Stable Isotope Ratio Analysis for Verifying the Geographical Origin of Cultured Eel in Japan

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  • Nakashita Rumiko
    Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University
  • Suzuki Yaeko
    Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University
  • Ichimiya Takahiro
    Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University
  • Korenaga Takashi
    Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University

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  • 生元素安定同位体比解析による養殖ウナギの産地判別の可能性
  • セイゲンソ アンテイ ドウイタイヒ カイセキ ニ ヨル ヨウショク ウナギ ノ サンチ ハンベツ ノ カノウセイ

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We determined the carbon, nitrogen, and oxygen isotope ratios of domestic and imported (China and Taiwan) cultured eel, to devise a tool for verifying the geographical origin of eel commercially distributed in Japan. Carbon and nitrogen isotope ratios of domestic eel (δ13C=-17.6±0.6‰ (mean±SD), δ15N=+16.4±0.7‰) were higher than those of Taiwan (δ13C=-20.5±0.7‰, δ15N=+13.2±1.5‰) and Chinese (δ13C=-21.4±0.5‰, δ15N=+14.3±0.9‰) eel. On the other hand, the oxygen isotope ratio of domestic eel (+7.4±1.4‰) was lower than that of Taiwan (+10.0±1.3‰) and Chinese (+11.1±0.9‰) eel. These results suggest that carbon, nitrogen and oxygen stable isotope-ratio analysis is applicable as a potential tool for discriminating between domestic and imported cultured eels.

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