Inspector Qu Xuanzhang of Beihai Branch of the State Oceanic Administration (SOA) takes samples of red tide 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 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/Li Ziheng)