PS: I’ve taken classes on the subject too, and performed experiments with radiation. It’s really not that obscure - the content is available in reliable websites online (i.e., EPA documentation)
Then you should know better than to make unscientific speculations about the Fukushima radiation. Not only that, but if you are a marine biologist, you should have a pretty good idea of what causes massive fish kills—a better idea than I do, since my specialty is human health.
The last time I took a class on radiation, I got to handle a piece of trinitite. I also used to use radioisotopes for labeling biological molecules all the time. Then I had a scan done, and was injected with a higher quantity of radiation than all I have ever handled, combined. And I’m still alive.