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For what it's worth (and without really wanted to dive headfirst into a contentious debate), radiation levels have returned to normal outside of the Fukushima zone. I can see where the concern with fisheries, and specifically bottom feeding animals like red king crab, but everything reliable I've seen says there's no additional risk. Everything I see via Google that does say there's a problems seems to be of the Greenpeace or conspiracy theory slant. Even right after the event the levels of radioactive cesium in the ocean directly around Fukushima were below threat levels for humans, so it's unlikely it posed much threat once diluted by the pacific ocean.
I'm not saying nuclear contamination is awesome, but if you're going to be concerned about a contaminated ocean I'd focus on mercury and other stuff that comes from burning coal. Just remember - to date their have been 0 deaths from radiation exposure at Fukushima.
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