More on the caesium in fish- rather old news but not widely reported.
Rockfish and rocktrout caught 55 km from Fukushima contained radioactive caesium levels exceeding an allowable limit, according to Greenpeace. See Mainichi Daily News, August 9, 2011.
Greenpeace data here: http://www.greenpeace.org/japan/Global/japan/pdf/110809GP_MarineResearch_Data.pdf
On August 19, the Canadian Food Inspection Agency started to test fish from offshore British Columbia for radiation. Salmon are sensitive because of their wide-ranging movements.
http://www.cbc.ca/news/technology/story/2011/08/19/bc-salmon-radiation-testing.html

In a related story, the Yukon began testing for radiation in the caribou herd. Test results on the Porcupine Caribou herd will be available next year.