AnAge entry for Halichoerus grypus

Classification (HAGRID: 02673)

Taxonomy
Kingdom: Animalia
    Phylum: Chordata
        Class: Mammalia (Taxon entry)
            Order: Carnivora
                Family: Phocidae
                    Genus: Halichoerus
Species
Halichoerus grypus
Common name
Gray seal

Lifespan, ageing, and relevant traits

Maximum longevity
42.9 years (captivity)
Source
ref. 671
Sample size
Medium
Data quality
Acceptable
Observations

After a 100 days period of delayed implantation, the active gestation lasts 240 days [0443]. In the wild, it has been estimated that females live up to 46 years [0573], which is dubious. Record longevity in captivity is 42.9 years [0671].

Life history traits (averages)

Female sexual maturity
1,460 days
Male sexual maturity
1,887 days
Gestation
240 days
Weaning
19 days
Litter size
1 (viviparous)
Litters per year
0.9
Inter-litter interval
365 days
Weight at birth
14,000 g
Weight at weaning
41,450 g
Adult weight
268,000 g
Postnatal growth rate
Maximum longevity residual
129%

Metabolism

No information on metabolism is available.

References

External Resources

Integrated Taxonomic Information System
ITIS 180653
Animal Diversity Web
ADW account
Encyclopaedia of Life
Search EOL
NCBI Taxonomy
Taxonomy ID 9711
Entrez
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Ageing Literature
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Internet
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