure of C. carpio to artificial ELF-EMF caused severe histopathological changes in the brain at field intensities ≥3 mT leading to brain necrosis. Field intensity and duration of exposure were key parameters in induction of lesion in the brain. Further studies are needed to elucidate exact mechanism of EMF exposure on the brain.

中文翻译：

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极低频电磁场对里海鲤鱼脑组织病理学的影响。

关于电磁场对水生生物特别是淡水鱼类的影响的研究还很有限。这项研究旨在评估极低频电磁场（ELF-EMF）（50 Hz）暴露对鲤鱼的脑组织病理学的影响，鲤鱼是里海的重要物种之一，具有重要的经济价值。这项研究总共使用了200条健康鱼。将它们随机分为两组：假暴露组和实验组，分别在两个不同的暴露时间（0.5和1 h）下暴露于五种不同的磁场强度（0.1、1、3、5和7 mT）。组织学结果表明，在电场强度≥3mT的情况下，鲤鱼衣原体暴露于人工ELF-EMF会引起脑部严重的组织病理学变化，从而导致脑坏死。场强和暴露持续时间是诱发脑部病变的关键参数。需要进一步的研究以阐明EMF暴露于大脑的确切机制。