Radioactive cesium levels in most kinds of fish caught off the coast of Fukushima haven't declined in the year following Japan's nuclear disaster, a signal that the seafloor or leakage from the damaged reactors must be continuing to contaminate the waters, possibly threatening fisheries for decades, a researcher says. Though the vast majority of fish tested off Japan's northeast coast remain below recently tightened limits of cesium-134 and cesium-137 in food consumption, Japanese government data shows that 40 percent of bottom dwelling fish such as cod, flounder and halibut are above the limit, Ken Buesseler, a marine chemist at the Woods Hole Oceanographic Institution in Massachusetts, wrote in an article published Thursday in the journal Science.

Japan fish cesium levels remain. (2012, October 30). Manila Bulletin, p. B-8.