A plan by Tepco to release water containing traces of radioactive materials from the Fukushima No. 2 nuclear power plant into the Pacific has been halted by stiff opposition from the Fisheries Agency, sources said Wednesday.

Although Tokyo Electric Power Co. told the agency it would release the water after removing radioactive substances to an undetectable level, the agency is not approving the plan, leaving the fate of the 3,000 tons of water accumulated in the nuclear power station, located 15 km south of the crippled Fukushima No. 1 plant, undecided.

If the water remains in tanks for a prolonged time, the storage facility may be corroded by salt in the water.