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Galaxiella nigrostriata, Blackstriped dwarf galaxias
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Blackstriped dwarf galaxias
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Galaxiella nigrostriata
Picture by
Berra, T.M.
Teleostei (teleosts) >
Galaxiiformes
(Southern smelts) >
Galaxiidae
(Galaxiids) > Galaxiinae
Etymology:
Galaxiella:
Greek, galaxias, ou = a kind of fish, diminutive (Ref.
45335
)
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; demersal. Temperate; 10°C - 30°C (Ref.
86895
); 34°S - 35°S
Eastern Indian Ocean: Western Australia (from Augusta to Albany, and three remnant populations - Near Bunbury, Melaleuca Park north of Perth and Lake Chandala north of Muchea).
Length at first maturity / Size / Weight / Age
Maturity: L
m
3.7
  range ? - ? cm
Max length : 4.4 cm TL male/unsexed; (Ref.
6849
); 4.8 cm TL (female); common length : 3.0 cm SL male/unsexed; (Ref.
5259
); max. reported age: 1.00 years (Ref.
6849
)
Short description
Morphology
|
Morphometrics
Dorsal
spines
(total): 0;
Dorsal
soft rays
(total): 6-8;
Anal
spines
: 0;
Anal
soft rays
: 8 - 11;
Vertebrae
: 38 - 43
Facultative air-breathing in the genus (Ref.
126274
); Occur in slow-running, tea-colored streams usually in sandy areas. Also found in swamps, small ponds and roadside ditches. Also lives in the vegetated shallows of some freshwater lakes. Water is typically acidic (pH 4.5-6.5) and darkly tannin-stained. An inhabitant of temporary waters, capable of aestivating in damp bottom sediments over summer. Spawning habits similar to
G. munda
. Most individuals perish after their first spawning (Ref.
44894
). Feed on small insects, larvae of aquatic insects and micro-crustaceans. Breeding is associated with winter rains. Males take on a bright color pattern at the start of the breeding season (Ref.
33842
).
Allen, G.R., S.H. Midgley and M. Allen
, 2002. Field guide to the freshwater fishes of Australia. Western Australian Museum, Perth, Western Australia. 394 p. (Ref.
44894
)
IUCN Red List Status (Ref.
130435
)
Endangered (EN)
(B2ab(i,ii,iii,iv,v)); Date assessed:
09 January 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
= 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: 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
).
Trophic level (Ref.
69278
): 3.0 ±0.00 se; based on food items.
Generation time: 0.4 ( na - na) years. Estimated as median ln(3)/K based on 2
growth studies.
Resilience (Ref.
120179
): Medium, minimum population doubling time 1.4 - 4.4 years (tm=1; tmax=1; assuming Fec<100).
Fishing Vulnerability (Ref.
59153
): Low vulnerability (10 of 100).
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- 20 July 2016
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