Animalia > Chordata > Mammalia > Carnivora > Phocidae > Cystophora > Cystophora cristata

Cystophora cristata (Hooded Seal; bladdernose seal)

Language: French

Wikipedia Abstract

The hooded seal (Cystophora cristata) is a large phocid found only in the central and western North Atlantic, ranging from Svalbard in the east to the Gulf of St. Lawrence in the west. The seals are typically silver-grey in color, with black spots that vary in size covering most of the body. Hooded seal pups are known as "blue-backs" because their coats are blue-grey on the back with whitish bellies, though this coat is shed after 14 months of age when the pups molt.
View Wikipedia Record: Cystophora cristata

EDGE Analysis

Uniqueness Scale: Similiar (0) 
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
 Unique & Vulnerable (100)
ED Score: 14.31
EDGE Score: 4.11


Adult Weight [2]  507.07 lbs (230.00 kg)
Birth Weight [3]  39.68 lbs (18.00 kg)
Female Weight [2]  352.74 lbs (160.00 kg)
Male Weight [2]  661.39 lbs (300.00 kg)
Weight Dimorphism [2]  87.5 %
Female Maturity [3]  3 years
Male Maturity [3]  5 years
Diet [4]  Carnivore (Invertebrates), Piscivore
Diet - Fish [4]  80 %
Diet - Invertibrates [4]  20 %
Forages - Marine [4]  100 %
Gestation [3]  8 months
Litter Size [3]  1
Litters / Year [3]  1
Migration [1]  Interoceanic
Water Biome [1]  Coastal
Weaning [3]  7 days

Protected Areas

Name IUCN Category Area acres Location Species Website Climate Land Use
Arctic National Wildlife Refuge Ib 12402936 Alaska, United States
Auyuittuq National Park II 4808115 Nunavut, Canada
Cape Breton Highlands National Park II 234333 Nova Scotia, Canada  
Cape Cod National Seashore II 21724 Massachusetts, United States
North-east Greenland National Park II 237590314 Greenland
Prince Edward Island National Park II   Prince Edward Island, Canada  
Quttinirpaaq (Ellesmere Island) National Park Reserve II 9436606 Nunavut, Canada
Sirmilik National Park II 5475284 Canada
Terra Nova National Park IV 125894 Newfoundland, Canada

Prey / Diet

Anarhichas denticulatus (Northern wolffish)[5]
Anarhichas lupus (Wolffish)[5]
Anarhichas minor (Spotted wolf-fish)[5]
Boreogadus saida (Polar cod)[5]
Clupea harengus (Yawling)[6]
Gadus morhua (rock cod)[5]
Gonatus fabricii (boreoatlantic armhook squid)[7]
Hippoglossoides platessoides (American dab)[5]
Liparis gibbus (Dusky snailfish)[5]
Liparis montagui (Montagu's sea-snail)[5]
Mallotus villosus (Capelin)[6]
Melanogrammus aeglefinus (Smokie)[6]
Pandalus borealis (northern shrimp)[5]
Pollachius virens (Sillock)[5]
Pseudopleuronectes americanus (rough flounder)[6]
Reinhardtius hippoglossoides (Turbot)[6]
Sebastes mentella (Redfish)[5]
Themisto abyssorum[5]
Themisto libellula[5]
Thysanoessa inermis[5]
Thysanoessa longicaudata[5]
Thysanoessa raschii (Arctic krill)[5]

