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Galaxias olidus, Mountain Galaxias
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Galaxias olidus
Picture by
Aland, G.
Teleostei (teleosts) >
Galaxiiformes
(Southern smelts) >
Galaxiidae
(Galaxiids) > Galaxiinae
Etymology:
Galaxias:
Greek, galaxias, ou = a kind of fish (Ref.
45335
)
;
olidus:
Name from Latin 'fusc', meaning brown, dark, dusky or tawny; possibly referring to the distinctive and dark bars on the sides of the body which the author referred to as '..prominent dark oval blotches..'; live colouration of the majority of
Galaxias fuscus
is a dusky orange-brown, and the type material is currently also a tawny colour, hence the species name is apt.
.
More on author:
Günther
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; benthopelagic; depth range 0 - 1 m (Ref.
98815
). Temperate; 4°C - 30°C (Ref.
2060
)
Oceania: endemic to Australia
Size / Weight / Age
Maturity: L
m
?
range ? - ? cm
Max length : 10.7 cm SL male/unsexed; (Ref.
98815
); common length : 7.0 cm SL male/unsexed; (Ref.
5259
); max. published weight: 25.00 g (Ref.
98815
); max. reported age: 4 years (Ref.
5259
)
Dorsal
soft rays
(total): 7-12;
Anal
soft rays
: 8 - 14;
Vertebrae
: 49 - 60. This species is distinguished by the following set of characters and careful comparison with the diagnoses, descriptions and geographical distributions of the other species: some populations, or individuals within a population, have a series of small, closely-spaced and short, distinct mid-lateral black bars, usually extending from near the pectoral fin base posteriorly to past the pelvic fin base, though equally as often, absent; body depth at vent moderately shallow (8.3-16.9 % SL); caudal peduncle length similar to that of caudal fin, relatively shortish, but moderately deep; dorsal midline usually partly flattened anteriorly from above pelvic fins; trunk with dorsal and ventral profiles relatively gently and evenly arched; interorbital often relatively flat though sometimes slightly to strongly convex; nostrils short to moderately long, usually non-visible from ventral view; mouth generally terminal, occasionally slightly sub-terminal; lower jaw shorter than upper jaw; caudal peduncle flanges usually low and long. generally reaching to, or near, the anal fin base; anal fin origin usually under 0.68 (0.21-1.14) distance posteriorly along dorsal fin base; pyloric caecae 1, more often 2, of moderate length (mean length of 3.1 % SL); gill rakers variable, short to moderately long and stout to moderately thin; expanded caudal fin rays usually equal to body depth through pectoral fin base, occasionally wider or narrower; lamina of paired fins oriented anterio-ventrally to ventrally; raised lamellae can be present on ventral surface of rays, and if so, weakly to strongly developed (Ref.
98815
).
Facultative air-breathing in the genus (Ref.
126274
); Adults live mainly in small, clear, flowing streams with gravel or sand bottoms from near sea level to about 1800 m elevation. May be cryptic, living among log debris and boulders, or sometimes found in loose shoals in more open conditions. Also occur in small upland tarns where they may be found shoaling in open water. Tolerant of very cold water, they have been collected from a tarn surrounded by deep snow. Life cycle (maximum life span of about 4 years) is restricted to fresh water. Feed on benthic and drifting invertebrates. Mature individuals breed in spring (sometimes extending to autumn); adults move upstream into shallow riffle areas to lay their demersal, adhesive eggs over rocky bottoms (Ref.
44894
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
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):001-198. (Ref.
98815
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
15 February 2019
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Zoological Record
Estimates based on models
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00479 (0.00227 - 0.01008), b=3.07 (2.88 - 3.26), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245
).
Trophic level (Ref.
69278
): 2.9 ±0.49 se; based on food items.
Generation time: 1.5 ( na - na) years. Estimated as median ln(3)/K based on 1
growth studies.
Resilience (Ref.
120179
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153
): Low vulnerability (19 of 100).
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- 20 July 2016
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