Here a link to some actual science about Pacific radiation levels due to Fukushima:
http://www.pacificfishing.com/PF_Nuke-Story.pdf
The take home: "Worrying about these traces is like worrying you’ll get sunburned by the stars at night. Distance and dilution are massive."t
That said, if you are afraid to eat what you catch, feel free to release it. Just don't expect me to do the same.
I'd worry much more about PCBs in San Diego Bay than radiation in the Pacific.