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Galaxiiformes (Southern smelts) >
Galaxiidae (Galaxiids) > Galaxiinae
Etymology: Galaxias: Greek, galaxias, ou = a kind of fish (Ref. 45335); arcanus: Name from Latin 'arcanus' meaning cryptic, secret or mysterious, referring to the cryptic habitat occupied by this species, among boulder and cobbles on the stream bed, and its cryptic colouration.
Môi trường: môi trường / vùng khí hậu / Mức độ sâu / phạm vi phân phối
Sinh thái học
; nước ngọt sống nổi và đáy; không di cư; mức độ sâu 0 - 1 m (Ref. 98815). Subtropical
Oceania: Australia.
Bộ gần gũi / Khối lượng (Trọng lượng) / Tuổi
Chín muồi sinh dục: Lm ?  range ? - ? cm
Max length : 9.8 cm FL con đực/không giới tính; (Ref. 98815); Khối lượng cực đại được công bố: 6.00 g (Ref. 98815)
Mô tả ngắn gọn
Khóa để định loại | Hình thái học | Sinh trắc học
Các vây lưng mềm (tổng cộng) : 8 - 11; Tia mềm vây hậu môn: 8 - 12; Động vật có xương sống: 47 - 54. This species is distinguished from all other species in the Galaxias olidus complex by the following set of characters: a shallow body with a straight ventral profile; long and shallow caudal peduncle, its peduncle length is greater than the caudal fin length; caudal peduncle flanges are poorly developed; the distinctive snout extends anteriorly from the thick and fleshy upper jaw as a fleshy protrubence, bulbous in lateral profile; nostrils of moderate length, ofter not visible from ventral view; subterminal mouth and lower jaw 81.5 (72.9-99.4) % of length of upper jaw; most anterior tip of snout level with about lower 0.3 of eye diameter; head wide and shallow; short pre-pelvic fin length, pectoral fin to pelvic fin length and post-orbital head length dimensions; large, ventrally oriented pectoral and pelvic fins (12.1-16.7 and 9.2-13.0 % SL respectively); low mean vertebral count of 51, although range is broad (47-55); pyloric caecae 0-1, when present it is short (1.0 % SL) and wide; gill rakers of moderate length, thin and sharply pointed; anal fin origin usually under 0.4 distance posteriorly along dorsal fin base; distinctive cryptic colouration and no black bars along lateral line (Ref. 98815).
Cross section: oval.
Facultative air-breathing in the genus (Ref. 126274); A freshwater fish not able to undertake diadromous migrations. It was collected at a density ranging from < 0.01-0.80 fish/m2, but as individuals are usually hidden amongst or within the substrate in fast-flowing areas which are difficult to sample, these values are considered a gross underestimate of its relative abundance. Also recorded from cold to relatively cool, clear water in flowing creeks to large rivers (1.0-20.0 m average width), usually in shallow (0.1-0.4 m average depth), fast-flowing and high energy riffles and runs, although juveniles have been recorded moving upstream through slow water along the shallow edges of pools. The substrate in riffles and runs are mainly a complex of abundant cobbles and pebbles, with smaller amounts of bedrock, boulder, gravel and coarse sand. Fish are typically found within the diverse substrate, either amongst or under rocks on the stream bed, or deeper in the interstitial spaces of the substratum. It is usually not associated with aquatic vegetation, but have been found amongst small and large timber debris.
Adults often are solitary; juveniles and younger adults observed in loose shoals of 50+ individuals, moving upstream during the day in shallow, slow-flowing water along the edge of pools, between riffle habitats: fish 3.8-6.6 cm LCF were recorded moving upstream in the Acheron River and individuals < 5.0 cm LCF observed along the edge in the Steavenson River (Goulburn system) in late May 2001; and, individuals 4.9-6.7 cm LCF were collected moving upstream along the edge of a long pool in the Mitta Mitta River (upper Murray system) in late June 2002. This suggests active upstream dispersal by younger age-classes of fish. Individuals from the Steavenson River, downstream from Marysville, were found with cysts, possibly trematode metacercariae, embedded in the skin of the trunk and fins.
This species is often collected with the native species Gadopsis bispinosus (Two-spined Blackfish), Galaxias olidus s.s., Euastacus armatus (Murray Spiny Crayfish), Euastacus crassus (Alpine Spiny Crayfish), a shrimp (Atyidae) and including the alien species Brown Trout and Rainbow Trout (Oncorhynchus mykiss), and less often with the native Galaxias oliros (Obscure Galaxias) and Broadfinned Galaxias (Ref. 98815).
Vòng đời và hành vi giao phối
Chín muồi sinh dục | Sự tái sinh sản | Đẻ trứng | Các trứng | Sự sinh sản | Ấu trùng
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)
Tình trạng Sách đỏ IUCN (Ref. 130435: Version 2025-2 (Global))
Mối đe dọa đối với con người
Harmless
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Ước tính dựa trên mô hình
Chỉ số đa dạng phát sinh loài (Tài liệu tham khảo 82804) |
PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00490 (0.00205 - 0.01170), b=3.12 (2.91 - 3.33), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245). |
Mức dinh dưỡng (Tài liệu tham khảo 69278) |
3.2 ±0.4 se; based on size and trophs of closest relatives |
Thích nghi nhanh (Tài liệu tham khảo 120179) |
Chiêù cao, thời gian nhân đôi của chủng quần tối thiểu là dưới 15 tháng (Preliminary K or Fecundity.). |
Sự dễ bị tổn thương của nghề đánh cá (Ref. 59153) |
Low vulnerability (17 of 100). 🛈 |