A block of red tide is seen in waters near Rizhao, a city of east China's Shandong Province, May 7, 2012. Five blocks of red tide have been detected in waters near Rizhao, according to a notice issued Saturday by the State Oceanic Administration (SOA). The SOA said the red tide was caused by a bloom of Noctiluca scintillan, a species of algae. The SOA will use satellite remote-sensing technology, patrol vessels and helicopters to monitor any changes in the red tide. [Xinhua]

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