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Between 1970s and 1990s, coastal eutrophication was intensified along with the economic development of each state, which led to occurrences of HABs quite often and a large economic impact on fisheries. In recent years, improving trend of eutrophication was shown; however, HAB occurrences were reported, so was a serious damage on fisheries once in a while.

Since its inception, NOWPAP CEARAC has implemented various activities on degraded marine and coastal environment due to harmful algal blooms (HABs) including red tides and shellfish poisoning, as part of assessment of the marine and coastal environment. It is important and useful to share information on HAB occurrences and damages by HABs in each state to help develop and implement measures on prevention from and reduction of HABs. CEARAC developed the HAB Integrated Website to disseminate HAB-related information in the NOWPAP region.