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    Age Validation of the Common Thresher Shark (Alopias vulpinus) in the Northeastern Pacific Ocean

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    SPEAR-THESIS-2017.pdf (1.149Mb)
    Date
    2017-05-30
    Author
    Spear, Natalie
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    Abstract
    The purpose of this study was to validate the vertebral band pair deposition rate for Common Threshers (Alopias vulpinus) in the northeastern Pacific Ocean (NEPO). Vertebrae of 37 Common Threshers marked with oxytetracycline (OTC) were collected from tag-recapture efforts and used in this study. OTC tagging occurred off southern California from 1998 through 2013, and time at liberty of the 37 sharks ranged from 0.53 to 3.81 years with an average of 1.27 years (± 0.15 standard error, SE). Shark size at time of injection with OTC ranged from 63 to 128 cm fork length (FL) and from 83 to 168 cm FL at recapture. Vertebral band pair counts distal to the OTC marks indicate one band pair (1 translucent and 1 opaque) form annually for Common Threshers of the size range examined in the NEPO. This finding supports previous age and growth assumptions that have formed the basis of management decisions for the Common Thresher, and will support population dynamics data analyses moving forward.
    URI
    http://hdl.handle.net/1969.1/165757
    Subject
    Common Thresher Shark
    Age and Growth
    OTC
    Oxytetracycline
    validation
    Alopias vulpinus
    Southern California Bight
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    • Electronic Theses, Dissertations, and Records of Study (2002– )
    Citation
    Spear, Natalie (2017). Age Validation of the Common Thresher Shark (Alopias vulpinus) in the Northeastern Pacific Ocean. Master's thesis, Texas A & M University. Available electronically from http : / /hdl .handle .net /1969 .1 /165757.

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