A health check of the Vasse River has revealed its significant ecological value with a system rich in native fish and crayfish.
Department of Water and Environmental Regulation scientists compared three sites as part of the Healthy Rivers program.
The findings, which included data on water quality, vegetation, fish and crayfish and macro-invertebrates (waterbugs), were presented to around 50 community members at a science seminar hosted by GeoCatch in Busselton.
Environmental officer Bronwyn Rennie said it was pleasing to see the high quantities of native species across all sites, with comparatively low numbers of exotic fish.
"Vasse River provides refuge to a variety of native species including Carter's freshwater mussel, marron, gilgies, nightfish, western minnow, western hardyhead, western pygmy-perch and blue-spot goby," she said.
"The Upper Vasse site was a great example of landholders implementing best practice by fencing off the river and protecting it from livestock.
"This has allowed the native vegetation to grow back, as well as protecting the river bank and instream habitat."
Ms Rennie was also encouraged to see the Lower Vasse River maintain high ecological values despite poorer water quality and one site covered with water lilies.
"Monitoring river health allows us to identify key ecosystem features and threats, so we can target efforts to protect and improve waterway health and water quality," she said.
The intention is to repeat the ecological monitoring every few years so scientists can track the river's condition and ensure sustainability into the future, particularly in response to a changing climate and increasing population.
The Vasse River health study is an initiative of the Revitalising Geographe Waterways program supported by the State Government's Regional Estuaries Initiative.
A copy of the Vasse River field summary of river condition can be found at rgw.dwer.wa.gov.au.
