In the last decade many HAB scientists noticed that BAB phenomena in Southeast Asian region were changing its nature
occurrence of new BAB species, their increased frequency, widen affected geographical area, and prolonged duration of the occurrences. Moreover variety of phenomena, i. e. new types of toxins and mortality of marine organisms, also increased In this paper, features of the problems cause by several endemic and newly invaded RAB species are described in details, together with biological and chemical characters of the organisms.