This 2015 video says about itself:
A Japanese fisherman has reeled in a HUGE wolffish – and it has raised concerns about the effects of the Fukushima nuclear disaster in 2011.
From NewsOnJapan.com, May 8 2012:
Ibaraki prefecture catches the most wild eel in the entire country, and the Kasumigaura area is especially well known for producing eel.
Lately, eel from Kasumigaura in Ibaraki prefecture were found to have radioactive cesium levels of 180 becquerel (Bq) per kilogram, while eels from the Nakagawa river system and surrounding ponds were found with 110 Bq per kilogram.
Because these numbers are above the new standards implemented in April, the government issued a suspension on shipments of eel from the Ibaraki area.
Tuna carry Fukushima radiation to California: here.