New CRCNA-supported research is highlighting the critical role aquatic vegetation plays in supporting freshwater species across northern Australia.

Led by student researcher Mitchell Heide through the CRCNA Water Security for Northern Australia program’s Gilbert Catchment node, the study, published in Ecology and Evolution, examines how red claw crayfish select habitat during early life stages.

The findings show a clear preference for vegetated environments, particularly among juveniles, which selected vegetation up to 60% more often when given a choice.

“Vegetated habitats provide essential refuge at the most vulnerable life stages, and without them survival rates are likely to decline,” Mitchell Heide said.

Craylings also showed a consistent preference for vegetation, while simpler habitats such as sand and gravel were used less when alternatives were available, indicating active habitat selection rather than chance.

The research has important implications for river systems across northern Australia, where seasonal drying concentrates aquatic life into shrinking waterholes.

“As rivers contract through the dry season, these vegetated areas become critical safe havens for species under pressure,” Mr Heide said.

CRCNA CEO Anthony Curro said the research reinforces the importance of understanding how water systems function to support sustainable development.

“This is exactly the kind of applied research we need in northern Australia, work that connects ecological knowledge with practical outcomes for managing water, supporting industry and protecting our natural assets,” Mr Curro said.

The study highlights that loss or degradation of aquatic vegetation, through changes in water quality, flow or land use, could directly impact recruitment and long-term population health.

This research contributes to the CRCNA’s broader Water Security for Northern Australia program, supporting better decision-making to balance development and environmental resilience across the north.

Visit the Cooperative Research Centre for Developing Northern Australia (CRCNA) for more information –https://crcna.com.au/resources/publications/student-paper-size%E2%80%90dependent-habitat-selection-in-a-tropical-freshwater-crayfish-preference/