Theragra chalcogramma (Pallas, 1814)

Alaska pollock

Catalog of Fishes (gen., sp.) | ITIS | CoL

Classification	Actinopterygii \| Gadiformes \| Gadidae
Synonyms	Gadus chalcogrammus, Pollachius chalcogrammus, Theragra chalcogrammus chalcogrammus, ... more
Common names	Lieu de l'Alaska, Colín de Alaska, Walleye pollock, ... more

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Image of Theragra chalcogramma (Alaska pollock)

Picture by Bryan, D.

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AquaMaps Data sources: GBIF OBIS

Main reference

Cohen, D.M., T. Inada, T. Iwamoto and N. Scialabba. 1990. (Ref. 1371)
Other references | Biblio | Coordinator | Collaborators

Size / Weight / Age

Max length : 91.0 cm TL male/unsexed; (Ref. 2850); max. published weight: 1,400 g (Ref. 9988); max. reported age: 15 years (Ref. 1371)

Environment

Benthopelagic; non-migratory; brackish; marine; depth range 0 - 1280 m (Ref. 50550)

Climate / Range

Polar; 68°N - 34°N, 129°E - 120°W (Ref. 54255)

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.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description

Dorsal spines (total): 0; Dorsal soft rays (total): 38 - 48; Anal spines: 0; Anal soft rays: 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.

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. The roe 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). The Bering Sea/Aleutian Islands (BS/AI), http://www.msc.org/html/content_1176.htm, and Gulf of Alaska (GOA), http://www.msc.org/html/content_492.htm, pollock fisheries of this species have been certified by the Marine Stewardship Council (http://www.msc.org/) as well-managed and sustainable.


IUCN Red List Status (Ref. 57073)	Threat to humans
Not Evaluated	Harmless

Human uses
Fisheries: highly commercial


More information
Countries FAO areas Ecosystems Occurrences Introductions Ecology Diet Food items Food consumption Ration	Common names Synonyms Metabolism Predators Ecotoxicology Reproduction Maturity Spawning Eggs Egg development	Age/Size Growth Length-weight Length-length Length-frequencies Morphometrics Morphology Larvae Larval dynamics Recruitment	Other references Biblio Aquaculture Aquaculture profile Strains Genetics Allele frequencies Heritability Diseases Processing	Collaborators Pictures Stamps Sounds Ciguatera Speed Swim. type Gill area Otoliths Brains Vision

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Internet sources

Estimation of some characteristics with mathematical models

Resilience (Ref. 69278)

Low, minimum population doubling time 4.5 - 14 years (Musick et al. 2000 (Ref. 36717))


Vulnerability (Ref. 59153)	Price category (Ref. 80766)
Moderate vulnerability (36 of 100)	Low

Entered by Luna, Susan M.

Modified by Pablico, Grace Tolentino

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Page last modified by : elaxamana, 15 July 2009

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