Description

Dorsal soft rays (total): 7 - 11; Anal soft rays: 9 - 14; Vertebrae: 50 - 56. This species is distinguished from is congeners within the Galaxias olidus complex by the following characters: trunk usually laterally compressed posteriorly from about above the pelvic fin base; caudal fin emarginate to weakly forked; often 12 segmented rays in anal fin (range 9-14), always more than in the dorsal fin, which usually has about 9 segmented rays; anal fin base length long (9.8-14.1 % SL) and that of dorsal fin short (7.4-10.8 % SL), anal fin long (14.3-19.7 % SL); caudal peduncle somewhat shallow (6.5-9.0 % SL); pelvic fins moderately large, about 91 % of length of pectoral fins; lateral profile of head is slightly to moderately wedge-shaped and snout rounded; inter-orbital wide (36.0-46.4 % HL) and eye moderately large (16.4-23.9 % HL); nostrils are moderate in length, usually not visible from ventral view; anterior tip of upper lip level with about 0.6 eye diameter above ventral margin of eye; raised lamellae usually absent from ventral surface of rays of paired fins, very occasionally present but weakly developed; anal fin origin usually under 0.47 distance posteriorly along dorsal fin base, often much less; usually with a single, short (1.2 % SL) pyloric caecum, but mostly absent; gill rakers variable, of moderate length to long and stout to thin; distinct body pattern, particularly on the sides, gill cover often with a large turquoise or gold patch and belly often distinctly silvery or white; the distinct black bars along lateral line are usually absent, although occasionally some individuals with darker mid-lateral dark brownish blotches between the pectoral and pelvic fin bases, or a single, to a series of, very narrow and short faint brown to greyish dark brown mid-lateral bars anteriorly behind the pectoral fin base (Ref. 98815).

Common Names

No common names available.

Taxonomic Hierarchy

Kingdom: Animalia

Phylum: Chordata

Class: Teleostei

Order: Galaxiiformes

Family: Galaxiidae

Genus: Galaxias

Species: Galaxias oliros Raadik, 2014

Climate Zone

Location

Biology

Facultative air-breathing in the genus (Ref. 126274); A freshwater fish that is unable to undertake diadromous migrations. Generally found at low to moderate elevations (lowland to foothill reaches) in different stream types, ranging from slower-flowing, clear to turbid, medium to larger rivers (4-20 m average width), gently or moderately fast flowing smaller creeks (0.5-4.0 m average width), also in anabranches, billabongs and some wetlands, including disconnected pools in drying water courses. It is recorded from shallow riffle areas along the edge of pools as juveniles, to deeper (0.1- >1.2 m average depth), more open water habitats in pools as adults, although also usually in glides. Often found among dense aquatic vegetation and timber debris, occasionally in the open in midwater or just under the surface. Recorded often at densities up to 0.7-1.6 fish/m2, but can be very abundant in swamps, billabongs and isolated pools (up to 8.0 fish/m2). Collected with a diverse range of fish and decapod crustacea, commonly with Galaxias olidus, Galaxias arcanus, Gadopsis marmoratus (River blackfish), Nannoperca australis (Southern Pygmy Perch), Retropinna sp. (Australian Smelt), Philypnodon grandiceps (Flatheaded Gudgeon), Common Freshwater Shrimp and Common Yabby. It appears to have high physico-chemical tolerance as recorded from isolated pools with high water turbidity or salinity levels (e.g. Wimmera and Glenelg river systems), or stagnant, refuge pools with high loads of dissolved organic carbon from leachates of Eucalyptus leaves (e.g. Marne River) and upper Avoca River system. It has been found to be infected with the parasitic copepod Lernaea cyprinoides, and can be lightly to heavily infected with small grey to black cysts, possibly trematode metacercariae, embedded in the skin of the head or trunk, or in the fins. A small number of fish were recorded with a short, thin, white worm, coiled and pointed at both ends, from amongst fat deposits around the stomach in the body cavity, others with small ulcers on the body. Deformities recorded of fins (dorsal, pectoral, and pelvic), jaws and posterior margin of the gill cover, and some with curvature of the spine (Ref. 98815).

Habitat

benthopelagic