DAVID SUZUKI: Despite Fukushima, eating fish is safe

Radioactivity measurement shows trace amounts, but strontium levels must be watched

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. Natural, or background radiation, is found in many sources, including food items, medical treatments and air travel.

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. This is where we may find answers about the amount of radioactive material released, how it was dispersed and any repercussions for the environment and food sources.

The ocean is vast and dynamic with many complexities we don’t fully understand. It appears two currents off Japan’s coast — the Kuroshio Current and Kurushio Extension — diluted radioactive material to below WHO safety levels within the first four months of the disaster. Eddies and giant whirlpools, some tens of kilometres wide, continue the dilution and will direct radioactive particles to coastal areas for at least two decades.

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.

New concerns continue to arise. While the initial leak contained cesium isotopes, water flowing into the ocean from the plant now appears to be higher in strontium-90, a radioactive substance that is absorbed differently. While cesium tends to go in and out of the body quickly, strontium heads for the bones.

A huge accumulation of radioactive water at the plant must be dealt with immediately. Determining the full effects of years of exposure to lower levels of radioactive contamination leaking into the ocean will take time and require continued monitoring and assessment. While Health Canada monitors radionuclide levels in food sold in Canada, and one of its studies incorporates samples from Vancouver, we need to remain vigilant and demand timely monitoring results.

Any amount of leaked radiation is harmful to the planet and the health of all species, including humans. 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.

Just Posted

PHOTOS: Thousands raised for cancer at second annual Gala for Hope

Victoria Fire Department’s fundraiser a success ahead of Ride to Conquer Cancer

Crews respond to near drowning at Thetis Lake

Man taken to hospital after calls come in of drowning in progress

Vet services for Victoria’s pets of the homeless cancelled for first time in a decade

Vets for Pets faces a volunteer shortage that’s forced the group to cancel its recent service

Wooldog among mysteries uncovered with powerful UVic microscope

Finding ‘Mutton,’ a dog lost in a Smithsonian drawer for 150 years

Optometrist pedals through depression, leads others for the cause

Ride Don’t Hide bike rides start, end at Windsor Park

Victoria Weekender: What’s happening this weekend, June 15-16

Car Free YYJ, a barber battle and an Outdoor Discovery Day

Homalco tour gives glimpse into area’s ‘People, Land, Water’

First Nation business mixes cultural components with wildlife excursions

B.C. VIEWS: When farmland protection doesn’t protect farmers

Secondary residences aren’t mansions, families tell Lana Popham

Bombers down B.C. Lions 33-23 in season opener

Former Lion Andrew Harris leads Winnipeg with 148 rushing yards

Northern B.C. family remembers murdered Indigenous woman with memorial walk

Still no closure for Ramona Wilson’s family 25 years later

Monkey spotted on late-night jaunt in Campbell River

Conservation officers also apparently looking for cougar in the area

B.C. university to offer mentorship program for former youth in care

Students using the provincial tuition waiver program will soon be able to form a community at KPU

Cyclists competing in one of the toughest bike races on the planet pass through Fernie

Divide riders looking strong as they finish first leg of 4160 km race

You might not know these B.C. records are public

Hired a lawyer to file a civil claim? Those are published online

Most Read