Karenia brevis, a naturally-occurring organism seen as far back as the 15th C. The algae is not particularly villainous until it has a population explosion. That's recently happened in these parts, and it's asphyxiating fish in vast quantities. My sunset walk on the beach night before last? Not so pretty. Dead fish on the shore as far as the eye can see. Which I did not photograph. There's a limit to my need to document, though not to my imagination. Something about this episode may find its way into my work, although I may not recognize it by the time it happens.