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Galaxias mungadhan Raadik, 2014

Dargo Galaxias
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> Galaxiiformes (Southern smelts) > Galaxiidae (Galaxiids) > Galaxiinae
Etymology: Galaxias: Greek, galaxias, ou = a kind of fish (Ref. 45335); mungadhan: Name from the language of the Gunai/Kurnai indigenous nation (traditional inhabitants of the Gippsland region of Victoria): ‘munga’ meaning from, and ‘dhan’ meaning frost or snow, referring to its distribution at high elevations on the Dargo High Plains which are usually covered by snow during winter.

Environment: milieu / climate zone / depth range / distribution range 生態学

; 新鮮な水 底生の漂泳性; 移住性ではない; 深さの範囲 0 - 1 m (Ref. 98815). Subtropical

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Oceania: Australia.

サイズ / 重さ / 年齢

Maturity: Lm ?  range ? - ? cm
Max length : 11.0 cm FL オス/雌雄の選別がない; (Ref. 98815); 最大公表体重: 11.00 g (Ref. 98815)

簡単な記述 検索表 | 形態学 | 形態計測学

背鰭 (合計) : 9 - 11; 臀鰭: 9 - 11; 脊つい: 55. This species is distinguished from its congeners within the Galaxias olidus complex by the following characters: a long distance between pelvic and anal fin bases (22.4-27.7 % SL); head shallow (30.0-42.6 % HL), post-orbital head length long (54.7-62.4 % HL); inter-orbital narrow (35.1-40.4 % HL); nostrils are of moderate length, not visible from ventral view; dorsal and anal fin origins are set far back along trunk (70.5-74.5 and 74.4-79.9 % SL, respectively); body depth through pectoral fin base greater (121.2 % SL) than that through vent; anal fin base is short (9.0-10.7 % SL), usually shorter than dorsal fin base; dorsal fin is short (13-15 % SL), anal fin moderately short (13.2-15.6 % SL); lower jaw length is much shorter (67.8-89.0 %) than width of gape; expanded rays of caudal fin equal to or less than body depth through pectoral fin base; dorsal midline usually flattened anteriorly from above or slightly posterior to pectoral fin bases; often 10-segmented anal fin rays; posterior extent of mouth about 0.8 eye diameter below ventral margin of eye; pyloric caecae may be present or absent, if present, as a single, wide and blunt, short (0.7 % SL) caecum; gill rakers are short and stout; anal fin origin usually under 0.61 distance posteriorly along dorsal fin base; no distinct black bars along lateral line; and, usually dark chocolate brown overall when alive (Ref. 98815).

生物学     用語集 (例 epibenthic)

Facultative air-breathing in the genus (Ref. 126274); A freshwater fish that is unable to undertake diadromous migrations. Recorded from a small (0.5-1.3 m average width, 0.05-0.40 m average depth), cool, clear, alpine creek, flowing through a grassy plain, consisting predominantly of riffles and pools, and with very little shading except that provided by grasses. During winter this catchment is often covered by snow for varying periods of time. Substrate consisted mainly of bedrock with some loose boulders, with smaller amounts of pebble, gravel, sand and clay and overlain in backwaters by silt. Instream cover provided by rock and by bank and vegetation (alpine grasses) overhang, and pools averaged 0.5 m in depth. Recorded at densities of 4.2-6.4 fish/m2 and is the only native fish species so far recorded from within its range and the only species of Galaxias found within its current restricted range. Historically have been found with Galaxias olidus, which is present nearby. Galaxias brevipinnis, Galaxias maculatus and Galaxias truttaceus are found farther downstream in the Dargo River system and their ranges may also have historically overlapped with this species. Alien trout have substantially altered distributional patterns in the last 150 years and fragmented and reduced the distributional range of galaxiids and their populations (Ref. 98815).

Life cycle and mating behavior 成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生

主な参考文献 Upload your references | 参考文献 | コーディネーター : Berra, Tim M. | 協力者

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のレッドリストの状況は (Ref. 130435: Version 2024-2)

  絶滅寸前の危機的状況 (CR) (A3ce; B1ab(i,ii,iii,iv,v)); Date assessed: 14 February 2019

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

  Harmless





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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = No PD50 data   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00490 (0.00206 - 0.01165), b=3.12 (2.91 - 3.33), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
栄養段階 (Ref. 69278):  3.2   ±0.4 se; based on size and trophs of closest relatives
回復力 (Ref. 120179):  高い, １５か月以下の倍増期間の最小個体群 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref. 59153):  Low vulnerability (10 of 100).