Oxytetracycline age validation of an adult shortfin mako shark Isurus oxyrinchus after 6 years at liberty |
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| Authors: | M. J. Kinney R. J. D. Wells S. Kohin |
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| Affiliation: | 1. Ocean Associates, Inc., Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, La Jolla, CA, U.S.A.;2. Department of Marine Biology, Texas A&M University at Galveston, Galveston, TX, U.S.A.;3. Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, La Jolla, CA, U.S.A. |
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| Abstract: | This study presents findings on an oxytetracycline injected adult male shortfin mako Isurus oxyrinchus recaptured in waters off of southern California after 6 years at liberty. During the period at liberty, the vertebral band‐pair deposition rate was validated at one per year. This result indicates that from a time at or near sexual maturity, male I. oxyrinchus in the north‐east Pacific Ocean exhibit a band‐pair deposition rate of one band pair per year, while deposition rates for juveniles in the area have been validated at two band pairs per year. |
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| Keywords: | band‐pair periodicity shifting deposition rate |
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