The phenomenon, known as "sea sparkles" or "red tide", was caused by masses of Noctiluca scintillans, a pink-coloured algae that experts say is beautiful to look at, but considered bad news for the environment.
Dr Lisa-ann Gershwin, a scientist and writer who runs tours of Tasmania's naturally glowing flora and fauna, said the current algal bloom throughout Storm Bay, south-east of Hobart, was on a "truly epic" scale.
The algae was "putting on a heck of a light show", she said. What looked like a "pink slick" during the day emitted a "mesmerising sparkle" after dark, turning the arc of each wavelet a luminous blue that stretched as far as the eye could see.
She said it was a "spiritual experience to see something so awe-inspiring".
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