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Icosteus aenigmaticus, Ragfish
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Icosteus aenigmaticus
Picture by
Van Orden, W.
Teleostei (teleosts) >
Scombriformes
(Mackerels) >
Icosteidae
(Ragfish)
Etymology:
Icosteus:
Greek, eikoo = to sag, to bend something that is soft + Greek, osteon = bone
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; bathypelagic; depth range 0 - 1420 m (Ref.
50550
), usually 18 - 732 m (Ref.
2850
). Deep-water; 66°N - 32°N
North Pacific: Japan to southeastern Alaska and to Point Loma, southern California, USA.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 213 cm TL male/unsexed; (Ref.
2850
)
Dorsal
spines
(total): 0;
Dorsal
soft rays
(total): 52-55;
Anal
spines
: 0;
Anal
soft rays
: 34 - 40. Pectorals rounded, pedunculate (Ref.
6885
). Generally of a chocolate color (Ref.
6885
). Young more robust, with an expanded and rounded caudal fin, 5 pelvic rays, and a brown and yellow irregularly blotched with faint purple color, dusky on fins (Ref.
6885
).
Adults occur near bottom; juveniles in shallow water or offshore near the surface (Ref.
50277
). Feeds on jellyfish (Ref.
50277
), fishes and squids (Ref.
2850
), as well as octopuses (Ref.
4525
).
Eschmeyer, W.N., E.S. Herald and H. Hammann
, 1983. A field guide to Pacific coast fishes of North America. Boston (MA, USA): Houghton Mifflin Company. xii+336 p. (Ref.
2850
)
IUCN Red List Status (Ref.
130435
)
Not Evaluated
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Estimates based on models
Preferred temperature (Ref.
123201
): 2 - 14.1, mean 6.2 °C (based on 1370 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 1.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01995 (0.00906 - 0.04395), b=3.01 (2.83 - 3.19), in cm total length, based on all LWR estimates for this body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 4.5 ±0.57 se; based on food items.
Generation time: 8.5 ( na - na) years. Estimated as median ln(3)/K based on 1
growth studies.
Resilience (Ref.
120179
): Low, minimum population doubling time 4.5 - 14 years (K=0.13; Fec=293,000).
Fishing Vulnerability (Ref.
59153
): High to very high vulnerability (71 of 100).
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mrius-barile
- 20 July 2016
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