Testing fish for radiation

I just saw on the news today that the Japanese government will be increasing it's testing of sea food for high radiation levels. The testing locations will be increased from what it is at now (about 45) to over a hundred points ranging from where we live in Kanagawa prefecture all the way up the northern coast of Japan. The tests will be done once per week. If high levels are found, the fisheries will be not be able to harvest any fish until the readings have dropped to a safe level for three consecutive weeks. The results of these tests will be available to the public so other countries will be reassured of Japanese sea food.