I'm no biologist or physicist, and will stand corrected if I'm wrong, but I think genetic mutations due to radioactivity don't manifest themselves until an exposed fish reproduces.
Radiation will kill ya if you're exposed to too much of it, and will cause radiation sickness (hair loss, nausea, etc) in non-lethal doses, but it won't make you grow another head. Your kids might come out that way, but I don't think you will
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