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Gadus chalcogrammus Pallas, 1814

Alaska pollock
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Native range | All suitable habitat | Point map | Year 2050
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Gadus chalcogrammus   AquaMaps   Data sources: GBIF OBIS
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Image of Gadus chalcogrammus (Alaska pollock)
Gadus chalcogrammus
Picture by Archipelago Marine Research Ltd.

Common names from other countries

Lieu de l'Alaska, Colín de Alaska, قدّيّة ألاسكا, ... more

Classification / Names Κοινά ονόματα | Συνώνυμα | Catalog of Fishes(Γένος, Είδη) | ITIS | CoL | WoRMS | Cloffa

> 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.

Issue
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.

Environment: milieu / climate zone / depth range / distribution range Οικολογία

Θαλασσινό(ά); Υφάλμυρο βενθοπελαγικό; μη μεταναστευτικό(ά); εύρος βάθους ? - 1280 m (Ref. 50550), usually 30 - 400 m (Ref. 54255).   Polar; 68°N - 34°N, 129°E - 120°W (Ref. 54255)

Κατανομή Χώρες | Περιοχές FAO | Οικοσυστήματα | Παρουσίες | Point map | Εισαγωγές | Faunafri

North Pacific: from Kivalina, Alaska, to the southern Sea of Japan and to Carmel, California, USA. The occurrence off the northern part of Baja California (Mexico), as reported from Quast and Hall, (1972) (Ref. 6876) is apparently erroneous.

Length at first maturity / Μέγεθος / Βάρος / Age

Maturity: Lm 36.9  range ? - ? cm
Max length : 91.0 cm TL αρσενικό/απροσδιόριστο; (Ref. 2850); μεγ. δημοσιευμένο βάρος: 3.9 kg (Ref. 56335); μεγ. αναφερόμενη ηλικία: 28 έτη (Ref. 55701)

Short description Κλείδες προσδιορισμού | Μορφολογία | Μορφομετρία

Ραχιαίες άκανθες (συνολικά) : 0; Μαλακές ραχιαίες ακτίνες (συνολικά) : 38 - 48; Εδρικές άκανθες: 0; Μαλακές εδρικές ακτίνες: 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.

Βιολογία     Γλωσσάρι (π.χ. 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). 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).

Life cycle and mating behavior Maturities | Αναπαραγωγή | Spawnings | Egg(s) | Fecundities | Προνύμφες

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

Main reference Upload your references | Αναφορές | Συντονιστής | Συνεργάτες

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)

IUCN Red List Status (Ref. 130435)

  Not Evaluated 

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless




Human uses

αλιεία: πολύ εμπορικό
FAO(αλιεία: Παραγωγή, species profile; publication : search) | FishSource | Η θάλασσα γύρω μας

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Estimates based on models

Preferred temperature (Ref. 115969): 0.4 - 5.6, mean 1.6 (based on 444 cells).
Phylogenetic diversity index (Ref. 82804):  PD50 = 0.6250   [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).
Τροφικό Επίπεδο (Ref. 69278):  3.6   ±0.1 se; based on diet studies.
Ελαστικότητα (Ref. 120179):  Χαμηλό, ελάχιστος χρόνος για διπλασιασμό πληθυσμού 4,5 - 14 έτη (Musick et al. 2000 (Ref. 36717); tmax = 28).
Prior r = 0.29, 95% CL = 0.19 - 0.44, Based on 16 full stock assessments.
Fishing Vulnerability (Ref. 59153):  High vulnerability (59 of 100).
Climate Vulnerability (Ref. 125649):  High vulnerability (55 of 100).
Price category (Ref. 80766):   Low.