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Bathyraja griseocauda, Graytail skate
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Bathyraja griseocauda
Picture by
Lloris, D.
Elasmobranchii (sharks and rays) >
Rajiformes
(Skates and rays) >
Arhynchobatidae
(Softnose skates)
Etymology:
Bathyraja:
Greek, bathys = deep + Latin, raja, -ae = a ray (Raja sp) (Ref.
45335
)
.
More on author:
Norman
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; bathydemersal; depth range 94 - 585 m (Ref.
11892
). Deep-water; 1°C - ? (Ref.
11892
); 34°S - 70°S, 77°W - 26°W
Southeast Pacific and Southwest Atlantic: Uruguay (Ref.
58839
) to Patagonian coast of South America including the Falkland Islands. Southern Ocean: Scotia Arc to South Shetland Islands and the Antarctic Peninsula.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 49.0 cm TL male/unsexed; (Ref.
11892
)
Oviparous (Ref.
50449
). Eggs have horn-like projections on the shell (Ref.
205
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref.
50449
). Eggs have horn-like projections on the shell (Ref.
205
).
McEachran, J.D. and K.A. Dunn
, 1998. Phylogenetic analysis of skates, a morphologically conservative clade of elasmobranchs (Chondrichthyes: Rajidae). Copeia 1998(2):271-290. (Ref.
27314
)
IUCN Red List Status (Ref.
130435
)
Endangered (EN)
(A2bd); Date assessed:
08 February 2019
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
): 2.7 - 7.7, mean 5.7 °C (based on 81 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00513 (0.00253 - 0.01042), b=3.12 (2.95 - 3.29), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 4.0 ±0.65 se; based on food items.
Resilience (Ref.
120179
): Low, minimum population doubling time 4.5 - 14 years (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153
): Moderate vulnerability (39 of 100).
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- 20 July 2016
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