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Squalus edmundsi, Edmund's spurdog
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Edmund's spurdog
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Elasmobranchii (sharks and rays) >
Squaliformes
(Sleeper and dogfish sharks) >
Squalidae
(Dogfish sharks)
Etymology:
Squalus:
Genus name from Latin 'squalus' meaning shark (Ref.
6885, 27436
)
;
edmundsi:
Named for Matt Edmunds, formerly with CSIRO Marine Laboratory in the 1990s.
.
More on authors:
White
,
Last
&
Stevens
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; pelagic-oceanic; depth range 204 - 850 m (Ref.
58442
), usually 300 - 500 m (Ref.
58442
). Tropical
Eastern Indian Ocean: Western Australia and Indonesia.
Size / Weight / Age
Maturity: L
m
?
range ? - ? cm
Max length : 70.0 cm TL male/unsexed; (Ref.
58442
); 86.6 cm TL (female)
Short description
Morphology
|
Morphometrics
This moderate-sized species of the ‘mitsukurii group’ has the following set of characters: moderately elongate body, depth 9.9-11.5% TL; narrowly triangular snout, moderately long, preoral length 2.0-2.44 times the horizontal prenarial length, 10.3-10.8% TL, mouth width 1.56-1.81 (1.73) times the horizontal prenarial length; pre-first dorsal length 27.7-30.0 (28.5)% TL; pre-second dorsal length 60.2-62.9 (61.3)% TL; interdorsal space 23.5-25.6 (24.7)% TL; weakly bifurcated anterior nasal flap; first dorsal fin large, upright, first dorsal-fin height 7.0-8.0% TL; first dorsal-fin spine strong, upright and broad-based; second dorsal-fin spine long, moderately broad-based; prepectoral length 21.9-23.1 (22.6)% TL; pelvic-caudal space 25.0-26.7 (25.9)% TL; pectoral fin of adult individuals not falcate; pectoral-fin inner margin relatively short, 6.4-7.1% TL; caudal bar is oblique, extending along base of lower lobe to caudal fork, less than 0.1-0.2 of posterior margin of upper lobe, upper caudal fringe narrow, with a large dark saddle, distinctly closer to tip of lobe than its base; flank denticles are strongly tricuspidate; monospondylous centra 43-44, precaudal centra 86-91, total centra 1130-120 (Ref.
58442
).
Commonly caught by demersal longline fisheries operating in deepwater; utilized for its meat, fins and liver oil which is of high value (Ref.
58048
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Distinct pairing with embrace (Ref.
205
).
White, W.T., P.R. Last and J.D. Stevens
, 2007. Two new species of
Squalus
of the 'mitsukurii group' from the Indo-Pacific. pp. 71-81. In P.R. Last, W.T. White and J.J. Pogonoski Descriptions of new dogfishes of the genus
Squalus (Squaloidea: Squalidae
). CSIRO Marine and Atmospheric Research Paper No. 014. 130 pp. (Ref.
58442
)
IUCN Red List Status (Ref.
130435
)
Near Threatened (NT)
(A2d+3d); Date assessed:
01 August 2018
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Estimates based on models
Preferred temperature (Ref.
123201
): 6.6 - 13.7, mean 9.9 °C (based on 256 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00339 (0.00162 - 0.00707), b=3.10 (2.93 - 3.27), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 4.3 ±0.4 se; based on size and trophs of closest relatives
Resilience (Ref.
120179
): Very Low, minimum population doubling time more than 14 years (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153
): Moderate to high vulnerability (55 of 100).
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