Institute for Medical Research and Occupational Health, Ksaverska cesta 2, 10001, Zagreb, Croatia.
Institute of Oceanography and Fisheries, PO Box 500, 21000, Split, Croatia.
Chemosphere. 2021 Dec;284:131402. doi: 10.1016/j.chemosphere.2021.131402. Epub 2021 Jun 30.
This study examined total mercury (THg) and selenium (Se) levels in archive samples (white and red muscles, liver, gills) of the wild Atlantic bluefin tuna (ABFT) (Thunnus thynnus) (n = 18) captured in the central Adriatic Sea. The influence of fish size, age, and tissue type on element distribution was examined. There were significant differences in THg and Se levels, and Se:THg molar ratios among tissues. THg levels were highest in liver and lowest in gills (liver > red muscle > white muscle > gills), while Se levels were also highest in liver but lowest in white muscle (liver > red muscle > gills > white muscle). Se:THg molar ratios were highest in gills (22-82), intermediate in liver (11-29) and red muscle (7-36), and lowest in white muscle (1.7-7.6). Concentrations of THg in all tissues and Se in liver and caudal muscle were positively correlated with tuna age and size, while the Se:THg molar ratio in gills and all white muscles was negatively correlated with tuna age and size, indicating that the protective role of Se against THg is reduced in older specimens. The selenium health benefit values (HBV) were above zero in all tissues, indicating a small excess of Se after Hg sequestration. However, since the obtained HBV for edible tissues were near zero (0.01-0.04), and more than 70% of white muscle samples and all red muscle samples exceeded the EU regulatory limit for THg in fish muscle, it would be advisable to limit their intake in adults to one meal per month.
本研究检测了在亚得里亚海中部捕获的野生大西洋蓝鳍金枪鱼（Thunnus thynnus）（n=18）的档案样本（白肌、红肌、肝脏、鳃）中的总汞（THg）和硒（Se）水平。研究考察了鱼体大小、年龄和组织类型对元素分布的影响。THg 和 Se 水平以及 Se:THg 摩尔比在组织之间存在显著差异。THg 水平在肝脏中最高，在鳃中最低（肝脏>红肌>白肌>鳃），而 Se 水平在肝脏中最高，但在白肌中最低（肝脏>红肌>鳃>白肌）。Se:THg 摩尔比在鳃中最高（22-82），在肝脏和尾肌中居中（11-29），在白肌中最低（1.7-7.6）。所有组织中的 THg 浓度和肝脏及尾肌中的 Se 浓度与金枪鱼年龄和大小呈正相关，而鳃和所有白肌中的 Se:THg 摩尔比与金枪鱼年龄和大小呈负相关，表明 Se 对 THg 的保护作用在较老的样本中降低。所有组织的硒健康效益值（HBV）均为正值，表明 Hg 螯合后 Se 略有过剩。然而，由于可食用组织的获得 HBV 接近零（0.01-0.04），并且超过 70%的白肌样本和所有红肌样本的 THg 含量超过了欧盟对鱼类肌肉中 THg 的监管限值，因此建议成年人每月限制食用一次。
