The water off South Australia is healthier than it has been in months, yet some of the state's best-loved fish remain off the table. As the Karenia algal bloom that wrecked SA waters through late 2025 fades, managers are keeping key fisheries closed until they are confident stocks can take the pressure.
Southern calamari are under a total closure across Gulf St Vincent and Spencer Gulf, covering commercial, recreational and charter fishers. In Gulf St Vincent, garfish are also closed to recreational and charter anglers, on top of an existing commercial closure. King George whiting, meanwhile, are in their spawning closure across both gulfs until July 31.
The backdrop is a bloom in steady retreat. At its worst in December 2025, dead marine life was washing ashore at around 9,400 kilograms a week. By late autumn that had fallen to under 50 kilograms a week, with only Bickers Island, off the south-east Eyre Peninsula, still showing elevated Karenia at 16,490 cells per litre. With the threat easing, the state has dialled monitoring back to monthly testing in areas no longer in active bloom.
Scientists, though, are not ready to celebrate. Professor Mike Steer of the South Australian Research and Development Institute (SARDI) said "the job is not done," and that "we need to be vigilant in terms of our monitoring."
The government has pointed to the sustained fall in Karenia as a sign the worst is behind it, while the Opposition has stressed the toxic algae has not left SA waters entirely. That gap — between improving numbers and the danger of reopening too early — is shaping every call managers now make.
Blooms like Karenia can suffocate the water and poison fish and invertebrates, tearing through the food web that recreational species rely on. Closing fisheries to calamari, garfish and whiting buys those stocks time to spawn and recover, in the same way a seasonal shutdown protects fish in a healthier system.
For anglers, it is a frustrating sort of good news. The devastating daily wash-ups have all but ended, but several marquee species are still out of reach and will stay that way until managers are satisfied. In South Australia right now, patience is the cost of a recovery that is clearly under way — but, as the scientists put it, not yet finished.
