Tasmania's coastline glows in the dark as plankton turn blue

Eerie scenes on north-west coast show bioluminescent waters from 'sea sparkle'

The waters along Tasmania's north-west coastline have taken on a bizarre, glowing appearance in recent days. Photographs taken off Preservation Bay and Rocky Cape showcase bioluminescent waters caused by a natural phenomenon known as noctiluca scintillans (AKA sea sparkle), which happens when tiny plankton emit blue light in self-defence.

The phenomenon, which is best seen in calm, warm seas, is foreboding. "The displays are a sign of climate change," Anthony Richardson, from the CSIRO, told New Scientist after an occurrence in Tasmania in 2015.