A striking bioluminescent bloom illuminating the southeast coastline of Tasmania has once again captured public attention, with scientists confirming that climate change—not fish-farm pollution—is the driving force behind the phenomenon. The event, marked by red tides during the day and glowing blue waters at night, has reappeared nearly a year after a similar occurrence, prompting renewed scientific scrutiny.

The glow is caused by Noctiluca scintillans, a bioluminescent marine plankton that feeds on microscopic algae. When the organism dies, it rises to the surface, forming red slicks that emit an electric-blue light when disturbed. While the spectacle has drawn crowds to southern Tasmanian beaches, authorities have advised the public to avoid swimming in affected areas.

Marine biologist Lisa-ann Gershwin explained that despite its beauty, the bloom can release ammonia, leading to skin irritation in humans and oxygen depletion in surrounding waters. This drop in oxygen levels can result in the deaths of fish and other marine life, making the phenomenon a warning sign of broader ecological imbalance.

Also Read: India’s Himalayan Region Needs $102 Billion a Year to Combat Climate Change: ICIMOD

Scientists have attributed the bloom to warming ocean temperatures linked to climate change, particularly the strengthening East Australian Current. Gershwin noted that these warmer conditions favour Noctiluca growth and could also enable more dangerous algal blooms to emerge in the future, similar to toxic outbreaks previously seen in South Australia.

Emeritus Professor Gustaaf Hallegraeff from the University of Tasmania rejected claims that salmon farming waste caused the bloom. He said the organism thrives on natural deep-sea nutrients and does not rely on ammonia or urea associated with fish farms. However, he acknowledged that such blooms can still disrupt aquaculture operations by altering fish behaviour.

While experts stress that Noctiluca scintillans poses minimal long-term risk at present, they warn that its increasing frequency highlights the growing impact of climate change on marine ecosystems. Scientists continue to monitor the situation closely, viewing the glowing waters as both a natural wonder and a signal of changing ocean conditions.

Also Read: Delhi Teen Beaten to Death by Juveniles: Six Apprehended in Trilokpuri Case