Similar life history traits in bull (Carcharhinus leucas) and pig-eye (C. amboinensis) sharks

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dc.contributor.authorTillett, BJen_AU
dc.contributor.authorMeekan, MGen_AU
dc.contributor.authorField, ICen_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorBradshaw, CJAen_AU
dc.date.accessioned2012-04-23T04:06:01Zen_AU
dc.date.available2012-04-23T04:06:01Zen_AU
dc.date.issued2011en_AU
dc.date.statistics2012-04-23en_AU
dc.description.abstractAppropriate management strategies for coastal regions require an understanding of how ecological similarities and differences among species shape ecosystem processes. Here, we tested whether morphological similarity equated to similar age and growth patterns in two common coastal sharks in northern Australia. Vertebrae of 199 pig-eye (Carcharhinus amboinensis) and 94 bull (C. leucas) sharks were sourced principally from commercial fisheries operating along the Northern Territory coastline during 2007-2009. We sectioned vertebrae to provide estimates of age of these animals. Model averaging results indicated female pig-eye sharks matured at 13 years and lived >30 years. Theoretical asymptotic length (L(infinity)) (+/-s.e.) was estimated to be 2672 (+/-11.94) mm with a growth coefficient (k) of 0.145 year(-1). Male pig-eye sharks matured slightly earlier than females (12 years) and survived >26 years. Theoretical asymptotic length for males (L(infinity)) (+/-s.e.) was also smaller (2540 +/- 13.056) mm and they grew faster (k = 0.161 year(-1)) than females. Bull sharks matured at 9.5 years and reached a maximum theoretical size (L(infinity)) (+/-s.e.) of 3119 mm (+/-9.803) with a similar growth coefficient (k = 0.158 year(-1)) to pig-eye sharks. Longevity of bull sharks was estimated to be more than 27 years. Our results indicate that these patterns of high longevity and slow growth are indicative of low resilience and high susceptibility to over-exploitation of these coastal sharks. © 2011, CSIRO Publishingen_AU
dc.identifier.citationTillett, B. J., Meekan, M. G., Field, I. C., Hua, Q., & Bradshaw, C. J. A. (2011). Similar life history traits in bull (Carcharhinus leucas) and pig-eye (C. amboinensis) sharks. Marine and Freshwater Research, 62(7), 850-860. doi:10.1071/MF10271en_AU
dc.identifier.govdoc4128en_AU
dc.identifier.issn1323-1650en_AU
dc.identifier.issue7en_AU
dc.identifier.journaltitleMarine and Freshwater Researchen_AU
dc.identifier.pagination850en_AU
dc.identifier.urihttp://dx.doi.org/10.1071/MF10271en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4182en_AU
dc.identifier.volume62en_AU
dc.language.isoenen_AU
dc.publisherCSIRO Publishingen_AU
dc.subjectIsotope datingen_AU
dc.subjectCarbon 14en_AU
dc.subjectValidationen_AU
dc.subjectGulf of Mexicoen_AU
dc.subjectIndian Oceanen_AU
dc.subjectEcosystemsen_AU
dc.titleSimilar life history traits in bull (Carcharhinus leucas) and pig-eye (C. amboinensis) sharksen_AU
dc.typeJournal Articleen_AU
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