The Southern Pygmy Perch is a small fish (maximum size 85 mm; usually less than 65 mm).


Southern Pygmy Perch persist in streams with good aquatic vegetation cover and water quality.



The males develop a bright red fin during the breeding season and they are often confused with baby redfin and the mosquito fish.


It is a threatened species in NSW and has only been recorded from a handful of sites in the last 25 years. New populations are occasionally discovered, most recently in the Lachlan drainage north of Yass. In NSW only two other populations are currently known, from near Holbrook and Albury.

It is believed that the decline in this species could be in part by the predation of alien species, e.g. Redfin perch, trout and Eastern gambusia. Habitat alteration such as loss of aquatic vegetation, floodplain alienation, cold-water pollution and seasonal flow changes/reductions is also likely to be involved.

Life expectancy