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Pyrodinium bahamense
Pyrodinium bahamense is a tropical species of dinoflagellates that is found primarily in Atlantic Ocean waters. It prefers salinity around 20 psu and blooms when there are large amounts of nitrogen in the water. The dinoflagellate glows bright blue when agitated by motion. Furthermore, even though this plankton species is beautiful to look at, it causes seafood toxicity.
Photo credit: https://alchetron.com/Pyrodinium-bahamense
https://wonderchews.com/bodies-of-light/