Department of Natural Resources and Environment Tasmania (NRE Tas) laboratory testing has confirmed the recent 'algal bloom' observed in the waters of southern Tasmania is
Noctiluca scintillans.
Noctiluca scintillans, a dinoflagellate, may cause a change in colour to red or pink, along water surfaces in some coastal areas. At night this species can create dramatic bioluminescent light, or sea sparkle displays, keenly observed by many.
Noctiluca scintillans occurs naturally in Tasmania, and around the world, and is a part of the marine ecosystem, providing a source of food for some marine species.
This species is different to
Karenia cristata, the cause of the harmful algal bloom in South Australia.
There is no known link between Tasmanian aquaculture and an increase of
Noctiluca scintillans events.
It is not unusual for blooms to be present at this time of year, and the public may be treated to bioluminescent displays if they are on our beaches at night.
As this is such a regular natural occurrence, NRE Tas does not routinely undertake testing, but has done so to provide public reassurance given the attention being drawn to this particular site.
NRE Tas monitors for harmful algal blooms and has not detected anything of concern. The ShellMAP program continues to ensure Tasmanian produced shellfish meets the highest standards for safety including by monitoring for biotoxin-producing algae.
Read more about
algal blooms in Tasmania.
Noctiluca bloom Binalong Bay 2025
Photo: Kellie Morris