Life-history traits of a small-bodied coastal shark
Adrian N. Gutteridge A B F , Charlie Huveneers C D , Lindsay J. Marshall E , Ian R. Tibbetts A and Mike B. Bennett B
+ Author Affiliations
- Author Affiliations
A School of Biological Sciences, University of Queensland, St Lucia, Brisbane, Qld 4072, Australia.
B School of Biomedical Sciences, University of Queensland, St Lucia, Brisbane, Qld 4072, Australia.
C School of Biological Sciences, Flinders University, Sturt Road, Bedford Park, Adelaide, SA 5042, Australia.
D Threatened, Protected and Endangered Species Program, South Australia Research and Development Institute – Aquatic Sciences, West Beach, Adelaide, SA 5024, Australia.
E Stickfigurefish Biological Illustrations, 47 Hunter Street, Everton Park, Brisbane, Qld 4053, Australia.
F Corresponding author. Email: gutteridge.adrian@gmail.com
Marine and Freshwater Research 64(1) 54-65 https://doi.org/10.1071/MF12140
Submitted: 22 May 2012 Accepted: 2 November 2012 Published: 6 February 2013
Abstract
The life histories of small-bodied coastal sharks, particularly carcharhinids, are generally less conservative than those of large-bodied species. The present study investigated the life history of the small-bodied slit-eye shark, Loxodon macrorhinus, from subtropical Hervey Bay, Queensland, and compared this species' biology to that of other coastal carcharhinids. The best-fit age model provided parameters of L∞ = 895 mm total length (TL), k = 0.18 and t0 = –6.3 for females, and L∞ = 832 mm TL, k = 0.44 and t0 = –2.6 for males. For sex-combined data, a logistic function provided the best fit, with L∞ = 842 mm TL, k = 0.41 and α = –2.2. Length and age at which 50% of the population was mature was 680 mm TL and 1.4 years for females, and 733 mm TL and 1.9 years for males. Within Hervey Bay, L. macrorhinus exhibited an annual seasonal reproductive cycle, producing an average litter of 1.9 ± 0.3 s.d. With the exception of the low fecundity and large size at birth relative to maximum maternal TL, the life-history traits of L. macrorhinus are comparable to other small-bodied coastal carcharhinids, and its apparent fast growth and early maturation contrasts that of large-bodied carcharhinids.
Additional keywords: age and growth, Australia, Carcharhinidae, elasmobranch, Loxodon macrorhinus, reproductive biology, slit-eye shark, subtropical.
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