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Heterosigma akashiwo syn Olisthodiscus carterae, Entomosigma akashiwo, Heterosigma carterae

These cornflake shaped cells are small, less than 25µm. There are two flagella basically equal in length, and the golden brown chloroplasts on the cell periphery give it the lumpy appearance.They are fast swimmers and will change directions quickly. Occasionally form large blooms during mid-summer to fall when water temperatures are above 15C. They are toxic to fish. H. akashiwo has been mis-identified as Olisthodiscus luteus. (Horner, Tomas)

Cape Cod