Abstract
Age and growth estimates were determined for the sandbar shark, Carcharhinus plumbeus, from Oahu, Hawaii in the central Pacific Ocean. Age estimates were obtained through vertebral centra analysis of 187 sharks. We verified our age estimates through marginal increment analysis of centra and oxytetracycline marking methods of at liberty sandbar sharks. Sizes of sampled sharks ranged from 46 to 147 cm pre-caudal length. Four growth models were fitted to length-at-age data; two forms of the von Bertalanffy growth model, the Gompertz growth model, and a logistic growth model. Males and females exhibited statistically significant differences in growth, indicating that females grow slower and attain larger sizes than males. Growth parameter estimates revealed slower growth rates than previously estimated (based on captive specimens) for Hawaiian sandbar sharks. The von Bertalanffy growth model using empirical length-at-birth provided the best biological and statistical fit to the data. This model gave parameter estimates of L ∞ = 138.5 cm PCL and k = 0.12 year−1 for males and L ∞ = 152.8 cm PCL, k = 0.10 year−1 for females. Male and female sandbar sharks mature at approximately 8 and 10 years of age, respectively.
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Romine, J.G., Grubbs, R.D., Musick, J.A. (2006). Age and growth of the sandbar shark, Carcharhinus plumbeus, in Hawaiian waters through vertebral analysis. In: Carlson, J.K., Goldman, K.J. (eds) Special Issue: Age and Growth of Chondrichthyan Fishes: New Methods, Techniques and Analysis. Developments in Environmental Biology of Fishes, vol 25. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5570-6_3
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DOI: https://doi.org/10.1007/978-1-4020-5570-6_3
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