The radioactivity had no known effects on the giant kelp, or on fish and other marine life, and it was undetectable a month later...
Iodine 131 “has an eight-day half life so it’s pretty much all gone,” Manley said...
“In terms of overall exposure to the kelp bed itself, it’s not a huge amount,” said Manley. It would not have harmed the kelp...
Don't go away mad... just go away!
You cherry picked those quotes and omitted the one about that it would be better if it never happened in the first place.
So far, I’ve given you spotty results from New Zealand and California, in Japan it’s gut wrenching but don’t worry about it.