What are the "crazy low levels" of cesium found in krill and squid, and other lower food chain levels that cold water anadromous fish depend upon?
I have caught chinook covered with sea lice and bellies full of squid, meaning they were in salt fewer than eight hours ago.
How do these smaller critters assay? Do these harmless currents also bring fewer of them? We are in the midst of a miserable return of salmon and steelhead.
Isotopes, blobs, acidification, washing machines, cruise and freighter ship crap, hospital waste, dead Asians, etc.....it's getting nasty out there.
Maybe not presently for your average 300 pound American screen watcher, but it'll catch up. 
I don't believe anybody anymore. Neither the alarmists nor the professional soothers.