Donnelly River - Greens Island

Basin : Donnelly River

Catchment : Donnelly River

The condition of the Greens Island site (site code: DR190DONN1/6081079), in the middle catchment of the Donnelly River, has been assessed on several occasions:

  • 17-18 July 2024
  • 23-24 Feb 2026

The assessment was conducted using standard methods from the South West Index of River Condition. Measures chosen for this assessment included fish and crayfish, aquatic habitat, water quality (dissolved oxygen, temperature, electrical conductivity, and pH logged over 24h, and colour, alkalinity, turbidity and nutrients), fringing vegetation, channel morphology, erosion, connectivity, local land use and flow.

Water quality loggers were deployed for extended periods, as listed below. This enables assessment of water quality responses to changes in climate, streamflow and factors such as the intactness of vegetation within the river corridor. Longer term deployment allows detection of sub-optimal water quality conditions, which can be missed during the standard 24-hour assessment.

  • 12 December 2023 to 18 July 2024
  • 16 December 2025 to 6 May 2026

Condition summary

Please contact the River Science Branch for site information.

Fish and crayfish

Eight fish species and two crayfish species were found at this site during the assessments:

  • Bostockia porosa (Nightfish)
  • Galaxias occidentalis (Western minnow)
  • Geotria australis (Pouched lamprey, adult)*
  • Nannoperca vittata (Western pygmy perch)
  • Gambusia holbrooki (Eastern gambusia)
  • Pseudogobius olorum (Swan river goby)
  • Oncorhynchus mykiss (Rainbow trout) – non-native
  • Perca fluviatilis (Redfin perch) – non-native
  • Cherax cainii (Smooth marron)
  • Cherax preissii (Koonac)

*Pouched lamprey was observed in May 2024 during an ad-hoc site visit.

Only fish and crayfish are targeted by sampling methods. Other species that were caught and/or observed are listed below:

  • Westralunio carteri (Carter’s freshwater mussel)**
  • Palaemon australis (South-west glass shrimp)

**Carter’s freshwater mussel was observed in April 2024 during an ad-hoc site visit.

Click on the images below to learn more.

Species found in subcatchment

This includes all species found within the subcatchment of the assessment site, from this and previous studies in the area. The photos are linked to more information about each species, including maps of where they are expected across the south-west.

Explore other sites in the catchment