The Macquarie Perch (Macquaria australasica) is a native Australian fish species found in Victoria, primarily in the cool, upper reaches of the state’s tributaries of the Murray-Darling system. This species is known for its distinctive appearance, with a tapered snout, dark silvery-grey to green-brown coloration, and lighter sides and belly. Macquarie perch prefer deep riverine habitats and are often found in areas with rock or gravel substrates, which are essential for their spawning. Unfortunately, their populations have significantly declined due to habitat destruction, changes in river flow and temperature, and the impact of introduced species.
Breeding occurs in late spring when water temperatures reach 15 to 16°C. Macquarie perch spawn in flowing water over unsilted cobble and gravel substrates. The demersal (sinking) eggs fall into the spaces between the gravel and cobble, where they are protected and incubated until hatching. This breeding strategy is crucial for the survival of their offspring, as it provides a safe environment for the eggs to develop.
Conservation efforts are underway to protect and recover the Macquarie Perch in Victoria. These efforts include habitat restoration, monitoring of populations, and restrictions on fishing to prevent further decline. The species is classified as “endangered” under both state and federal conservation laws, highlighting the urgent need for continued action.
Additionally, genomic research has played a crucial role in improving conservation strategies by enhancing genetic diversity among populations, which is vital for the species’ long-term survival. These efforts demonstrate that with dedicated management and community support, the future of the Macquarie Perch can be secured.