The environmental exposure to As, Se, Hg, Pb, Cr and toxaphene was assessed for 11 freshwater fish species in irrigation channels, agricultural return flow drains, a drain collecting lagoon and sections of the Colorado River at the Mexicali valley in Baja California, México, during August 2015-April 2016. Arsenic (2.90 ng ml-1) and Se (1.41 ng ml-1) in water had the highest concentrations in the return flow drains (Hardy River and Xochimilco Lagoon, respectively). However, fish axial muscle tissue had the highest concentration of Se (8.3 µg g-1) and Hg (0.36 µg g-1) in Colorado River fresh water, while As (1.7 µg g-1) in Hardy River fish was highest. Selenium concentrations in all fishes and toxaphene in Cyprinus carpio and Ameiurus natalis are above the safe levels for human consumption (0.3 µg g-1 and 180 ng g-1 respectively). Toxaphene was detected in the fish axial tissue, having the highest concentrations in Poecilia latipinna (690 ng g-1) in the Colorado River. The low proportion of the 8-Cl toxaphene congeners in fish suggests degradation of this pollutant. Tilapia. sp. cf. zillii had the most genotoxic damage with 7.4 micronucleated erythrocytes per 10,000 erythrocytes in Xochimilco Lagoon and 2 in Hardy River. The genotoxicity in all the fish species studied was significantly correlated to the concentrations of As and Se in water.

中文翻译：

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墨西哥下加利福尼亚州墨西卡利河谷科罗拉多河下游流域环境中暴露于砷，硒，汞，铅，铬和毒杀芬的鱼类的遗传毒性。

在墨西哥下加利福尼亚州的墨西卡利河谷，评估了灌溉渠道，农业回流排水，排水收集泻湖和科罗拉多河部分地区的11种淡水鱼类对砷，硒，汞，铅，铬和毒杀芬的砷，硒，汞，铅，铬和毒杀芬的环境暴露。 ，在2015年8月至2016年4月期间。回水排水口（分别是哈迪河和霍奇米尔科泻湖）的水中砷（2.90 ng ml-1）和硒（1.41 ng ml-1）的浓度最高。然而，在科罗拉多河淡水中，鱼类的轴向肌肉组织中的Se（8.3 µg g-1）和Hg（0.36 µg g-1）的浓度最高，而Hardy River鱼中的As（1.7 µg g-1）的浓度最高。鲤鱼和纳木斑鱼中所有鱼类和毒杀芬中的硒含量都超过了人类食用的安全水平（分别为0.3 µg g-1和180 ng g-1）。在鱼的轴向组织中检测到了毒杀芬，在科罗拉多河的Poecilia latipinna（690 ng g-1）中浓度最高。鱼中8-Cl毒杀芬同源物的比例低表明该污染物已降解。罗非鱼。sp。cf. Zillii具有最高的遗传毒性损害，在霍奇米尔科泻湖中，每10,000个红细胞中有7.4个微核红细胞，在哈迪河中则为2个。研究的所有鱼类的遗传毒性与水中砷和硒的浓度显着相关。霍奇米尔科泻湖中的000个红细胞和哈代河中的2个。研究的所有鱼类的遗传毒性与水中砷和硒的浓度显着相关。霍奇米尔科泻湖中的000个红细胞和哈代河中的2个。研究的所有鱼类的遗传毒性与水中砷和硒的浓度显着相关。