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 colour, 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


Gestation [3]  8 months
Litter Size [3]  1
Litters / Year [3]  1
Migration [1]  Interoceanic
Water Biome [1]  Coastal
Weaning [3]  7 days
Adult Weight [2]  507.066 lbs (230.00 kg)
Birth Weight [3]  39.683 lbs (18.00 kg)
Female Weight [2]  352.741 lbs (160.00 kg)
Male Weight [2]  661.39 lbs (300.00 kg)
Weight Dimorphism [2]  87.5 %
Diet [4]  Carnivore (Invertebrates), Piscivore
Diet - Fish [4]  80 %
Diet - Invertibrates [4]  20 %
Forages - Marine [4]  100 %
Female Maturity [3]  3 years
Male Maturity [3]  5 years

Protected Areas

Prey / Diet

Prey / Diet Overlap


Somniosus microcephalus (gray shark)[8]


Range Map


North America;

External References



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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