中文摘要：文章分析了中国南部2个网箱养殖场的14种鱼类体内汞含量和稳定汞同位素比值，所有品种的指标值均低于人类健康筛检值，但是人类通过食用大量肉食性鱼类而暴露于汞元素的值超过了USEPA的规定剂量。商业化的颗粒饲料及新鲜的鱼类内脏是养殖鱼类体内甲基水银的主要来源，在汞同位素特征谱中占主导。文章应用混合模型阐明，非肉食性鱼类体内的汞主要来源于商业颗粒料，肉食性鱼类体内的汞来源于商业颗粒料和内脏。同时，甲基汞的浓度和比重与ΔHg-202值成正相关，而跟ΔHg-199值不相关，主要与鱼类日粮的组成有关。影响网箱养鱼模式的环境因素如鱼类粪便、不可食用的内脏等持续不断地向环境中排放有机汞，这一现象必须要引起重视。
 
外文摘要：Coasts of South China have experienced an unprecedented growth in its marine-caged fish industry. We analyzed mercury concentrations and stable mercury isotope ratios in fourteen fish species from two cage-cultured farms in Southern China. Total mercury concentrations of all species were lower than the human health screening values, but the human exposures through consumption of several carnivorous fish exceeded the USEPA's reference dose. Isotopic compositions in the sediment (delta Hg-202: 1.45 parts per thousand to -1.23 parts per thousand; Delta Hg-199: -0.04 parts per thousand to -0.01 parts per thousand) suggested that mercury in these farms were from coal combustion and industrial inputs. Commercial food pellets and fresh fish viscera provided the major sources of methylmercury to the farmed fish and dominated their mercury isotopic signatures. Non-carnivorous fish presented lower delta Hg-202 and Delta Hg-199 values than the carnivorous fish. Using a mixing model, we demonstrated that the majority of mercury in non-carnivorous species came from pellets and in carnivorous fish came from combined diets of pellets and viscera. Meanwhile, methylmercury concentrations and % methylmercury in the fish were positively correlated with delta Hg-202 values but not with Delta Hg-199 values, mainly because fish eating similar feeds maintained similar Delta Hg-199 values. Environmental influences of cage farming such as fish feces and uneaten viscera that continuously provide organic mercury to the environments need to be considered.
外文关键词：Mercury； Source tracking； Farmed fish； Diets； Methylmercury
作者：Xu, XY; Wang, WX
作者单位：香港科技大学深圳研究院
期刊名称：ENVIRONMENTAL POLLUTION
期刊影响因子：2.76
出版年份：2017
出版刊次：1
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