Animalia > Chordata > Actinopterygii > Gadiformes > Gadidae > Theragra > Theragra chalcogramma

Theragra chalcogramma (Whiting; Walleyed pollock; Wall-eye pullack; Walleye pollock; Pacific pollock; Alaskan pollock; Alaska pollock; Alaska pollack)

Synonyms: Gadus chalcogrammus; Gadus minor; Gadus periscopus; Pollachius chalcogrammus; Pollachius chalcogrammus fucensis; Theracra chalcogramma; Theragra chalcogrammus; Theragra chalcogrammus chalcogrammus; Theragra fucensis
Language: Alutiiq; Danish; Dutch; Finnish; French; German; Italian; Japanese; Korean; Mandarin Chinese; Norwegian; Polish; Portuguese; Russian; Spanish; Swedish

Wikipedia Abstract

The Alaska pollock or walleye pollock (Gadus chalcogrammus, formerly Theragra chalcogramma) is a marine fish species of the cod family Gadidae. Alaska pollock is a semipelagic schooling fish widely distributed in the North Pacific with largest concentrations found in the eastern Bering Sea.While belonging to the same family as the Atlantic pollock, the Alaska pollock is not a member of the same Pollachius genus.
View Wikipedia Record: Theragra chalcogramma


Adult Weight [2]  1.70 lbs (770 g)
Female Maturity [3]  3 years 6 months
Male Maturity [2]  3 years
Diet [1]  Carnivore
Maximum Longevity [3]  15 years
Nocturnal [1]  Yes
Water Biome [1]  Pelagic, Benthic, Coastal

Protected Areas

Name IUCN Category Area acres Location Species Website Climate Land Use
Aleutian Islands Biosphere Reserve 2720489 Alaska, United States    
Gwaii Haanas National Park Reserve II 366714 British Columbia, Canada
Mount Arrowsmith Biosphere Reserve 293047 British Columbia, Canada  
Pacific Rim National Park Reserve II 137900 British Columbia, Canada
Sikhote-Alinskiy Biosphere Reserve 978001 Russia  

Prey / Diet

Ammodytes hexapterus (Stout sand lance)[4]
Atheresthes stomias (Turbot)[4]
Chionoecetes opilio (snow crab)[4]
Clupea pallasii pallasii (Pacific herring)[4]
Crangon alaskensis[4]
Crangon dalli (ridged crangon)[4]
Engraulis japonicus (Japanese anchovy)[5]
Gadus macrocephalus (Pacific cod)[4]
Hippoglossoides elassodon (Paper sole)[4]
Hippoglossus stenolepis (Pacific halibut)[4]
Lepidopsetta polyxystra (Northern rock sole)[4]
Mallotus villosus (Capelin)[4]
Pandalus eous (Alaskan pink shrimp)[6]
Pandalus goniurus (humpy shrimp)[4]
Reinhardtius hippoglossoides (Turbot)[4]
Sardinops sagax (Australian pilchard)[5]
Theragra chalcogramma (Whiting)[4]
Thysanoessa inermis[4]
Thysanoessa raschii (Arctic krill)[4]

Prey / Diet Overlap

Competing SpeciesCommon Prey Count
Aechmophorus occidentalis (Western Grebe)2
Alcichthys elongatus3
Amblyraja radiata (Starry ray)2
Atheresthes evermanni (Kamchatka flounder)2
Atheresthes stomias (Turbot)4
Balaenoptera acutorostrata (Minke Whale)4
Balaenoptera borealis (Sei Whale)2
Balaenoptera physalus (Fin Whale)3
Bathyraja aleutica (Aleutian skate)3
Bathyraja interrupta (Sandpaper skate)2
Brachyramphus brevirostris (Kittlitz's Murrelet)2
Brachyramphus marmoratus (Marbled Murrelet)3
Callorhinus ursinus (Northern Fur Seal)2
Cepphus columba (Pigeon Guillemot)2
Cerorhinca monocerata (Rhinoceros Auklet)2
Clangula hyemalis (Oldsquaw)2
Dasycottus setiger (Spinyhead sculpin)2
Eumetopias jubatus (Steller Sea Lion)3
Fratercula cirrhata (Tufted Puffin)5
Fratercula corniculata (Horned Puffin)2
Fulmarus glacialis (Northern Fulmar)2
Gadus macrocephalus (Pacific cod)9
Gadus morhua (rock cod)2
Gymnocanthus intermedius (Sculpin)2
Hexagrammos otakii (Greenling)2
Hexagrammos stelleri (Greenling)4
Hippoglossoides elassodon (Paper sole)4
Hippoglossoides platessoides (American dab)2
Hippoglossus stenolepis (Pacific halibut)7
Lagenorhynchus obliquidens (Pacific White-sided Dolphin)3
Lepidopsetta polyxystra (Northern rock sole)3
Leptocottus armatus (Cabezon)2
Limanda aspera (Yellowfin sole)3
Macrourus berglax (smoothspined grenadier)2
Malacoraja senta (Smooth skate)2
Mallotus villosus (Capelin)2
Megaptera novaeangliae (Humpback Whale)3
Merluccius productus (Whiting)2
Metacarcinus magister (Dungeness crab)2
Myoxocephalus ochotensis (Okhotsk sculpin)2
Oncorhynchus clarkii (Cutthroat trout)2
Phalacrocorax pelagicus (Pelagic Cormorant)2
Phocoena phocoena (Harbor Porpoise)2
Physiculus japonicus (Japanese codling)2
Podiceps auritus (Horned Grebe)3
Podiceps grisegena (Red-necked Grebe)2
Raja binoculata (Big skate)2
Raja rhina (Longnose skate)2
Rissa tridactyla (Black-legged Kittiwake)6
Scomberomorus niphonius (Spotted Spanish mackerel)2
Sebastes flavidus (Yellowtail rockfish)2
Squalus acanthias (Common spiny)2
Sterna paradisaea (Arctic Tern)2
Synthliboramphus antiquus (Ancient Murrelet)2
Uria aalge (Common Murre)2


