Pirsa - some results form Sardis catch and release
•King George Whiting: Evidence of recent declines with widespread indication of post-settlement failure.
King George Whiting surveys were undertaken across GSV and SG in 2025. Across the 18 locations sampled, post-settled King George Whiting densities were at their lowest levels on record, with declines of 37-97% since the most recent survey in 2017. The greatest reductions occurred in Lower Eyre Peninsula, Northern GSV and Southern GSV, while Southern SG was the only region to show an increase.
•Southern Calamari
Decline 50-80%
Five fishery-independent diver surveys of Southern Calamari egg masses have been completed to date: four in GSV and one in SG. In GSV, no eggs were observed at either location during October to December 2025 surveys, compared with the ~7,000-10,500 eggs recorded each month in 2005-06. In SG, first-time surveys across four exploratory sites recorded four small egg masses (154 strands) in clear water with normal fauna, suggesting low Southern Calamari abundance rather than localised effects of the algal bloom.
Southern Garfish: Severely affected with additional evidence of egg mass and juvenile declines
87% effected
•Western King Prawn: Strong evidence from scientific surveys of low catches and very little bycatch. 72% decline GSV
•Blue Swimmer Crab: Catches are very low, well below historical levels.
Abalone: High mortality observed in parts of the gulf. ( this will have changed now with Spencer’s bloom event )
Fishery-independent dive surveys were undertaken to the West (Corny Point, Hardwicke Bay, Port Victoria and Tiparra Reef) and East (Stansbury and Edithburgh) of Yorke Peninsula between August and November 2025.
The surveys at Corny Point and Tiparra Reef had the highest number of legal sized Greenlip Abalone since surveys began in 2015 and 1990, respectively. For Hardwicke Bay, counts of both legal- and sub-legal-sized Greenlip Abalone were higher in 2025 than the most recent survey in 2023, and similar to counts from surveys in 2019 and 2021. At Port Victoria, counts of Greenlip Abalone were similar to those recorded in the previous 2023 survey. From the 11 transects completed at Tiparra Reef, counts were the highest on record. Consequently, there was no evidence of algal bloom impacts on Greenlip Abalone in SG.
In contrast, at all sites surveyed by divers at Stansbury and Edithburgh, there was evidence that the algal bloom has impacted abalone in GSV. At Stansbury, divers observed unwell, dying or dead abalone of all
three species (Haliotis laevigata, H. scalaris, H. cyclobates). Samples of these three species (n = 10) were
collected and tested for Abalone Viral Ganglioneuritis (AVG), with all tests returning a negative result.
Some live abalone were observed at this location, and abundance varied among sites (Mean 1.075 Greenlip Abalone/min). There are no previous surveys for temporal comparison but estimates from all four dive sites suggested 70% to 90% of Greenlip Abalone were unwell or dead, and almost all other abalone species were dead. At Edithburgh, there was also evidence of impact from the algal bloom, but these appeared to be less severe than those observed at Stansbury. Overall, however, there was strong evidence of algal bloom impacts on Greenlip Abalone
Also hatchlings of port Jackson sharks have been found dead on the bottom by diver Jeff Bradley - Spencer gulf
😩😢
@GLH_books ( thanks Gen )
pir.sa.gov.au/__data/assets/…
Photo
from Jeff Bradly; diver