It's a microscopic single cell organism, known by the scientific name Karenia Mikimotoi.

And right now this micro-algae is wreaking havoc on a large stretch of the South Australian coast, forming a destructive algal bloom that's grown to 4,500klms in size - or about twice the size of the ACT.

GUEST:

Professor Shauna Murray Marine Biologist, at the UTS School of Life Sciences.