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The blue tide began to occur every year after 2002 in the head of Osaka Bay. It is important to investigate an occurrence of the blue tide in the field. Therefore occurrences of the blue tide and these range were confirmed by visual observation and hearing investigation after 2005. In a result, occurrences of the blue tide counted up to 11. While, temporal and spatial variations of water temperature, salinity and DO were simultaneously investigated to clarify the mechanism of the blue tide. The analysis of observed seawater suggested that an occurrence and a range of the blue tide were closely related to a stratified intensity defined as a vertical gradient of density of seawater and oxygen depression.

A Study on the Occurrence and the Range of the Blue Tide in the Head of Osaka Bay Based on Field Observations