Bias, precision and validation of ageing 0+ European barbel Barbus barbus (L.) from their otoliths

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• 作者：Lorenzo Vilizzi (1175)
  Gordon H. Copp (2175) (3175) (4175)
  
• 关键词：Lapillus ; Sagitta ; Asteriscus ; Conservation
• 刊名：Central European Journal of Biology
• 出版年：2013
• 出版时间：July 2013
• 年：2013
• 卷：8
• 期：7
• 页码：654-661
• 全文大小：591KB
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• 作者单位：Lorenzo Vilizzi (1175)
  Gordon H. Copp (2175) (3175) (4175)
  
  1175. Murray-Darling Freshwater Research Centre, 3689, Wodonga, Vic, Australia
  2175. Salmon & Freshwater Team, Cefas, Pakefield Road, NR33 0HT, Lowestoft, Suffolk, UK
  3175. Centre for Conservation Ecology and Environmental Science, Bournemouth University, BH12 5BB, Poole, UK
  4175. Environmental and Life Sciences Graduate Program, Trent University, ON, K9J 7B8, Peterborough, Canada
  
• ISSN：1644-3632

文摘

The European barbel Barbus barbus L. is considered a ‘flag-species for river conservation and sport fishing, but it is increasingly threatened in its native range of distribution. To provide accurate age estimates during early life for appropriate management and conservation measures, the bias and precision of otolith (daily) micro-increment counts were evaluated and age determinations validated on laboratory-reared embryos and larvae. Out of the three pairs of otoliths, the lapillus and sagitta provided reliable age estimates for free embryos and larvae up to 17 days of (known) age post-fertilisation, with first micro-increment formation occurring five days postfertilisation. On the other hand, micro-increments on asterisci formed only 16-7 days post-fertilisation. There was agreement in microincrement counts based on lapilli and sagittae, but not between interpreters, indicating that despite consistency between the two pairs of otoliths extensive training and experience are required for reliable age interpretation. The ability to estimate the ages of 0+ B. barbus from their otoliths will contribute to a better understanding of growth rates from both hatchery-stocked and native/introduced cohorts.