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Walleye pollock.jpg
Theragra chalcogramma
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Gadiformes
Family: Gadidae
Genus: Theragra
Lucas, 1898[1]
Type species
Theragra chalcogramma
(Pallas, 1814)

Theragra is a genus of fishes in the cod family Gadidae, specifically containing the Alaska pollock (Theragra chalcogramma) of the Northern Pacific Ocean. Another species included, the Norway pollock (Theragra finnmarchica) has proven not to be distinct from the Alaska pollock. Moreover, recent research suggests that T. chalcogramma is a sister taxon to the Atlantic cod (Gadus morhua), and Theragra should be considered a synonym of the genus name Gadus.[2][3] [4]


  • Cohen, D.M., Inada, T., Iwamoto, T. & Scialabba, N.. 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 Fisheries Synopsis”, s. 442, 1990


  1. ^ uBio
  2. ^ Byrkjedal, I.; D. J. Rees; Jørgen S. Christiansen; Svein-Erik Fevolden (2008-10-01). "The taxonomic status of Theragra finnmarchica Koefoed, 1956 (Teleostei: Gadidae): perspectives from morphological and molecular data". Journal of Fish Biology. 73 (5): 1183–1200. doi:10.1111/j.1095-8649.2008.01958.x. ISSN 1095-8649. 
  3. ^ Carr, Steven M.; H. Dawn Marshall (2008). "Phylogeographic analysis of complete mtDNA genomes from walleye pollock (Gadus chalcogrammus Pallas, 1811) shows an ancient origin of genetic biodiversity". Mitochondrial DNA. 19 (6): 490–496. doi:10.1080/19401730802570942. Retrieved 2012-03-24. 
  4. ^ Ursvik, Anita; Ragna Breines; Jørgen S. Christiansen; Svein-Erik Fevolden; Dag H. Coucheron; Steinar D. Johansen (2007-06-07). "A mitogenomic approach to the taxonomy of pollocks: Theragra chalcogramma and T. finnmarchica represent one single species". BMC Evolutionary Biology. 7 (1): 86. doi:10.1186/1471-2148-7-86. ISSN 1471-2148. PMC 1894972Freely accessible. PMID 17555567.