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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on October 24, 2006
ICES Journal of Marine Science: Journal du Conseil 2007 64(1):31-38; doi:10.1093/icesjms/fsl001
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© 2006 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Validated age, growth, and mortality estimates of the ocean quahog (Arctica islandica) in the western Atlantic

Raouf W. Kilada, Steven E. Campana and Dale Roddick

Population Ecology Division, Bedford Institute of Oceanography, PO Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada

Correspondence to R. W. Kilada: tel: +1 902 426 6350; fax: +1 902 426 1506; e-mail: kiladar{at}mar.dfo-mpo.gc.ca

Kilada, R. W., Campana S. E., and Roddick, D. 2007. Validated age, growth, and mortality estimates of the ocean quahog (Arctica islandica) in the western Atlantic. ICES Journal of Marine Science, 64: 31–38.

The age structure of offshore (Sable Bank) and inshore (St Mary's Bay) populations of eastern Canadian ocean quahogs (Arctica islandica), and of a northwestern Iceland population, is investigated. Age estimates for eastern Canadian ocean quahogs were validated through analysis of bomb-produced 14C in quahog shell growth increments deposited before, during, and after the atmospheric atomic bomb testing periods of the 1950s and 1960s. Delta 14C from shells with presumed birthdates between the late 1950s and 1970s clearly reflects the sharp increase in oceanic radiocarbon attributable to nuclear testing. The results validate our age interpretations of Sable Bank quahogs to an age of 45 y, and support longevity estimates of more than 200 y for the same population. Longevity calculations for the other populations exceeded 60 y. Von Bertalanffy growth parameters were estimated for the three populations; the growth rate of all three was relatively rapid for the first 20–30 y of life, but thereafter was very slow. The instantaneous rate of natural mortality (M), calculated using the age–frequency distribution of the unexploited populations, was estimated to be 0.03 and 0.10 for the Sable Bank and St Mary's Bay populations, respectively.

Keywords: age determination, Arctica islandica, bomb radiocarbon, ocean quahog validation


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