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Toxic algal bloom cuts cuttlefish numbers 97% in SA

8/30/2026

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Story summary
  • South Australian Department of Environment and Water reported 1,811 cuttlefish at Cuttlefish Coast, a 97% decline from 63,000.
  • The department attributes the collapse to a toxic algal bloom that has persisted for over 18 months.
  • Divers led by 28-year-old diver Manny Katz found only about 440 eggs along eight kilometres of reef, versus millions.
  • Co-founder Stefan Andrews urges listing the Australian cuttlefish as threatened because adults are still laying eggs.