The Tokyo Electric Power Company Fukushima Dai-ichi nuclear power plant in Fukushima-Ken, Japan, was destroyed in March 2011 due to a massive earthquake (magnitude 9) centred offshore to the northeast of Honshu Island and the subsequent historic tsunami on 11 March 2011. Due to nuclear meltdown, damage to the buildings housing the reactors by hydrogen explosions, and the contamination of cooling water from the reactor cores, huge quantities of radioisotopes were emitted to the atmosphere and to the adjacent seawater. Fishing is currently restricted off the coast of Fukushima-Ken. On 22–23 November 2012, the Tokyo University of Marine Science and Technology performed an independent sampling measure radioisotope levels in fishery species off Iwaki-Shi (City), Fukushima-Ken. These data included detailed measurements of individual fish, such as weight, sex, length, and collection locality. [1] In spite of Grand Fish Weight % of Okamejei kenojei and Sebastes chenj in Fukushima-Ken EEZ were 26.6 Weight% and 13.7 Weight% respectively, Okamejei kenojei’s fish bodies and Sebastes chenj’s fish bodies in Fukushima-Ken EEZ had 49.3 becquerel% and 33.0 becquerel% of 134Cs in fish in Fukushima-Ken EEZ respectively and had 50.4 becquerel% and 31.7 becquerel % of 137Cs in fish in Fukushima-Ken EEZ respectively. [2] It indicates that Acanthopagrus schlegeli, Clupea pallasii Vakenciennes, Engraulis japonica, Lepidotrigla microptena Gunther, Liparis tanakai, Mustelus manazo, Oncorhynchus keta, Oplegnathus punctatus, Pagrus major, Pagrus major (Fry), Paralichthys olivaceus (Fry), Platycephalus sp.2, Platycephalus sp.2 (fry), Takifugu poecilonotus, Takifugu snyderi, Takifugu stictonotus, Trachurus japonicas and Zeus faber Linnaeus fishes do not have ability to accumulate 134Cs and 137Cs radioisotopes. In other words these species have ability to evacuate 134Cs and 137Cs radioisotopes from their bodies. [3] It has possibility to take accumulation or separation for specific nuclides 134Cs and 137Cs by combination of Sebastes cheni and Kareius bicoloratus and combination of Ditrema temminkii and Cynoglossus joyneri. . [4] Pagrus major and Platycephalus sp.2 did not have ability to accumulate both 134Cs and 137Cs. They did not have any differences between adult fish and fry for accumulation 134Cs and 137Cs. [5] It has actual differences between adult fish and fry of Paralichthys olivaceus for accumulation 134Cs and 137Cs.

Accumulation of specific nuclides by fish bodies in Fukushima-Ken (Prefecture) EEZ (Exclusive Economic Zone), Japan in November 2012

249th National Meeting (2015)

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