Impact of the Fukushima Dai-ichi Nuclear Power Plant Accident on dolphin fishes in the Northwest Pacific.

Abstract More than 9 years since the Fukushima Dai-ichi Nuclear Power Plant Accident (FDNPPA), the impact of FDNPPA on marine biota is being revealed. In this work, the evolution of FDNPPA derived 134Cs, 137Cs and 110mAg in dolphin fishes (Coryphaena hippurus) in the Northwest Pacific from Dec. 2011 to Sept. 2018 were studied. Bioconcentration factors (BCF) of radiocesium (29–69 with the average of 48) in dolphin fishes were calculated. The background level of 137Cs in dolphin fishes (