Prey / Diet Overlap

Competing SpeciesCommon Prey Count
Alca torda (Razorbill)1
Amblyraja hyperborea (Arctic skate)2
Balaenoptera acutorostrata (Minke Whale)3
Balaenoptera borealis (Sei Whale)1
Balaenoptera physalus (Fin Whale)1
Boreogadus saida (Polar cod)1
Brachyramphus brevirostris (Kittlitz's Murrelet)1
Brachyramphus marmoratus (Marbled Murrelet)2
Cepphus grylle (Black Guillemot)1
Cerorhinca monocerata (Rhinoceros Auklet)1
Delphinapterus leucas (Beluga)1
Erignathus barbatus (Bearded Seal)1
Fratercula arctica (Atlantic Puffin)2
Fratercula cirrhata (Tufted Puffin)2
Fratercula corniculata (Horned Puffin)1
Fulmarus glacialis (Northern Fulmar)1
Globicephala melas (Long-finned Pilot Whale)3
Halichoerus grypus (Gray Seal)1
Hexagrammos stelleri (Greenling)1
Hippoglossoides platessoides (American dab)2
Histriophoca fasciata (Ribbon Seal)2
Hyperoodon ampullatus (Northern Bottlenose Whale)1
Lagenorhynchus acutus (Atlantic White-sided Dolphin)2
Lagenorhynchus albirostris (White-beaked Dolphin)3
Larus argentatus (Herring Gull)1
Larus canus (Mew Gull)1
Larus glaucescens (Glaucous-winged Gull)1
Larus marinus (Great Black-backed Gull)1
Megaptera novaeangliae (Humpback Whale)1
Monodon monoceros (Narwhal)1
Morus bassanus (Northern Gannet)2
Orcinus orca (Killer Whale)1
Pagophilus groenlandicus (Harp Seal)3
Phalacrocorax auritus (Double-crested Cormorant)2
Phalacrocorax carbo (Great Cormorant)1
Phoca largha (Spotted Seal)1
Phoca vitulina (Harbor Seal)1
Phocoena phocoena (Harbor Porpoise)3
Physeter macrocephalus (Sperm Whale)1
Pollachius virens (Sillock)2
Pusa hispida (Ringed Seal)1
Reinhardtius hippoglossoides (Turbot)2
Rissa tridactyla (Black-legged Kittiwake)1
Sebastes mentella (Redfish)1
Somniosus microcephalus (gray shark)3
Stercorarius parasiticus (Parasitic Jaeger)1
Uria aalge (Common Murre)2
Uria lomvia (Thick-billed Murre)1
Urophycis chuss (Squirrel hake)1


Somniosus microcephalus (gray shark)[8]


Parasitized by 
Acanthocheilonema spirocauda <Unverified Name>[9]
Anisakis simplex[9]
Anophryocephalus anophrys[9]
Bordetella bronchiseptica (Kennel cough)[10]
Contracaecum osculatum[9]
Corynosoma hadweni[9]
Corynosoma semerme[9]
Dipetalonema spirocauda[9]
Diphyllobothrium elegans[9]
Diphyllobothrium lanceolatum[9]
Diphyllobothrium latum[9]
Diphyllobothrium pterocephalum <Unverified Name>[9]
Diphyllobothrium tetrapterus[9]
Dirofilaria immitis (Heartworm)[9]
Dirofilaria spirocauda <Unverified Name>[9]
Echinophthirius horridus[5]
Filaroides gymnurus <Unverified Name>[9]
Metorchis albidus[9]
Opisthorchis tenuicollis[9]
Orthosplanchnus arctica <Unverified Name>[9]
Orthosplanchnus arcticus[9]
Otostrongylus circumlitus <Unverified Name>[9]
Phocascaris cystophorae <Unverified Name>[9]
Phocascaris phocae <Unverified Name>[9]
Pseudamphistomum truncatum[9]
Pseudoterranova decipiens[9]
Pyramicocephalus phocarum[9]
Yersinia enterocolitica (Y. enterocolitica)[10]

Range Map

North America;



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
2Cystophora cristata, Kit M. Kovacs and D. M. Lavigne, MAMMALIAN SPECIES No. 258, pp. –9 (1986)
3de 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
4Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014. EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027
5Jorrit 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.
6Estimated Fish Consumption by Hooded Seals (Cystophora cristata), in the Gulf of St. Lawrence, M. O. Hammill, C. Lydersen, K. M. Kovacs and B. Sjare, J. Northw. Atl. Fish. Sci., Vol. 22: 249–257 (1997)
7CephBase - Cephalopod (Octopus, Squid, Cuttlefish and Nautilus) Database
8McMeans, Bailey C., et al. "The role of Greenland sharks (Somniosus microcephalus) in an Arctic ecosystem: assessed via stable isotopes and fatty acids." Marine Biology 160.5 (2013): 1223+. Academic OneFile. Web. 14 July 2014.
9Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London
10Nunn, C. L., and S. Altizer. 2005. The Global Mammal Parasite Database: An Online Resource for Infectious Disease Records in Wild Primates. Evolutionary Anthroplogy 14:1-2.
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Abstract provided by DBpedia licensed under a Creative Commons License
Weather provided by NOAA METAR Data Access