Analysis of Ciguatoxins in the Spotted Knifejaw, <i>Oplegnathus punctatus</i> from the Waters of Japan

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  • Tomikawa Takumi
    National Institute of Health Sciences Graduate School of Science and Technology, Teikyo University of Science
  • Kuniyoshi Kyoko
    National Institute of Health Sciences
  • Ito Shiori
    National Institute of Health Sciences Fuculty of Life & Environmental Sciences, Teikyo University of Science
  • Sakugawa Satsuki
    Okinawa Prefectural Institute of Health and Environment
  • Ishikawa Akira
    Graduate School of Bioresources, Mie University
  • Saito Toshio
    School of Marine Science and Technology, Tokai University
  • Kojima Takashi
    Fuculty of Life & Environmental Sciences, Teikyo University of Science
  • Asakura Hiroshi
    National Institute of Health Sciences
  • Ikehara Tsuyoshi
    Course of Resource Management and Food Science, Graduate School of Fisheries Science, National Fisheries University
  • Oshiro Naomasa
    National Institute of Health Sciences

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Other Title
  • 日本沿岸産イシガキダイのシガトキシン分析
  • ニホン エンガンサン イシガキダイ ノ シガトキシン ブンセキ
  • Analysis of Ciguatoxins on the Spotted Knifejaw, Oplegnathus punctatus from the Waters of Japan

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Abstract

<p>Ciguatera fish poisoning (CFP) is recognized as the most frequent seafood poisoning due to the consumption of fish containing the principal toxins, ciguatoxins (CTXs). In Japan, CFP events have been reported annually from Okinawa and Amami Islands, locating subtropical regions. In addition, there have been reported several outbreaks due to consumption of the fish caught from the Pacific coast of the Mainland and they were often caused by the matured spotted knifejaw, Oplegnathus punctatus. As part of our research on CFP in Japan, we investigated CTXs analysis by LC-MS/MS on 176 individuals of O. punctatus (weight: 100–6,350 g, standard length: 13–60 cm) from the coast of the Mainland (Honshu, Shikoku, and Kyushu), Amami, Okinawa, and Ogasawara (Bonin) Islands. CTXs were detected from only two specimens collected from Okinawa. Total CTXs levels of the two specimens were at 0.014 and 0.040 μg/kg, respectively, exceeding FDA guidance level at 0.01 μg CTX1B equivalent/kg. However, they might be little risk of CFP because consuming over 1.5 kg of flesh is needed to develop intoxication. The toxins consisted of CTX1B analogs including CTX1B, 52-epi-54-deoxyCTX1B, CTX4A, and CTX4B, and no CTX3C analogs, supporting the finding that ciguatoxic fishes in Okinawan Waters containing only CTX1B analogs.</p>

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