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Bomb dating and age determination of large pelagic sharks

Campana, Steven E.; Natanson, Lisa J.; Myklevoll, Sigmund
Journal article, Peer reviewed
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2002_450.pdf (559.3Kb)
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http://hdl.handle.net/11250/108697
Utgivelsesdato
2002
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Originalversjon
http://dx.doi.org/10.1139/F02-027
Sammendrag
Despite their notoriety and role as apex predators, the longevity of large pelagic sharks such as the porbeagle

(Lamna nasus) and shortfin mako (Isurus oxyrinchus) is unknown. Vertebral growth bands provide an accurate

indicator of age in young porbeagle, but age validation has never been reported for any large shark species past the age

of sexual maturity. Here, we report the first application of bomb radiocarbon as an age validation method for longlived

sharks based on date-specific incorporation of radiocarbon into vertebral growth bands. Our results indicate that

porbeagle vertebrae recorded and preserved a bomb radiocarbon pulse in growth bands formed during the 1960s.

Through comparison of radiocarbon assays in young, known-age porbeagle collected in the 1960s with the corresponding

growth bands in old porbeagle collected later, we confirm the validity of porbeagle vertebral growth band counts as

accurate annual age indicators to an age of at least 26 years. The radiocarbon signatures of porbeagle vertebral growth

bands appear to be temporally and metabolically stable and derived mainly from the radiocarbon content of their prey.

Preliminary radiocarbon assays of shortfin mako vertebrae suggest that current methods for determining shortfin mako

age are incorrect.
Tidsskrift
Canadian Journal of Fisheries and Aquatic Sciences

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