Following Japan’s devastating 2011 earthquake and tsunami, fear spread about risks of leaked radiation from the Fukushima Daiichi nuclear power plant — for the health of those living in or near Fukushima or involved in cleanup efforts and for the planet and the potential impacts on our complex marine food web.
Shunichi Tanaka, head of Japan’s Nuclear Regulation Authority, told reporters radioactive water has likely been leaking into the Pacific Ocean since the disaster hit. It’s the largest single contribution of radionuclides to the marine environment ever observed, according to one report. With 300 tonnes of contaminated water pouring into the sea every day, Japan’s government finally acknowledged the urgency of the situation in September. Social media is now abuzz with people swearing off fish from the Pacific Ocean. Given the lack of information around containment efforts, some may find this reasonable. But preliminary research shows fish caught off Canada’s Pacific coast are safe to eat.
It will take about three years from the time of the incident for the radiation plume to reach the west coast, which would be early next year. Recent testing of migratory fish, including tissue samples collected from Pacific bluefin tuna caught off the California coast, assessed radiation levels and potential effects on marine food webs far away from Japan. Trace amounts of radioisotopes from the Fukushima plant were found, although the best available science puts them at levels below those naturally occurring in the environment around us. The most comprehensive health assessment, by the World Health Organization, concludes radioactive particles that make their way to North America’s waters will have a limited effect on human health, with concentrations predicted to be below WHO safety levels.
More reports are in the works. The UN agency charged with assessing global levels and consequences of ionizing radiation will present its findings to the UN General Assembly this month. Meanwhile, fish from the water near the crippled plant are not faring so well. High levels of cesium-134, a radioactive isotope that decays rapidly, were found in fish samples there. Radiation levels in the sea around Japan have been holding steady and not falling as expected, further demonstrating that radiation leakage is not under control. At least 42 fish species from the immediate area are considered unsafe for consumption, and fisheries there remain closed.
A major release of radioactivity, such as that from Fukushima, is a huge concern, with unknowns remaining around long-term health risks such as cancers. That doesn’t mean it’s unsafe to eat all fish caught on the Pacific West Coast. I’m taking a precautionary approach: fish will stay part of my diet as long as they’re caught locally and sustainably and will remain so until new research gives me pause to reconsider.
David Suzuki is host of CBC’s The Nature of Things and author of more than 30 books on ecology.
