Validated age and growth of the dusky shark, Carcharhinus obscurus, from Western Australian waters

By C. Simpfendorfer, R. McAuley, J. Chidlow, P. Unsworth. 2002

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Reassessing the value of nursery areas to shark conservation and management (2009, background): “Estimates place the age at maturity for C. obscurus around 17–22 years for females (220–250 cm), and 20–23 years for males (230–243 cm) (Simpfendorfer et al. 2002).”
A method for evaluating the impacts of fishing mortality and stochastic influences on the demography of two long-lived shark stocks (2007, methodology): “…method, because the latter resulted in inconsistently high estimates of Mwt. Live weight-at-age was estimated from each species’ mean length-at-age (Simpfendorfer et al., 2002; McAuley et al., 2006) and the female relationships between length and live weight given by McAuley and Simpfendorfer…”
Age under-estimation in New Zealand porbeagle sharks (Lamna nasus): is there an upper limit to ages that can be determined from shark vertebrae? (2007, methodology): “The fitted curve had a form analogous to a von Bertalanffy curve forced through the length at birth (Simpfendorfer et al. 2002): A = A0 + (A∞ − A0)(1 − e−k(A′−A′0)) (2) where A is the age estimate from Reader 2, A0 is the origin on the age-estimate axis (= 20 years), A′ and A′0 (= 20 years) are the…”