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Hemitriakis japanica, Japanese topeshark : fisheries
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Elasmobranchii (sharks and rays) >
Carcharhiniformes
(Ground sharks) >
Triakidae
(Houndsharks) > Galeorhininae
Etymology:
Hemitriakis:
hemi-
, from
hemisys
(Gr.), half, being a genus that Herre believed was “most closely related” to
Triakis
. (
See ETYFish
)
;
japanica:
-ica
(L.), belonging to: Japan, type locality. (
See ETYFish
)
.
More on authors:
Müller
&
Henle
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; demersal; depth range 20 - 345 m (Ref.
86942
). Subtropical; 40°N - 19°N, 112°E - 141°E
Northwest Pacific: China, Taiwan, Korea, and Japan. Nominal records from Ambon, Indonesia (unconfirmed and based on a specimen close to if not identical to
Hemitriakis abdita
) and New Caledonia (Ref.
13563
).
Length at first maturity / Size / Weight / Age
Maturity: L
m
91.5
, range 81 - 102 cm
Max length : 110 cm TL male/unsexed; (Ref.
244
); 120.0 cm TL (female); max. reported age: 15 years (Ref.
9031
)
Occurs close inshore and offshore down to at least 100 m depth. Presumably feeds on small fishes, cephalopods and crustaceans. Ovoviviparous, with 8 to 22 young in a litter. Size at birth about 20 to 21 cm. Utilized for human consumption.
Ovoviviparous, embryos feed solely on yolk (Ref.
50449
).
Compagno, L.J.V.
, 1984. FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO. (Ref.
244
)
IUCN Red List Status (Ref.
130435
)
Endangered (EN)
(A2d); Date assessed:
29 August 2019
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
Fisheries: commercial
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Zoological Record
Estimates based on models
Preferred temperature (Ref.
123201
): 9.7 - 27, mean 20.2 °C (based on 252 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5156 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00427 (0.00183 - 0.00992), b=3.04 (2.83 - 3.25), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 4.4 ±0.4 se; based on diet studies.
Resilience (Ref.
120179
): Very Low, minimum population doubling time more than 14 years (Fec=8).
Fishing Vulnerability (Ref.
59153
): High to very high vulnerability (72 of 100).
Price category (Ref.
80766
):
High
.
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