Australian Bass

Interesting Info

• The Australian Bass is a prized native freshwater fish found in coastal rivers and streams of eastern Australia, from Bundaberg in Queensland down to Wilsons Promontory in Victoria.
• Their body is deep and streamlined, coloured dark olive to silver-grey on the back fading to a pale belly, with a slightly forked tail built for speed.
• Australian Bass are mainly freshwater residents, but they are catadromous — meaning they migrate to estuaries and coastal waters to spawn during winter (June–August).
• Australian Bass are well adapted to rivers with rocky pools, snags, and shaded banks, often lurking near structure to ambush prey.
• They feed on a wide variety of prey: juveniles eat insect larvae and shrimp, while adults are powerful predators of fish, prawns, crabs, and surface insects.
• Breeding is triggered by cooler temperatures and increased flows from rainfall, which draw adults downstream. Spawning occurs in estuarine waters, where females release eggs and males fertilise them in the water column.
• A large female can release 300,000–1.5 million eggs per season, ensuring high survival despite predation on larvae.
• After hatching, larvae drift into estuarine nursery areas before juveniles migrate upstream into freshwater habitats.
• They are sometimes confused with estuary perch (Macquaria colonorum), which are close relatives but live further south and are generally more estuarine.
• They are regarded as one of Australia’s premier freshwater sportfish, famous for their aggressive strikes and powerful fights on light tackle.
• Lifespan is long for a sportfish — they can live 20 years or more, but take several years to reach maturity.