http://www.fishbase.org/Summary/speciesSummary.php?genusname=Narcine&speciesname=rierai ---> http://192.134.151.83/Summary/speciesSummary.php?genusname=Narcine&speciesname=rierai http://192.134.151.83/Summary/speciesSummary.php?genusname=Narcine&speciesname=rierai ---> https://fishbase.mnhn.fr/Summary/speciesSummary.php?genusname=Narcine&speciesname=rierai https://fishbase.mnhn.fr/Summary/speciesSummary.php?genusname=Narcine&speciesname=rierai ---> https://fishbase.mnhn.fr/summary/Narcine-rierai.html
Narcine rierai, Slender electric ray
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Narcine rierai
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Elasmobranchii (sharks and rays) >
Torpediniformes
(Electric rays) >
Narcinidae
(Numbfishes)
Etymology:
Narcine:
Greek, narke = numbness (Ref.
45335
)
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; bathydemersal; depth range 170 - 500 m (Ref.
114953
). Deep-water; 2°N - 20°S, 35°E - 48°E (Ref.
114953
)
Western Indian Ocean: central Somalia to at least Mozambique.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 30.1 cm TL male/unsexed; (Ref.
11228
)
Short description
Morphology
|
Morphometrics
Shovel-shaped disc with a long tail (much longer than disc length); a longer-than-wide nasal curtain; slender tooth bands that are subtriangular in shape (Ref.
49866
). Uniform light brown or golden-brown dorsally (Ref.
49866
).
Known based on 11 specimens. Males mature at 26 cm TL; born at ca. 9 cm TL. Low fecundity based on two mid-term embryos (each just over 7 cm) found in right uterus of large female (Ref.
114953
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Heemstra, P.C.
, 1995. Additions and corrections for the 1995 impression. p. v-xv. In M.M. Smith and P.C. Heemstra (eds.) Revised Edition of Smiths' Sea Fishes. Springer-Verlag, Berlin. (Ref.
11228
)
IUCN Red List Status (Ref.
130435
)
Data deficient (DD)
; Date assessed:
24 April 2018
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Zoological Record
Estimates based on models
Preferred temperature (Ref.
123201
): 13.8 - 15.9, mean 15.1 °C (based on 7 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01175 (0.00476 - 0.02897), b=2.88 (2.66 - 3.10), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.1 ±0.3 se; based on size and trophs of closest relatives
Resilience (Ref.
120179
): Low, minimum population doubling time 4.5 - 14 years (Assuming fecundity<100).
Fishing Vulnerability (Ref.
59153
): Low vulnerability (20 of 100).
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mrius-barile
- 20 July 2016
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