Albatrossia pectoralis (Pectoral rattail)[7]
Atheresthes evermanni (Kamchatka flounder)[8]
Atheresthes stomias (Turbot)[4]
Balaenoptera acutorostrata (Minke Whale)[9]
Balaenoptera physalus (Fin Whale)[9]
Bathyraja aleutica (Aleutian skate)[10]
Bathyraja maculata (White-blotched skate)[11]
Callorhinus ursinus (Northern Fur Seal)[9]
Cepphus columba (Pigeon Guillemot)[12]
Eumetopias jubatus (Steller Sea Lion)[9]
Fratercula cirrhata (Tufted Puffin)[13]
Gadus macrocephalus (Pacific cod)[4]
Haliaeetus pelagicus (Steller's Sea-Eagle)[14]
Hemilepidotus jordani (Yellow Irish lord)[15]
Hemitripterus bolini (Bigmouth sculpin)[15]
Hemitripterus villosus (Shaggy sculpin)[5]
Hexagrammos otakii (Greenling)[5]
Hippoglossoides dubius (Flathead flounder)[16]
Hippoglossoides elassodon (Paper sole)[4]
Hippoglossus stenolepis (Pacific halibut)[4]
Histriophoca fasciata (Ribbon Seal)[17]
Lamna ditropis (Salmon shark)[18]
Lepidopsetta polyxystra (Northern rock sole)[4]
Limanda aspera (Yellowfin sole)[4]
Megaptera novaeangliae (Humpback Whale)[9]
Myoxocephalus polyacanthocephalus (Sculpin)[19]
Phoca vitulina richardii (Harbor seal)[9]
Physiculus japonicus (Japanese codling)[5]
Pleurogrammus monopterygius (Atka mackerel)[20]
Reinhardtius hippoglossoides (Turbot)[4]
Rissa tridactyla (Black-legged Kittiwake)[9]
Somniosus pacificus (Pacific Sleeper Shark)[21]
Theragra chalcogramma (Whiting)[4]
Uria aalge (Common Murre)[9]


Parasitized by 
Abothrium gadi[22]
Amphilina coreana <Unverified Name>[22]
Anisakis simplex[22]
Aponurus sphaerolecithum <Unverified Name>[22]
Aporocotyle simplex[22]
Aporocotyle theragrae[22]
Bolbosoma caenoforme[22]
Bothriocephalus scorpii[22]
Brachyphallus crenatus[22]
Branchobdella pugetensis[22]
Contracaecum osculatum[22]
Copiatestes filiferus[22]
Corynosoma strumosum[22]
Corynosoma villosum[22]
Derogenes varicus[22]
Diphyllobothrium elegans[22]
Diphyllobothrium plerocercoid <Unverified Name>[22]
Echinorhynchus gadi[22]
Echinorhynchus leidyi[22]
Echinorhynchus theragrae[22]
Echinorhynchus yamagutii[22]
Grillotia erinaceus[22]
Grillotia heptanchi[22]
Hemiurus levinseni[22]
Lecithaster gibbosus[22]
Lecithophyllum botryophorum[22]
Lepidapedon gadi[22]
Lepidapedon microcotyleum <Unverified Name>[22]
Nybelinia surmenicola[22]
Opechona alaskensis[22]
Parahemiurus merus[22]
Podocotyle reflexa[22]
Podocotyle theragrae <Unverified Name>[22]
Prosorhynchoides basargini[22]
Pseudoterranova decipiens[22]
Pyramicocephalus phocarum[22]
Scolex pleuronectis <Unverified Name>[22]
Scolex polymorphus <Unverified Name>[22]
Steganoderma formosum[22]


Alaska (USA); Arctic Ocean; Beaufort Sea; California Current; Canada; China; Chukchi Sea; East Bering Sea; Gulf of Alaska; Japan; Korea, Dem. People's Rep; Korea, Republic of; Kuroshio Current; 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.; Pacific Ocean; Pacific, Eastern Central; Pacific, Northeast; Pacific, Northwest; Russian Federation; Sea of Japan; Sea of Okhotsk; Taiwan; USA (contiguous states); West Bering Sea;



