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    Validated age and growth estimates for Carcharhinus obscurus in the northwestern Atlantic Ocean, with pre- and post management growth comparisons

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    art_10.1007_s10641-013-0189-4.pdf (750.8Kb)
    Date
    2013-11-19
    Author
    Natanson, Lisa J.  Concept link
    Gervelis, Brian J.  Concept link
    Winton, Megan V.  Concept link
    Hamady, Li Ling  Concept link
    Gulak, Simon J. B.  Concept link
    Carlson, John K.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6785
    As published
    https://doi.org/10.1007/s10641-013-0189-4
    DOI
    10.1007/s10641-013-0189-4
    Keyword
     Dusky shark; Age and growth; Elasmobranch; Vertebrae; Bomb radiocarbon; Validation 
    Abstract
    Age and growth estimates for the dusky shark, Carcharhinus obscurus, were derived from vertebral centra collected in the northwestern Atlantic Ocean. Sample collection spanned the years prior to and following the implementation of management measures (1963–2010). Growth was compared pre- and post- population depletion and pre- and post- management to investigate the possibility of density-mediated shifts in age and growth parameters over time. There was no evidence of difference between periods for either sex. Additionally, bomb radiocarbon dating was used to determine the periodicity of band pair formation. Results support the traditional interpretation of annual band pairs up to approximately 11 years of age. After this time, vertebral counts considerably underestimate true age. Maximum validated ages were estimated to be between 38 and 42 years of age (an increase of 15 to 19 years over the band count estimates), confirming longevity to at least 42 years of age. Growth curves estimated using only validated data were compared to those generated using band pair counts. Logistic growth parameters derived from validated vertebral length-at-age data were L ∞  = 261.5 cm FL, L o  = 85.5 cm, t o  = 4.89 year and g = 0.15 year−1 for the sexes combined. Revised estimates of age at maturity were 17.4 years for males and 17.6 years for females.
    Description
    This paper is not subject to U.S. copyright. The definitive version was published in Environmental Biology of Fishes 97 (2014): 881-896, doi:10.1007/s10641-013-0189-4.
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    • Biology
    Suggested Citation
    Environmental Biology of Fishes 97 (2014): 881-896
     

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