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Hemitripterus villosus
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Hemitripterus villosus
Picture by
Markevich, A.I.
Teleostei (teleosts) >
Perciformes/Cottoidei
(Sculpins) >
Agonidae
(Poachers) > Hemitripterinae
Etymology:
Hemitripterus:
Greek, hemi = half + Greek, tres, tria = three + Greek, pteron = wing, fin (Ref.
45335
)
.
More on author:
Pallas
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; demersal; depth range 0 - 550 m (Ref.
50550
). Temperate; 66°N -
Northwest Pacific: Karaginskiy and Commander islands, Bering Sea to Okhotsk and Japan seas; one record from the western Gulf of Alaska.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 35.0 cm SL male/unsexed; (Ref.
559
)
Short description
Morphology
|
Morphometrics
Dorsal
spines
(total): 17 - 19;
Dorsal
soft rays
(total): 11-13;
Anal
spines
: 0;
Anal
soft rays
: 12 - 15. Body covered with many small tubercles; head large, with numerous bony humps and ridges; spinous dorsal fin deeply emarginate, its base longer than that of the soft dorsal fin; jaws, prevomer and palatines with broad bands of conical teeth (Ref.
559
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Spawn in the calcareous deposits of colonies of the polychaeta,
Salmacina
sp. which makes them more of 'cavity spawners' than 'spawners in live vertebrate' (Ref.
34819
,
26281
).
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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Zoological Record
Estimates based on models
Preferred temperature (Ref.
123201
): 0.9 - 11, mean 4.7 °C (based on 411 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.6289 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01096 (0.00493 - 0.02437), b=3.06 (2.86 - 3.26), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245
).
Trophic level (Ref.
69278
): 4.3 ±0.4 se; based on diet studies.
Resilience (Ref.
120179
): Low, minimum population doubling time 4.5 - 14 years (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153
): Low to moderate vulnerability (33 of 100).
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- 20 July 2016
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