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Narke japonica, Japanese sleeper ray : fisheries
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Japanese sleeper ray
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Narke japonica
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Cornish, A.
Elasmobranchii (sharks and rays) >
Torpediniformes
(Electric rays) >
Narkidae
(Sleeper rays)
Etymology:
Narke:
Greek, narke = numbness (Ref.
45335
)
.
More on authors:
Temminck
&
Schlegel
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; reef-associated; depth range 100 - ? m (Ref.
114953
). Subtropical; 37°N - 20°N, 114°E - 139°E (Ref.
114953
)
Northwest Pacific: southern Japan to the South China Sea near Hong Kong, including Taiwan.
Length at first maturity / Size / Weight / Age
Maturity: L
m
 
?
, range 35 - ? cm
Max length : 40.0 cm TL male/unsexed; (Ref.
12951
)
Occurs inshore and offshore (Ref.
9913
,
11230
). Found on sand, often near rocky reefs (Ref.
12951
). Biology little known (Ref.
9913
), but locally common in Taiwan and Japan (Ref.
114953
). Produces 4-6 pups per litter. Maturity size of males known at 25 cm TL. Not utilized for food. Capable of producing a moderate shock to humans (Ref.
114953
). Does not do well in aquariums (Ref.
12951
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Ovoviviparous. Up to 5 in a litter (Ref.
12951
).
Compagno, L.J.V. and P.R. Last
, 1999. Narkidae. Sleeper rays. p. 1443-1446. In K.E. Carpenter and V.H. Niem (eds.) FAO identification guide for fishery purposes. The living marine resources of the Western Central Pacific. FAO, Rome. (Ref.
9913
)
IUCN Red List Status (Ref.
130435
)
Vulnerable (VU)
(A2cd); Date assessed:
17 May 2021
CITES
Not Evaluated
Not Evaluated
Threat to humans
Other (Ref.
10011
)
Human uses
Fisheries: minor commercial
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Zoological Record
Estimates based on models
Preferred temperature (Ref.
123201
): 18.5 - 28.9, mean 26.8 °C (based on 559 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.6252 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.5 ±0.37 se; based on food items.
Resilience (Ref.
120179
): Low, minimum population doubling time 4.5 - 14 years (Assuming fecundity<100).
Fishing Vulnerability (Ref.
59153
): Low to moderate vulnerability (30 of 100).
Price category (Ref.
80766
):
Unknown
.
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- 20 July 2016
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