Officials in the island state are attempting to pinpoint a rosy sludge that has materialized on a secluded beach, with some scientists anxious it could be an phytoplankton proliferation.
The magenta-hued slime materialized across a stretch of a coastal area about 60km south of Hobart. A similar sludge has also been recorded on sections of another local beach and Little Taylors Bay.
Specimens have been collected and sent to the environmental agency for examination. A representative commented that "algal blooms are a normal phenomenon in reaction to variations in nutrients, warmth, rainfall or light".
"They are sometimes called crimson or rosy tides because the proliferations can color the water red," the representative noted. "Only some algal blooms are harmful, with many species serving as a primary source of nourishment for marine life in the marine food web."
"The most common cause of reddish water in Tasmanian waters is the oceanic algae Noctiluca scintillans, which can produce bioluminescent light displays at night."
Algae outbreaks are natural events but their rate has risen in recent times, partly due to global warming and pollution that combine to create food-loaded oceans geared for the fast proliferation of dinoflagellates.
Dinoflagellates are a phytoplankton species that typically function as the ocean's detritus consumers. During a proliferation, there is a quick expansion in their numbers that disturbs the normal functioning of ecosystems.
These phenomena have been compared to underwater bushfires and can continue to grow as long as conditions are ripe. In more extreme scenarios, delicate ocean habitats can be devastated as marine life is eliminated or suffocated, providing more food for the proliferation.
Another region not long ago grappled with a devastating algae outbreak along its southern coastline after a string of sea temperature spikes, which extended across a vast area. The event resulted in beachgoers with irritated eyes and hacking coughs and may have eliminated up to 250,000 marine animals across hundreds of species, according to official estimates.
Faith Coleman, who assisted in examining the start of South Australia's outbreak said, based on images of the current situation, the probable type involved was Noctiluca scintillans, a form of dinoflagellate also known as "marine shimmer".
"There have been numerous of these blooms around the island of late," she said.
Coleman stated sea sparkle did not generate poisons comparable to the type involved in that devastating algal bloom, but it does consume small invertebrates and "numerous fish eggs", meaning aquatic creatures were particularly vulnerable.
"It's common to observe a proliferation of this algae after a outbreak of another organism, or for example a marine breeding," she added.
Lilly Henley, who took samples of the magenta ooze in Tasmania, said it appeared the suspected bloom had "increased notably" and proposed the fish farming business was the probable cause, pointing to comparable events overseas.
"Thus Tasmania needs to deliver a strong warning here, the officials and the regulators need to act to this. We need to examine the specimens we've gathered and we need to inform the people here," she said.
Henley stated she had concerns for community health after experiencing a numbness along her limbs and skin while being sprayed with affected seawater.
An advocacy organization has stated dead octopus and expired organisms appearing on the coast, with a longtime environmental campaigner describing the situation as an "ecological crisis" and calling on the government head to inspect and "lead the reaction that authorities must be making".
"He needs to know this is a catastrophe in the making, economically as well as environmentally."
Talking with journalists, the leader commented he was not aware of any relationships between the algae outbreak and the salmon industry, saying scientific testing was needed before judgments could be drawn.
"It is vital to guarantee our waterways are environmentally safe and long-lasting," he remarked.
"The 1,200 beaches across the state are our treasures and we need to guarantee the public and our business sector can coexist to use our waterways effectively and responsibly."
Astrophysicist and space technology consultant with 15 years of experience in lunar mission planning and research.
