This pattern may be pale or non existent in some populations and individuals and additionally there may be body shading made up of many tiny grey spots.

Often there is a series of closely spaced oval to almost circular very dark bars along the sides, although these markings may be pale to non-existent in some populations, but when present are always more numerous, thinner, closer together and more variable in shape than in Galaxias fuscus as well as generally extending further back along the body to at least as far as the anal fin.

In addition many other members of the mountain galaxias species complex have ranges confined to the upper reaches of their respective drainages.

Additionally, Mountain galaxias is found in some low level wetlands, billabongs and on stream farm dams throughout Victoria and central to northern NSW and some upland lakes and remnant pools in drying watercourses.

Mostly found near the stream bed or taking shelter among thick macrophytes, rocks, woody debris or undercut banks.

[3] At high elevations along the Great Dividing Range, G.olidus occurs in streams that are snow covered for differing amounts of time during winter.