Growth and sexual maturity of the northern propellerclam (<Emphasis Type="Italic">Cyrtodaria siliqua</Emphasis>) in Eastern Canada,with bomb radiocarbon age validation |
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Authors: | Raouf W Kilada Steven E Campana Dale Roddick |
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Institution: | (1) Population Ecology Division, Bedford Institute of Oceanography, Box 1006, Dartmouth, NS, B2Y 4A2, Canada |
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Abstract: | The northern propellerclam Cyrtodaria siliqua is a common bycatch in the Arctic surfclam, Mactromeris polynyma fishery on Banquereau Bank in Eastern Canada. Samples of the propellerclam from this exploited fishery were used to determine
the life history characteristics of the population. The age structure of the population is dominated by old animals to ages
exceeding 100 years. We validated the age estimates for the propellerclam through analysis of bomb-produced radiocarbon in
the shell growth increments deposited before, during and after the atmospheric atomic bomb testing periods of the 1950s and
1960s. Radiocarbon from shells with presumed birth dates between the late 1950s and 1970s clearly reflected the sharp increase
in oceanic radiocarbon attributable to previous nuclear testing, indicating that age estimates based on shell increment counts
are accurate. Estimates of von Bertalanffy growth parameters revealed that the growth rate of the population was relatively
rapid for the first 20 years of life, slowing down to very low growth rates thereafter. Sexual maturity was estimated as being
reached at 28.6 mm in length and 4.7 years in age. Size–weight morphometric relationships were also calculated. |
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