Gadus chalcogrammus, Alaska pollock : fisheries, gamefish

Gadus chalcogrammus Pallas, 1814

Alaska pollock
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Native range | All suitable habitat | Point map | Year 2050
This map was computer-generated and has not yet been reviewed.
Gadus chalcogrammus   AquaMaps   Data sources: GBIF OBIS
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Image of Gadus chalcogrammus (Alaska pollock)
Gadus chalcogrammus
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> Gadiformes (Cods) > Gadidae (Cods and haddocks)
Etymology: Gadus: Latin, gadus = a fish, cod? (Ref. 45335); chalcogrammus: Name from the Greek 'chalcos' meaning brass and 'gramma' meaning mark (Ref. 6885).
More on author: Pallas.

Taxonomic Remarks
This species is placed in the genus Gadus in Eschmeyer (CofF ver. Jan. 2012: Ref. 89336). More studies are needed for a complete revision of all genera of Gadidae. In the past decade, a number of molecular works have shown that T. chalcogramma coud be deeply nested in a clade that contains the Gadus spp. It has been suggested that the species should be now assigned to Gadus, although none of these works had a conclusive statement with a complete taxonomic re-assessment. However, the name Gadus chalcogrammus may be used in scientific publications. If the American Fisheries Society has endorsed that change in the latest edition of its list of fish names, FAO will not change it until a more stable consensus is reached. Since this species is highly commercial, with a number of regulations and statistical reports using that name, it is preferable to change it with the strongest scientific support. In addition, they are other taxonomic issue in that family, with the same issues about names. Therefore, for the use by the rest of the society, the fishery domain in particular, we recommend to continue using T. chalcogramma and wait that a complete revision of the family and thorough taxonomic and nomenclatural decisions are published.

Milieu: milieu / Klimaatzone / Diepte / verspreidingsgebied Ecologie

marien; brak water benthopelagisch; oceanodroom (Ref. 87829); diepte 0 - 1280 m (Ref. 120982), usually 30 - 590 m (Ref. 120982). Polar; 82°N - 33°N, 9°E - 117°W

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Northeast Atlantic, Arctic and North to Eastern Central Pacific: from Norway to Svalbard, east to Laptev, South Korea and Beaufort Sea, south to California, USA. The occurrence off the northern part of Baja California (Mexico), as reported from Quast and Hall, (1972) (Ref. 6876) is apparently erroneous.

Lengte bij maturiteit / Grootte / Gewicht / Leeftijd

Maturiteit: Lm 36.9  range ? - ? cm
Max length : 91.0 cm TL mannelijk / geslacht onbekend; (Ref. 2850); max. gepubliceerd gewicht: 3.9 kg (Ref. 56335); max. gerapporteerde leeftijd: 28 Jaren (Ref. 55701)

Korte beschrijving Determinatiesleutels | Morfologie | Morfometrie

Dorsale stekels (totaal) : 0; Dorsale zachte stralen (totaal) : 38 - 48; Anale stekels: 0; Anale zachte stralen: 33 - 42. The dorsal fins are widely separated. The pelvic fins have a slightly elongated filament. The lateral line is continuous to about the back end of the first dorsal-fin base; it is interrupted at the read of the body. On the head are lateral line pores. Body color is olive green to brown on the back and becomes silvery on the sides and pale ventrally, often with mottled patterns or blotches.
Body shape (shape guide): fusiform / normal; Cross section: circular.

Biologie     Verklarende woordenlijst (bv. epibenthic)

The adults usually live near to the sea floor, but sometimes they also appear near the surface (Ref. 1371). They perform diurnal vertical migrations (Ref. 1371) and are considered as one of the straddling stocks in the northwest and northeast Pacific (Ref. 87829). They mainly feed on krill (Ref. 39882) but they also eat fishes and crustaceans (Ref. 6885). The adults which are spawning are often solely captured for their roe (may have been the case in the first years of the fishery in the U.S., but hasn't been true for some time. In 1994, the North Pacific Fishery Management Council/NOAA enacted an amendment to the Bering Sea and Gulf of Alaska Fishery Management Plans effectively banning the practice of stripping roe and discarding the carcasses, R. Rogness, pers.comm. April 2022). The meat is used to produce surimi (this is an imitation of shellfish meat) (Ref. 28499). They are traded as fresh fish, boneless flesh, in frozen blocks or as surimi. The fish is cooked in the microwave, steamed or fried in butter (Ref. 9988).

Levenscyclus en paargedrag Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven

Oviparous, sexes are separate (Ref. 205). Congregate in dense schools to spawn, usually at 50 to 250 m depth.

Hoofdreferentie Upload uw referenties | Referenties | Coördinator | Medewerkers

Cohen, D.M., T. Inada, T. Iwamoto and N. Scialabba, 1990. FAO species catalogue. Vol. 10. Gadiform fishes of the world (Order Gadiformes). An annotated and illustrated catalogue of cods, hakes, grenadiers and other gadiform fishes known to date. FAO Fish. Synop. 125(10). Rome: FAO. 442 p. (Ref. 1371)

Status op de Rode Lijst van het IUCN (Ref. 130435: Version 2025-2 (Global))


CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Gevaar voor de mens

  Harmless





Gebruik door de mens

Visserij: van groot commercieel belang; sportvis: ja
FAO - visserij: soortsprofiel, landings search; Publication: search | FishSource | Sea Around Us

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Schattingen op basis van modellen

Fylogenetische diversiteitsindex
(Ref. 82804) 		PD50 = 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight a=0.00631 (0.00550 - 0.00723), b=3.03 (2.99 - 3.07), in cm total length, based on LWR estimates for this species (Ref. 93245).
Trofisch niveau
(Ref. 69278) 		3.6   ±0.1 se; based on diet studies.
Generation time 6.5 (3.6 - 7.8) years. Estimated as median ln(3)/K based on 25 growth studies.
Weerstandsvermogen
(Ref. 120179) 		laag, minimale populatieverdubbelingstijd 4,5-14 jaar (Musick et al. 2000 (Ref. 36717); tmax = 28).
Rate of population increase Prior r = 0.29, 95% CL = 0.19 - 0.44, Based on 16 full stock assessments.
Kwetsbaarheid van de visserij
(Ref. 59153) 		High vulnerability (59 of 100). 🛈
Kwetsbaarheid voor het klimaat
(Ref. 125649) 		High vulnerability (55 of 100). 🛈
Prijsklasse
(Ref. 80766) 		Low.
Voedingsstoffen
(Ref. 124155) 		Calcium = 12 [8, 19] mg/100g; Iron = 0.185 [0.122, 0.296] mg/100g; Protein = 16.5 [15.1, 17.9] %; Omega3 = 0.337 [0.159, 0.741] g/100g; Selenium = 14.5 [5.7, 33.5] μg/100g; VitaminA = 11.2 [2.0, 57.3] μg/100g; Zinc = 0.445 [0.340, 0.563] mg/100g (wet weight); based on nutrient studies.