Tokyo: Environmental activist group Greenpeace warned on Thursday that marine life it tested more than 20 kilometres (12 miles) off Japan`s stricken Fukushima nuclear plant showed radiation above legal limits.
The anti-nuclear group, which conducted the coastal and offshore tests this month, criticised Japanese authorities for their "continued inadequate response to the Fukushima nuclear crisis" sparked by the March 11 quake and tsunami.
Greenpeace said it detected seaweed radiation levels 50 times higher than official limits, which it charged raised "serious concerns about continued long-term risks to people and the environment from contaminated seawater".
It also said that tests, which it said were independently verified by French and Belgian laboratories, showed above-legal levels of radioactive iodine-131 and caesium-137 in several species of fish and shellfish.
"Our data show that significant amounts of contamination continue to spread over great distances from the Fukushima nuclear plant," said Jan Vande Putte, a Greenpeace radiation expert, at a Tokyo press conference.
Japan has said ocean currents and tides are rapidly diluting contaminants from the tsunami-hit atomic plant, and Fukushima prefecture told a news agency on Thursday that no fishing is going on at the moment in its waters.
"We have exercised self-restraint as (prefectural) safety tests have not been conducted yet," said a Fukushima official. "We will make a decision after confirming the results of the tests, which will take place shortly."
The official added: "People do not bother fishing now. If you caught fish or other marine products in waters near the plant, they wouldn`t sell."
Japan`s fisheries agencies, and neighbouring prefectures, have been checking marine products at different spots, and the government has prohibited fishermen from catching some species found to have elevated radiation levels.