Not evaluated (IUCN 3.1)
It is very similar to and very closely related to its sister species the Australian bass, Percalates novemaculeata, differing in having a slightly more "scooped" forehead and reaching a larger length of 75 centimetres (30 in) SL. Most individuals only reach around 40 centimetres (16 in). The greatest recorded weight for a specimen of this species is 10 kilograms (22 lb).
Estuary perch breed in winter at the same time as Australian bass, and are similarly sexually dimorphic with females larger than males. Female estuary perch reach sexual maturity at older, larger sizes than males. In Victoria, estuary perch/Australian bass hybrids are regularly recorded; most hybrids appear to be reproductively viable.
Estuary perch, as also many other native fish of southeast Australia, are very long-lived. Longevity is a survival strategy to ensure that most adults participate in at least one exceptional spawning and recruitment event, which are often linked to unusually wet La Niña years and may only occur every one or two decades. Maximum recorded age is 36 years.
- "Macquaria colonorum". Integrated Taxonomic Information System. Retrieved 11 March 2006.
- Froese, Rainer and Pauly, Daniel, eds. (2005). "Macquaria colonorum" in FishBase. 10 2005 version.
- Native Fish Australia: Estuary Perch www.nativefish.asn.au