New research has revealed concerning trends in the abundance of the eastern blue groper, an iconic species of the Great Southern Reef. While populations remain relatively stable on deeper reefs (20–40m), significant declines have been recorded on shallower reefs (5–10m), particularly in the Manning and Hawkesbury Bioregions.
This pattern suggests that deeper reefs may act as climate refuges, buffering populations from rising ocean temperatures. Similar declines in other temperate wrasse species reinforce the broader impacts of climate change on reef fish communities. These findings align with patterns seen in golden kelp, which is also retreating to deeper waters in response to warming. Similar declines have also been observed in WA with the western blue groper.
Additionally, the study highlights potential human pressures in heavily populated areas, such as Sydney, where fish numbers are lower than expected. These findings support the recent trial prohibition on fishing for blue gropers in NSW, reinforcing the need for ongoing monitoring and adaptive management to protect this species as our oceans continue to change.
News Source: Great Southern Reef Foundation