Attributes / relations provided by 1Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2006. The Animal Diversity Web (online). Accessed February 01, 2010 at 2de Magalhaes, J. P., and Costa, J. (2009) A database of vertebrate longevity records and their relation to other life-history traits. Journal of Evolutionary Biology 22(8):1770-1774 3Frimpong, E.A., and P. L. Angermeier. 2009. FishTraits: a database of ecological and life-history traits of freshwater fishes of the United States. Fisheries 34:487-495. 4Groundfish Food Habits and Predation on Commercially Important Prey Species in the Eastern Bering Sea From 1997 Through 2001, Lang, G. M., P. A. Livingston, and K. A. Dodd, 2005, U.S. Dep. Comer., NOAA Tech. Memo. NMFS-AFSC-158, 230 p. 5Diets of the demersal fishes on the shelf off Iwate, northern Japan, T. Fujita, D. Kitagawa, Y. Okuyama, Y. Ishito, T. Inada, Y. Jin, Marine Biology (1995) 123:219-233 6Food habits of Pacific cod and walleye pollock in the northern Gulf of Alaska, Daniel Urban, Mar Ecol Prog Ser 469: 215–222, 2012 7Feeding of Albatrossia pectoralis (Macrouridae) on the Continental Slope of Eastern Kamchatka and the Kurils, V. V. Napazakov and V. I. Chuchukalo, Journal of Ichthyology, 2011, Vol. 51, No. 4, pp. 343–351 8MS Yang, PA Livingston, Food habits and diet overlap of two congeneric species, Athersthes stomias and Atheresthes evermanni, in the eastern Bering Sea NOAA Fishery Bulletin Vol. 84 No. 3, 1986 9Food Web Relationships of Northern Puget Sound and the Strait of Juan de Fuca : a Synthesis of the Available Knowledge, Charles A. Simenstad, Bruce S. Miller, Carl F. Nyblade, Kathleen Thornburgh, and Lewis J. Bledsoe, EPA-600 7-29-259 September 1979 10Diet and trophic ecology of skates in the Gulf of Alaska (Raja and Bathyraja spp.): ecological information for ecosystem–based management of demersal resources, David A. Ebert, Joseph J. Bizzarro, Simon C. Brown, Mariah D. Boyle, and Gregor M. Cailliet, NPRB Project 621 Final Report (2008) 11The Diets and Feeding Habits of Some Deep-Water Benthic Skates (Rajidae) in the Pacific Waters Off the Northern Kuril Islands and Southeastern Kamchatka, Alexei M. Orlov, Alaska Fishery Research Bulletin 5(1):1–17. 1998 12A COMPARISON OF THE BREEDING AND FEEDING ECOLOGY OF PIGEON GUILLEMOTS AT NAKED AND JACKPOT ISLANDS IN PRINCE WILLIAM SOUND, D. Lindsey Hayes, APEX: 95163 F. U.S. Fish and Wildlife Service, Anchorage, AK. (1996) 13HABITAT USE, DIET AND BREEDING BIOLOGY OF TUFTED PUFFINS IN PRINCE WILLIAM SOUND, ALASKA, John F. Piatt, Daniel D. Roby, Laird Henkel and Kriss Neuman, Northwestern Naturalist 78:102-109 (1997) 14Diet of the Steller’s Sea Eagle in the Northern Sea of Okhotsk, Irina UTEKHINA, Eugene POTAPOV & Michael J. MCGRADY, First Symposium on Steller’s and White-tailed Sea Eagles in East Asia pp. 71-82, 2000 15Life history traits of sculpins in the eastern Bering Sea and Aleutian Islands, Todd T. TenBrink and Kerim Y. Aydin, NPRB Project 628 Final Report (2009) 16Effects of hypoxia on principal prey and growth of flathead flounder Hippoglossoides dubius in Funka Bay, Japan, Kimura, Masafumi; Takahashi, Toyomi; Takatsu, Tetsuya; Nakatani, Toshikuni; Maeda, Tatsuaki; Fisheries Science, 70(4): 537-545 (2004) 17Alaska Wildlife Notebook Series, Alaska Department of Fish and Game 18Predation by Salmon Sharks (Lamna ditropis) on Pacific Salmon (Oncorhynchus spp.) in the North Pacific Ocean, Kazuya Nagasawa, NPAFC Bulletin No. 1 pp. 419-433 (1998) 19Feeding Interactions and Diet of Carnivorous Fishes in the Shelikhov Bay of the Sea of Okhotsk, V. V. Napazakov, Russian Journal of Marine Biology, 2008, Vol. 34, No. 7, pp. 452–460 20The trophic role of Atka mackerel, Pleurogrammus monopterygius, in the Aleutian Islands area, Mei-Sun Yang, Fish. Bull. 97(4):1047-1057 (1999) 21Diet of Pacific sleeper shark, Somniosus pacificus, in the Gulf of Alaska, Mei-Sun Yang and Benjamin N. Page, Fish. Bull. 97:406–409 (1999) 22Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London
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