Western MinnowGalaxias occidentalis

This is one species of native fish that is usually easy to spot if it is present. Minnows are slender, torpedo-shaped fish, usually around 100 mm in length, although they can grow up to 200 mm.

Their colour ranges from olive green to light brown, with a series of darker bars on the upper sides.

Western minnows are active, fast swimming fish. They are often seen in shoals, swimming just above the bottom. They like well-oxygenated water are often found in fast-flowing streams near rapids and waterfalls. They eat small crustaceans and terrestrial insects that fall into the water.

Western minnows are widespread and reasonably common, although they have largely disappeared from the upper reaches of salinized rivers.

Video: Fish Health Unit, Murdoch.