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

Bree Tillett, Mark Meekan, Iain Field, Quan Hua, Corey Bradshaw

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Appropriate 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) (±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) (±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) (±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.
    Original languageEnglish
    Pages (from-to)850-860
    Number of pages11
    JournalMarine and Freshwater Research
    Volume62
    Issue number7
    DOIs
    Publication statusPublished - 25 Jul 2011

    Fingerprint

    Leucas
    Sharks
    Carcharhinus
    shark
    life history trait
    sharks
    pig
    bulls
    Swine
    eyes
    life history
    swine
    Growth
    vertebrae
    Spine
    Northern Territory
    Fisheries
    Life History Traits
    animal age
    interspecific variation

    Cite this

    Tillett, Bree ; Meekan, Mark ; Field, Iain ; Hua, Quan ; Bradshaw, Corey. / Similar life history traits in bull (Carcharhinus leucas) and pig-eye (C. amboinensis) sharks. In: Marine and Freshwater Research. 2011 ; Vol. 62, No. 7. pp. 850-860.
    @article{3649ac6d7cc24a07a7e31db3b4736d5d,
    title = "Similar life history traits in bull (Carcharhinus leucas) and pig-eye (C. amboinensis) sharks",
    abstract = "Appropriate 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∞) (±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∞) (±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∞) (±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.",
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    author = "Bree Tillett and Mark Meekan and Iain Field and Quan Hua and Corey Bradshaw",
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    Similar life history traits in bull (Carcharhinus leucas) and pig-eye (C. amboinensis) sharks. / Tillett, Bree; Meekan, Mark; Field, Iain; Hua, Quan; Bradshaw, Corey.

    In: Marine and Freshwater Research, Vol. 62, No. 7, 25.07.2011, p. 850-860.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Similar life history traits in bull (Carcharhinus leucas) and pig-eye (C. amboinensis) sharks

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    AU - Bradshaw, Corey

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    AB - Appropriate 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∞) (±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∞) (±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∞) (±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.

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