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首页> 外文期刊>North American Journal of Fisheries Management >Influence of Sectioning Location on Age Estimates from Common Carp Dorsal Spines
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Influence of Sectioning Location on Age Estimates from Common Carp Dorsal Spines

机译：切片位置对鲤鱼背刺年龄估计的影响

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摘要

Dorsal spines have been shown to provide precise age estimates for Common Carp Cyprinus carpio and are commonly used by management agencies to gain information on Common Carp populations. However, no previous studies have evaluated variation in the precision of age estimates obtained from different sectioning locations along Common Carp dorsal spines. We evaluated the precision, relative readability, and distribution of age estimates obtained from various sectioning locations along Common Carp dorsal spines. Dorsal spines from 192 Common Carp were sectioned at the base (section 1), immediately distal to the basal section (section 2), and at 25% (section 3), 50% (section 4), and 75% (section 5) of the total length of the dorsal spine. The exact agreement and within-1-year agreement among readers was highest and the coefficient of variation lowest for section 2. In general, age estimates derived from sections 2 and 3 had similar age distributions and displayed the highest concordance in age estimates with section 1. Our results indicate that sections taken at = 25% of the total length of the dorsal spine can be easily interpreted and provide precise estimates of Common Carp age. The greater consistency in age estimates obtained from section 2 indicates that by using a standard sectioning location, fisheries scientists can expect age-based estimates of population metrics to be more comparable and thus more useful for understanding Common Carp population dynamics.
机译：已显示背脊能够为鲤科鲤提供准确的年龄估计，管理机构通常使用背脊来获得鲤科种群的信息。然而，以前的研究都没有评估从沿共同鲤鱼背刺的不同切片位置获得的年龄估计精度的变化。我们评估了从沿鲤鱼背刺的各个切片位置获得的年龄估计的准确性，相对可读性和分布。在底部（第1部分），紧邻基底部分（第2部分）的远侧，分别以25％（第3部分），50％（第4部分）和75％（第5部分）的底部切开来自192个鲤鱼的背棘。背脊的总长度。读者之间的确切一致性和1年内一致性最高，而第2部分的变异系数最低。总体而言，从第2部分和第3部分得出的年龄估计具有相似的年龄分布，并且与第1部分显示出最高的一致性。我们的研究结果表明，以小于等于背脊总长度的25％截取的切片很容易解释，并可以准确估算出鲤鱼的年龄。从第2节获得的年龄估计值具有更大的一致性，这表明通过使用标准的切片位置，渔业科学家可以期望基于年龄的种群指标估计值更具可比性，因此对于理解鲤鱼种群动态更为有用。

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