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Unexpected Decline of the World‑Famous Cuttlefish AggregationMid‑June is traditionally the peak of the giant Australian cuttlefish spawning event near Whyalla in South Australia’s Spencer Gulf. This year, instead of thousands, divers have recorded only a few dozen skittish individuals.The Toxic Algal Bloom’s Direct ThreatResearchers attribute the shortfall to the ongoing bloom of Karenia cristata, the largest and most destructive algal event in Australian history. The bloom, first detected in March 2025, continues to coat coastal waters with toxic cells that are “swift and fatal” to cephalopods, according to marine ecologist Zoe Doubleday.Testing Data Highlights Algal IntensityElevated levels detected at 8 of 32 monitoring sites on the southern Eyre Peninsula and southern Spencer Gulf.Highest concentration recorded: 432,899 cells per litre at Proper Bay.Government threshold for “elevated” is >10,000 cells per litre; counts above this suggest an active bloom.Economic Ripple Effects for WhyallaThe cuttlefish aggregation fuels the town’s winter celebration, “Cuttlefest”, and underpins a multimillion‑dollar tourism sector. Dive‑shop owner Manny Katz reports that the June long‑weekend bookings worth $50,000 were cancelled after the cuttlefish failed to appear, threatening local revenue and community morale.What Comes Next for the Spawning SeasonState researchers will conduct formal surveys in the coming weeks. Doubleday cautions that the next two weeks are critical for determining whether the population will recover or if the bloom will cause a longer‑term collapse. While spawning can sometimes extend into July, the current “anecdotally low” reports raise serious concerns for the future of this globally unique natural phenomenon.