中国黄河デルタのLiza haematocheilaとLateolabrax japonicusの魚組織中の金属のレベルと消費者へのリスク評価

Levels of metals in fish tissues of Liza haematocheila and Lateolabrax japonicus from the Yellow River Delta of China and risk assessment for consumers.

• Meng Ge
• Guijian Liu
• Houqi Liu
• Yuan Liu

抄録

黄河デルタ（YRD）は多くの魚類にとって重要な産卵・保育地である。YRDに広く分布する2種類の商業魚の筋肉、肝臓、エラ、皮膚中のFe、Al、Mn、Zn、Ni、Cr、Cu、Co、Pb、Cdの濃度を分析した。その結果、肝臓とエラは他の組織に比べて金属の蓄積性が高く、筋肉は常に金属の蓄積性が低いことが明らかになった。一般的に、魚の大きさと魚の組織中の金属の間には有意な反対の関係（p<0.05）が観察されたが、これは両魚種ともに、餌料率が低く、体の大きい個体ほど解毒・排泄機構が強いためと考えられる。筋肉中のすべての金属は、提案されている毒性限界値を十分に下回っていた。また、ヒトの健康リスク評価の結果によると、調査対象魚の筋肉を摂取した場合には、毒性の影響は発生しないと予想された。

The Yellow River Delta (YRD) is an important spawning and nursery area for numerous fishes. The concentrations of Fe, Al, Mn, Zn, Ni, Cr, Cu, Co, Pb and Cd in muscle, liver, gills and skin of two broadly distributed commercial fish in the YRD were analyzed. The results demonstrated that liver and gills displayed higher accumulation ability of metals than other tissues, while muscle always accumulated the lowest concentrations of metals. Generally, significant opposite relationships (p < 0.05) were observed between fish size and metals in fish tissues especially in muscles of both fish species which may be explained by the lower feeding rate, stronger detoxification and elimination mechanisms in the bigger individuals. All metals in muscles were well below the proposed toxic limit. Besides, the toxic effects were not expected to occur for the consumption of muscles of studied fish according to the results of human health risk assessment.

Copyright © 2020. Published by Elsevier Ltd.