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首页> 外文期刊>ICES Journal of Marine Science >Age and growth parameters for three heavily exploited shark species off temperate eastern Australia
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Age and growth parameters for three heavily exploited shark species off temperate eastern Australia

机译：澳大利亚东部温带海域三种重度开发的鲨鱼种类的年龄和生长参数

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摘要

The removal of large predatory sharks from the world's oceans poses profound threats to marine community structure and species conservation. Effective management of exploited shark stocks requires a sound understanding of the life histories of target species. Here we provide the first assessment of age and growth for Carcharhinus brevipinna in Australian waters, and for C obscurus and C. plumbeus in eastern Australian waters, based on interpretations of vertebral growth bands. In doing so, we provide arguably among the most robust growth parameters to date for the abovementioned taxa on the bases of genetic validation and sample size and distribution, but acknowledge equally a range of limitations-most notably those associated with vertebral ageing and our lack of age validation. Comparatively, the three species displayed both contrasts and consistencies in their growth characteristics off Australia's southeast coast. For all three sharks, rates of growth were greatest in the years immediately after birth, males grew more rapidly than females in the juvenile phase, and females were observed to grow larger, live longer and were generally larger at any given age. Longevity and all modelled growth parameters (L_∞, k and L_0), however, differed among the three species, and appeared to challenge the findings for conspecific populations in other parts of the world. The validity of these latter comparisons is, however, compromised by a range of confounding factors. Nevertheless, we provide the least conservative k estimates for C. obscurus and C. plumbeus of those previously reported, and extend maximum age estimates for C. brevipinna. In this way, our results have important implications for the assessment of natural mortality, productivity, and hence resilience to stock depletion, in these species in southeastern Australian waters.
机译：从世界海洋中清除大型掠食性鲨鱼对海洋生物群落结构和物种保护构成了深远的威胁。有效地管理鲨鱼种群需要对目标物种的生活史有深刻的了解。在这里，我们根据椎骨生长带的解释，对澳大利亚水域的短角真鲨属，澳大利亚东部水域的暗纹隐孢子虫和铅酸角衣虾的年龄和生长情况进行了首次评估。在这样做的过程中，我们可以根据遗传验证，样本大小和分布为上述分类群提供迄今为止最强劲的增长参数，但同样要承认一系列局限性，尤其是与椎骨老化有关的局限性以及我们缺乏年龄验证。比较而言，这三个物种在澳大利亚东南沿海以外的生长特征中既表现出对比又具有一致性。对于这三只鲨鱼，刚出生后的几年中增长率最高，在幼年期，雄性比雌性增长更快，并且观察到雌性在任何给定年龄下都长得更大，寿命更长并且通常更大。然而，这三个物种的寿命和所有模拟的生长参数（L_∞，k和L_0）不同，并且似乎挑战了世界其他地区特定种群的发现。但是，这些后一种比较的有效性受到一系列混杂因素的影响。不过，我们提供了先前报道的暗中隐孢子虫和羽状隐孢子虫的最不保守的k估计值，并扩展了短隐隐孢子虫的最大年龄估计数。这样，我们的结果对于评估澳大利亚东南水域这些物种的自然死亡率，生产力以及因此对种群枯竭的恢复能力具有重要意义。

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  • 来源
    《ICES Journal of Marine Science》 |2014年第3期|559-573|共15页
  • 作者

    Pascal T.Geraghty; William G. Macbeth; Alastair V. Harry; Jacqueline E. Bell; Michelle N. Yerman; Jane E. Williamson;

  • 作者单位

    Department of Biological Sciences, Faculty of Science, Macquarie University, NSW 2109, Australia,NSW Department of Primary Industries, Cronulla Fisheries Research Centre of Excellence, PO Box 21, Cronulla, NSW 2230, Australia;

    NSW Department of Primary Industries, Cronulla Fisheries Research Centre of Excellence, PO Box 21, Cronulla, NSW 2230, Australia;

    Centre for Sustainable Tropical Fisheries and Aquaculture, and School of Earth and Environmental Sciences, James Cook University, Townsville, QLD 4811, Australia;

    Department of Biological Sciences, Faculty of Science, Macquarie University, NSW 2109, Australia;

    NSW Department of Primary Industries, Cronulla Fisheries Research Centre of Excellence, PO Box 21, Cronulla, NSW 2230, Australia;

    Department of Biological Sciences, Faculty of Science, Macquarie University, NSW 2109, Australia;

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  • 正文语种 eng
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  • 关键词

    asymptotic growth models; Carcharhinidae; dusky shark; fishery management; sandbar shark; spinner shark; vertebral ageing;

    机译：渐近增长模型;char科昏暗的鲨鱼渔业管理;沙鲨旋转鲨椎体老化;

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