Stocky Galaxias, Galaxias tantangara Raadik 2014


Other Names: Stocky Mountain Galaxias

Stocky Galaxias, Galaxias tantangara. Source: Tarmo A. Raadik / Arthur Rylah Institute. License: All rights reserved

Summary:
A stocky, deep-bodied olive-brown galaxias becoming paler below, with many dark spots and flecks forming irregular blotches on the head, back, sides and caudal peduncle, a golden iris and translucent dusky-grey fins.
The Stocky Galaxias has a long.based anal fin, short nostrils and the upper jaw slightly overhangs the lower jaw.
This critically endangered species is known only from the type locality: a single stretch of Tantangara Creek, upstream of Tantangara Reservoir, in Kosciuszko National Park, New South Wales.

Cite this page as:
Bray, D.J. 2020, Galaxias tantangara in Fishes of Australia, accessed 29 May 2020, http://136.154.202.208/Home/species/5131

Stocky Galaxias, Galaxias tantangara Raadik 2014

More Info


Distribution

Restricted to the headwaters of Tantangara Creek, upstream of Tantangara Reservoir, in the very upper part of the  Murrumbidgee River system, Kosciuszko National Park, New South Wales. The species only occurs in a 3-4 km section above a waterfall, and predatory Brown Trout, Salmo trutta, are found immediately below the waterfall which creates a natural barrier.
The habitat is a small, cold, clear and fast flowing alpine creek, flowing through an open forest of eucalypts, low shrubs and tussock grass. The stream substrate is bedrock, boulder, and cobble, with smaller amounts of pebble and gravel, and is often snow-covered during winter months.

Features

Differs from other species within the Galaxias olidus complex in having the following combination of characters: low mean total gill raker count of 10; body distinctly stocky and deep through vent and pectoral fin base (14.1 and 16.6 % SL); caudal peduncle deep (9.0 % SL); head obtuse to slightly bulbous in lateral profile, moderately deep (44.7 % HL) but wide (68.3 % HL); gape wide (44.7 % HL and 65.4 % HW); eye profiles usually not visible laterally from ventral view; nostrils short, not visible from ventral view; caudal fin weakly emarginate to truncate, about as long or slightly longer than caudal peduncle, vertical width of expanded rays usually equal to body depth through pectoral fin base; caudal peduncle flanges long, reaching more than half distance to anal fin base; anal fin long (16.3 % SL); most posterior extent of mouth 0.8 ED below ventral margin of eye; dorsal midline usually flattened anteriorly from above or slightly posterior to pectoral fin bases; raised lamellae absent from ventral surface of rays of paired fins; anal fin origin usually under 0.73 distance posteriorly along dorsal fin base; usually 2, occasionally 1, relatively thin and long (4.7 % SL) pyloric caecae; gill rakers short to very short; and, lack of distinct black bars along lateral line. 

Colour

Body predominantly dark olive-brown on back and upper sides above lateral line, extending onto top and sides of head and snout, and lateral sides of trunk posterior to anal fin, becoming lighter brown to cream ventrally. Profusely overlain by dark brown to almost black spots and flecks coalescing into small or moderately large, irregular shaped, blotches, particularly widespread on head, extending to snout, under lower jaw, and to near the latero-ventral margin of the gill covers. Gill cover translucent, dusky grey-brown; pupil black, iris, golden; fins translucent dusky grey.

Conservation

The Stocky Galaxias is threatened by habitat degradation due to the presence of brumbies causing increased sedimentation in the area. Climate change and loss of riparian vegetation are potential threats.

Etymology

The specific name tantangara is taken from the small alpine stream from which the type specimens were collected, a tributary of the upper Murrumbidgee River draining from Mount Tantangara. 

Species Citation

Galaxias tantangara Raadik 2014, Zootaxa 3898(1): 142, fig. 35. Type locality: Tantangara Creek, tributary, above falls 200 m upstream of ford on Alpine Creek Fire Trail, Kosciuszko National Park, upstream of Tantangara Reservoir, New South Wales [35°50'23”S, 148°34'04”E]. 

Author

Bray, D.J. 2020

Resources

Atlas of Living Australia

Stocky Galaxias, Galaxias tantangara Raadik 2014

References


Adams, M., Raadik, T.A., Burridge, C.P. & Georges, A. 2014. Global biodiversity assessment and hyper-cryptic species complexes: more than one species of elephant in the room. Systematic Biology 63(4): 518–533 (as taxon ‘TA’) 

Raadik, T.A. 2011. Systematic revision of the Mountain Galaxias, Galaxias olidus Günther, 1866 species complex (Teleostei: Galaxiidae) in eastern Australia. Ph.D thesis, University of Canberra. pp. i-xxiii, 1-493

Lintermans, M. & Allan, H. 2019. Galaxias tantangara . The IUCN Red List of Threatened Species 2019: e.T122903246A123382161. https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T122903246A123382161.en. Downloaded on 06 February 2020.

Raadik, T.A. 2014. Fifteen from one: a revision of the Galaxias olidus Günther, 1866 complex (Teleostei, Galaxiidae) in south-eastern Australia recognises three previously described taxa and describes 12 new species. Zootaxa 3898(1): 1-198

Threatened Species Unit (2018) Stocky Galaxias – Galaxias tantangara  Primefact 1443, Third edition

Quick Facts


CAAB Code:37102035

Conservation:ASFB & NSW Critically Endangered

Habitat:Freshwater

Max Size:9.2 cm SL

Native:Endemic

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