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China sent a survey ship and taking seawater samples off the coast of Fukushima back in June and July. The State Oceanic Administration now says the contamination of the Pacific Ocean may extend as far as 800 kilometers (497 miles) off the coast of Fukushima, as reported by the Science and Technology Daily (ST Daily) in China, according to Asahi Shinbun.
(STDaily's original article in Chinese is here.)
From Asahi Shinbun (12:08PM JST 8/16/2011):
中国国家海洋局は、福島県沖の西太平洋で行った海洋環境調査の結果として「（放射性物質に）汚染された海域は日本が発表した影響範囲をはるかに超えている。放射性汚染物質が中国の管轄海域に入っている可能性も排除できない」との見解を明らかにした。
China's State Oceanic Administration cites the result of the environmental survey it did in the western Pacific Ocean off the coast of Fukushima and says a much wider area of the Pacific Ocean is contaminated with radioactive materials than the Japanese government has announced, and that the possibility cannot be eliminated that radioactive materials have entered the ocean under the Chinese control".
中国紙、科技日報（電子版）が１５日、同紙の取材に対する同海洋局の書面回答の内容として伝えた。
The Chinese paper "Science and Technology Daily (electronic version)" reported on August 15 as the State Oceanic Administration's written response to their inquiry.
これによると、放射性物質の影響を受けているとされたのは、福島県沖東８００キロ以内の２５．２万平方キロの海域。中国近海に比べてセシウム１３７が最高３００倍、ストロンチウム９０が最高１０倍の濃度で、それぞれ検出されたという。
According to the State Oceanic Administration, the area said to be affected by radioactive materials is a 252,000 square-kilometer [corrected] area inside the 800 kilometer off the coast of Fukushima. Cesium-137 was found maximum 300 times the level found in the Chinese coastal waters, and strontium-90 was found maximum 10 times the level.
同海洋局は福島第一原発事故を受け、６月から７月にかけ、海洋調査船を宮城県沖などの西太平洋に派遣し、調査を行っていた。
The State Oceanic Administration conducted the survey in June and July in the Western Pacific, in response to the Fukushima I Nuclear Power Plant accident.
In a separate piece of news, 5,000 angry residents of Chengdu in Sichuan Province in China closed off the roads [to the city?] to protest the frequent power outage, according to Yomiuri Shinbun citing Hong Kong's Oriental Daily.