Animalia > Arthropoda > Malacostraca > Euphausiacea > Euphausiidae > Thysanoessa > Thysanoessa raschii

Thysanoessa raschii (Arctic krill)

Wikipedia Abstract

Thysanoessa raschii, sometimes known as Arctic krill, is one of the most common euphausiid species of the subarctic and Arctic seas. They may reach 20–25 millimetres (0.8–1.0 in) long, and are sexually mature above 14 mm (0.6 in). T. raschii is a major prey item of several taxa, planktivorous fishes and marine mammals. It is also a common prey item of seabirds, including shearwaters. This species goes through a number of stages in its development. Roderick Macdonald defined the characteristics of fourteen stages, or 'furcilia'.
View Wikipedia Record: Thysanoessa raschii


Speed [1]  0.05 MPH (.022 m/s)

Prey / Diet

Apherusa glacialis[2]
Calanus finmarchicus[2]
Calanus glacialis[2]
Calanus hyperboreus[2]
Thysanoessa raschii (Arctic krill)[2]


Aethia psittacula (Parakeet Auklet)[2]
Alle alle (Little Auk)[2]
Amblyraja radiata (Starry ray)[2]
Anarhichas lupus (Wolffish)[2]
Anarhichas minor (Spotted wolf-fish)[2]
Atheresthes stomias (Turbot)[3]
Balaena mysticetus (bowhead whale)[2]
Balaenoptera acutorostrata (Minke Whale)[4]
Balaenoptera musculus (Blue Whale)[2]
Balaenoptera physalus (Fin Whale)[2]
Bathyraja interrupta (Sandpaper skate)[2]
Boreogadus saida (Polar cod)[2]
Brachyramphus marmoratus (Marbled Murrelet)[2]
Clupea harengus (Yawling)[5]
Clupea pallasii (Pacific herring)[2]
Cystophora cristata (Hooded Seal)[2]
Eutrigla gurnardus (Grey gurnard)[2]
Gadus chalcogrammus (Whiting)[6]
Gadus macrocephalus (Pacific cod)[2]
Gadus morhua (rock cod)[2]
Gaidropsarus argentatus (Treebearded rockling)[2]
Gonatus fabricii (boreoatlantic armhook squid)[2]
Gymnocanthus tricuspis (Arctic staghorn sculpin)[2]
Hippoglossoides platessoides (American dab)[2]
Lepidopsetta polyxystra (Northern rock sole)[2]
Lumpenus lampretaeformis (serpent blenny)[2]
Macrourus berglax (smoothspined grenadier)[2]
Mallotus villosus (Capelin)[7]
Megaptera novaeangliae (Humpback Whale)[2]
Merlangius merlangus (Whiting)[2]
Merluccius albidus (Offshore whiting)[5]
Micromesistius poutassou (Poutassou)[2]
Molva molva (Ling)[2]
Oncorhynchus keta (Calico salmon)[2]
Pagophilus groenlandicus (Harp Seal)[2]
Pandalus borealis (northern shrimp)[2]
Paralithodes camtschaticus (red king crab)[2]
Phocoena phocoena (Harbor Porpoise)[2]
Pleurogrammus monopterygius (Atka mackerel)[2]
Pleuronectes platessa (European plaice)[2]
Podothecus accipenserinus (Sturgeon-like sea-poacher)[2]
Pollachius pollachius (Pollock)[2]
Pollachius virens (Sillock)[2]
Ptychoramphus aleuticus (Cassin's Auklet)[2]
Puffinus tenuirostris (Short-tailed Shearwater)[2]
Pusa hispida (Ringed Seal)[2]
Rajella fyllae (Round ray)[2]
Rissa tridactyla (Black-legged Kittiwake)[4]
Scomber scombrus (Split)[2]
Sebastes aleutianus (Rougheye rockfish)[2]
Sebastes alutus (Snapper)[2]
Sebastes mentella (Redfish)[2]
Thysanoessa raschii (Arctic krill)[2]
Trisopterus esmarkii (Norway pout)[2]
Uria aalge (Common Murre)[2]
Uria lomvia (Thick-billed Murre)[2]
Zaprora silenus (Prowfish)[2]


Parasitized by 
Anisakis simplex[8]
Bolbosoma caenoforme[8]
Nybelinia surmenicola[8]



Attributes / relations provided by
1"Pelagic Fishes and Their Macroplankton Prey: Swimming Speeds", Sergey M. Ignatyev, Proceedings • Forage Fishes in Marine Ecosystems, Alaska Sea Grant College Program, AK-SG-97-01, 1997, p. 31-39
2Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
3MS 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
4Food 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
5Food of Northwest Atlantic Fishes and Two Common Species of Squid, Ray E. Bowman, Charles E. Stillwell, William L. Michaels, and Marvin D. Grosslein, NOAA Technical Memorandum NMFS-NE-155 (2000)
6Groundfish 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.
7Comparative analysis of the feeding ecology of two pelagic forage fishes: capelin Mallotus villosus and walleye pollock Theragra chalcogramma, Matthew T. Wilson, Christina M. Jump, Janet T. Duffy-Anderson, Mar Ecol Prog Ser 317: 245–258, 2006
8Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London
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