title: Use of otolith for detecting strontium-90 in fish from the harbor of Fukushima Dai-ichi Nuclear Power Plant.
abstract: To clarify the level of contamination with radioactive cesium (radiocesium) discharged from Fukushima Dai-ichi Nuclear Power Plant (FDNPP), three fish species caught in the main harbor of FDNPP were subjected to γ-ray analysis. The concentration of radiocesium in muscle differed among individual fish, even those of similar size of the same species, and showed little relation to the standard length of fish. The maximum concentration of radiocesium (202 kBq/kg wet) was detected from fat greenling samples. A comparison to data from outside the port indicated that the level of radiocesium contamination inside the port was higher than that outside. We found that β-rays were emitted from otoliths of fishes caught in the port of FDNPP. β-ray intensities were correlated with the concentrations of radiocesium in muscles of the three fish species. In Japanese rockfish, the β-ray count rates from otoliths were significantly correlated with the concentration of radiocesium and (90)Sr in the whole body without internal organs of Japanese rockfish. However, no β-rays were detected from brown hakeling samples collected around FDNPP, suggesting that the detection of β-rays from otoliths may indicate living in the main harbor of FDNPP.
authors.affiliation: †Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4, Fuku-ura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan.
authors.forename: Ken
authors.initials: K
authors.lastname: Fujimoto
authors.affiliation: †Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4, Fuku-ura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan.
authors.forename: Shizuho
authors.initials: S
authors.lastname: Miki
authors.affiliation: †Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4, Fuku-ura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Kaeriyama
authors.affiliation: †Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4, Fuku-ura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan.
authors.forename: Yuya
authors.initials: Y
authors.lastname: Shigenobu
authors.affiliation: ‡National Research Institute of Aquaculture, Fisheries Research Agency, 2482-3, Chuguji, Nikko, Tochigi 321-1661, Japan.
authors.forename: Kaori
authors.initials: K
authors.lastname: Takagi
authors.affiliation: †Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4, Fuku-ura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Ambe
authors.affiliation: †Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4, Fuku-ura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan.
authors.forename: Tsuneo
authors.initials: T
authors.lastname: Ono
authors.affiliation: †Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4, Fuku-ura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan.
authors.forename: Tomowo
authors.initials: T
authors.lastname: Watanabe
authors.affiliation: †Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4, Fuku-ura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Morinaga
authors.affiliation: §Head Office of Fisheries Research Agency, Queen's Tower B 15F, 2-3-3, Minato Mirai, Nishi-ku, Yokohama, Kanagawa 220-6115, Japan.
authors.forename: Kaoru
authors.initials: K
authors.lastname: Nakata
authors.affiliation: †Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4, Fuku-ura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan.
authors.forename: Takami
authors.initials: T
authors.lastname: Morita
mesh_terms: D000818:Animals; D002588:Cesium Radioisotopes / Q000032:analysis; D005399:Fishes / Q000378:metabolism*; D062406:Fukushima Nuclear Accident; D005843:Geography; D007564:Japan; D009132:Muscles / Q000378:metabolism; D055848:Nuclear Power Plants; D010037:Otolithic Membrane / Q000378:metabolism*; D011834:Radiation Monitoring; D013324:Strontium / Q000032:analysis*; D013326:Strontium Radioisotopes / Q000032:analysis
chemical_list: D002588:Cesium Radioisotopes; D013326:Strontium Radioisotopes; D013324:Strontium