Universidad Autónoma Metropolitana - Iztapalapa, San Rafael Atlixco No. 186, Col. Vicentina, 09340, Iztapalapa, Mexico.
Department of Hydrobiology, Universidad Autónoma Metropolitana - Unidad Iztapalapa, San Rafael Atlixco No. 186, Col. Vicentina, 09340, Iztapalapa, Mexico.
Environ Monit Assess. 2018 Apr 14;190(5):280. doi: 10.1007/s10661-018-6670-y.
Oreochromis niloticus was used to determine the effects of heavy metals and their concentration in aquatic environments. Its wide distribution, resistance, and economical importance make it a suitable biomonitor. The present study was conducted in the Tenango Dam (Puebla, Mexico) to determine water quality and its impact on O. niloticus, a species that is cultured and commercialized in this area. Five samples were collected over 1 year to evaluate the water's physicochemical parameters (temperature, dissolved oxygen, pH, and hardness) and metal contents (cadmium, chromium, copper, and lead). Metal concentrations, bioconcentration factors, and metallothionein levels were also assessed in O. niloticus livers and muscle tissues. Water and tilapia quality were estimated according to current Mexican guidelines. Results indicated that the water's physicochemical parameters were within acceptable ranges. Metal concentrations, however, suggested that this resource was not suitable for urban use. Moreover, metal levels in fish tissues exceeded the acceptable limits during two periods, rendering it unsuitable for human consumption. The bioconcentration factor indicated that the metals can potentially accumulate in organisms. Furthermore, metallothionein levels in liver and muscle showed a direct correlation with metal concentrations in these tissues. This is the first study to use tilapia as an indicator of contamination in the Tenango Dam, and also the first to describe the presence of metals in this water body.
奥利亚罗非鱼被用于确定重金属及其在水生环境中的浓度的影响。其广泛的分布、抗性和经济重要性使其成为一种合适的生物监测器。本研究在特南戈大坝（墨西哥普埃布拉州）进行，以确定水质及其对奥利亚罗非鱼的影响，该物种在该地区养殖和商业化。在一年的时间里收集了五个样本，以评估水的物理化学参数（温度、溶解氧、pH 值和硬度）和金属含量（镉、铬、铜和铅）。还评估了奥利亚罗非鱼肝脏和肌肉组织中的金属浓度、生物浓缩因子和金属硫蛋白水平。根据墨西哥现行指南评估水和罗非鱼的质量。结果表明，水的物理化学参数在可接受的范围内。然而，金属浓度表明该资源不适合城市使用。此外，在两个时期，鱼类组织中的金属含量超过了可接受的限度，因此不适合人类食用。生物浓缩因子表明，这些金属可能会在生物体内积累。此外，肝脏和肌肉中的金属硫蛋白水平与这些组织中的金属浓度呈直接相关。这是首次使用罗非鱼作为特南戈大坝污染的指示剂的研究，也是首次描述该水体中存在金属的研究。
