The Mud Minnow, or Galaxiella munda, grows to a maximum length of 58mm and has a scaleless, elongated body with a distinctive brown line down its midline.

It is listed as fauna that is rare or likely to become extinct and is believed to be sensitive to changes in the environment.

The study revealed that the rare fish was only found in areas where the stream side vegetation was intact.

“The study has shown that both the Buayanyup and Carbunup River systems contain valuable native fish and freshwater crayfish, highlighting the importance of conserving native vegetation to provide more suitable habitat for aquatic fauna,” Steve Beatty of Murdoch University said.

In addition to the rare Mud Minnow, 11 species of marine or estuarine fishes were recorded near the mouth of Buayanyup River including Black Bream, Whiting and Mullet.

Healthy populations of four of the eight endemic freshwater fish species of South Western Australia were also recorded in both the Buayanyup and Carbunup Rivers.

The introduced Eastern Gambusia (mosquito-fish) was also recorded in the modified lower reaches.

The Black Bream was one of seven species of estuarine marine fish recorded at the mouth of the Carbunup River.

Blue swimmer crabs were also found to use the lower section.

A survey of crustaceans recorded six types of decapod crustaceans in the Buayanyup River and four in the Carbunup River.

These included the freshwater crayfish; the native Smooth Marron, Koonac, Gilgie and the introduced Yabbie.

There are many landholders in the catchments that are helping to manage the waterways by maintaining vegetation and revegetating.

GeoCatch encourages the local community to become involved in activities that continue to protect and enhance these waterways and the fauna that inhabits them.

For more information on the funding and assistance available through GeoCatch’s Rivercare Project contact Gemma Mincherton on 9781 0111.