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Trematomus eulepidotus, Blunt scalyhead : fisheries
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Trematomus eulepidotus
Picture by
Busson, F.
Teleostei (teleosts) >
Perciformes/Notothenioidei
(Icefishes) >
Nototheniidae
(Cod icefishes) > Trematominae
Etymology:
Trematomus:
Greek, trematos = hole + Greek, tomo = section, cut (Ref.
45335
)
;
eulepidotus:
eu
means true +
lepidotus
means well scaled (Ref.
11892
)
.
More on author:
Regan
.
Issue
The genus
Pseudotrematomus
is a synonym of
Trematomus
, which is confirmed by a molecular study to be published (J.-C. Hureau, pers. comm. 08 Jun. 2010).
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; demersal; depth range 70 - 650 m (Ref.
26875
). Polar; 60°S - 78°S
Southern Ocean: continental shelf of Antarctica and nearby islands, including the South Orkney.
Length at first maturity / Size / Weight / Age
Maturity: L
m
22.0
, range 19 - 26 cm
Max length : 34.5 cm TL male/unsexed; (Ref.
87549
)
Dorsal
spines
(total): 6 - 7;
Dorsal
soft rays
(total): 36-38;
Anal
spines
: 0;
Anal
soft rays
: 34 - 36;
Vertebrae
: 54 - 57. Second dorsal-fin rays 0-3 more than anal-fin rays. Preopercular-mandibular canal with 10 pores; infraorbital canal with 6-8 pores; supra-orbital canal with 4 pores; coronal commissure with a single median pore; temporal canal with 5-6 pores; supratemporal canal complete wit 3 pores. Body and head almost entirely scaled, including snout, preorbitals, posterior part of maxilla, lower jaw, isthmus, branchiostegal membranes and proximal parts of branchiostegal rays. Color: In alcohol, ground color buff, with a chequered pattern formed by staggered dark blotches along the dorsal, lateral and ventral parts of the body; ventral dark blotches may appear as short wavy horizontal dark marks. Snout, occipital region and sometimes interorbital area are dark.
Most common in shallower waters of the continental shelf, especially on banks less than 250 m deep in areas where local upwellings increase food supply (Ref.
6390
). Juveniles are found near the surface, often in association with Antarctic krill (
Euphausia superba
) swarms. Feed on salps, nudibranchs, amphipods, copepods, polychaetes, krill, crustaceans, chaetognaths, and fish (Ref.
6390
).
Mature females may spawn for the first time from around 7-9 years of age (Ref.
71843
).
Dewitt, H.H., P.C. Heemstra and O. Gon
, 1990. Nototheniidae. p. 279-331. In O. Gon and P.C. Heemstra (eds.) Fishes of the Southern Ocean. J.L.B. Smith Institute of Ichthyology, Grahamstown, South Africa. (Ref.
5179
)
IUCN Red List Status (Ref.
130435
)
Not Evaluated
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
Fisheries: commercial
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Estimates based on models
Preferred temperature (Ref.
123201
): -1.8 - 0.9, mean -0.9 °C (based on 436 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5005 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00490 (0.00331 - 0.00724), b=3.26 (3.14 - 3.38), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.4 ±0.1 se; based on diet studies.
Resilience (Ref.
120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Fec = 1,400-12,854).
Fishing Vulnerability (Ref.
59153
): Moderate to high vulnerability (52 of 100).
Climate Vulnerability (Ref.
125649
): High to very high vulnerability (66 of 100).
Price category (Ref.
80766
):
High
.
Nutrients (Ref.
124155
): Calcium = 26.8 [16.2, 66.0] mg/100g; Iron = 0.498 [0.197, 0.983] mg/100g; Protein = 17.1 [16.1, 18.2] %; Omega3 = 0.384 [0.215, 0.659] g/100g; Selenium = 15.5 [6.7, 34.6] μg/100g; VitaminA = 22.2 [4.9, 102.6] μg/100g; Zinc = 0.473 [0.314, 0.718] mg/100g (wet weight); based on
nutrient studies.
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