Cesium levels in fish near Fukushima still unsafe

New York Times : Although radiation levels in the waters off the Japanese coast near Fukushima have been determined to be safe, about 40% of the fish tested have high levels of radioactive cesium. The highest levels were seen in bottom-feeding fish, which suggests that the fish are being contaminated by cesium on the sea bed. The detected cesium isotopes have a half-life of 30 years, which means that sediments on the sea floor could be contaminated for the next several decades. Japan is continuing to ban the sale of 36 species of fish from the area, though small-scale fishing has resumed for a few species that have been cleared by the government. Yoshikazu Nagai, a spokesman for the Tokyo Electric Power Company, says that the company is building a wall between the power plant site and the coastline to help prevent any undetected leaks from spreading more radiation.