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Macropinna microstoma, Barreleye
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Macropinna microstoma
Picture by
MBARI
Teleostei (teleosts) >
Argentiniformes
(Marine smelts) >
Opisthoproctidae
(Barreleyes or spookfishes)
Etymology:
Macropinna:
Greek, makros = great + Latin, pinna = thorn (Ref.
45335
)
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; bathypelagic; depth range 16 - 1267 m (Ref.
96339
). Deep-water; 66°N - 21°N, 128°E - 109°W
North Pacific: Bering Sea to Japan, and Baja California, Mexico.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 15.0 cm TL male/unsexed; (Ref.
87380
)
Dorsal
spines
(total): 0;
Dorsal
soft rays
(total): 11;
Anal
spines
: 0;
Anal
soft rays
: 14. This species' most striking feature is the transparent, cowl-like shield that covers the top of the head, and its prominent tubular eyes within. The shield is a tough, flexible integument that attaches to the dorsal and medial scales behind the head, and to the broad, transparent subocular bones that protect the eyes laterally. The fluid-field chamber found beneath the shield surrounds and protects the eyes with vivid green lenses. The tubular eyes of this fish can look forward as well as upward (with maximum arc of rotation observed about 75 degrees). The morphology of the eyes apparently allow at least two feeding modes: (1) with body horizontal and with eyes directed upward, it can spot food against lighted waters above, it pivots its body to bring the mouth up for ingestion while eyes are locked on target, rotating from dorsal to rostral relative to the body; and (2) with body horizontal, eyes rotate dorsal to rostral while tracking the path of descending food until it reaches the level of the mouth (Ref.
87379
). Adipose at the base of the caudal peduncle (Ref.
6885
). Adults dark brown (Ref.
6885
).
A solitary fish, occurring at lower mesopelagic depths beneath temperate and subarctic waters. Caught by midwater trawl nets in areas with bottom depths of 1600-3600 m. Stomach contents include cnidarian remains, however, its visceral anatomy suggests diets of mixed zooplankton, including both gelatinous and crustacean prey and siphonophore tentacles and nematocysts (Ref.
87379
). Uncommon species (Ref.
6885
). Oviparous, with planktonic larvae (Ref.
35626
). A photo of a 15 cm long fish shown at http://www.newscientist.com/gallery/new-species/9.
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Oviparous (Ref.
35626
).
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
): 0.6 - 6.8, mean 3.7 °C (based on 175 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01122 (0.00514 - 0.02450), b=3.04 (2.87 - 3.21), in cm total length, based on all LWR estimates for this body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.6 ±0.1 se; based on size and trophs of closest relatives
Resilience (Ref.
120179
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153
): Low vulnerability (10 of 100).
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- 20 July 2016
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