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首页> 外文期刊>Journal of Applied Ichthyology >Validation of mark-recapture population estimates for invasive common carp, Cyprinus carpio, in Lake Crescent, Tasmania.
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Validation of mark-recapture population estimates for invasive common carp, Cyprinus carpio, in Lake Crescent, Tasmania.

机译：塔斯马尼亚州新月湖的入侵鲤鱼鲤鱼捕获标记种群估计的验证。

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A mark-recapture study based on the Petersen method was implemented in 1998 to estimate the abundance of the invasive common carp, Cyprinus carpio L., in Lake Crescent, Tasmania. Multiple gear types were employed to minimise capture bias, with multiple capture and recapture events providing an opportunity to compute and compare Petersen and Schnabel estimates. A single Petersen estimate on recapture data and two Schnabel estimates - one each on mark (forward-Schnabel estimate) and recapture (reverse-Schnabel estimate) data - were conducted. An independent long-term double tag study facilitated estimation of the annual natural mortality. Subsequent fish-down of the population suggests that, in all likelihood, the carp have been eradicated from the lake, providing an unprecedented opportunity to verify the forward population estimates carried out in 1998. Results suggest that all three estimates were close to the true population size, with the reverse-Schnabel estimate being the most accurate and within 1% of the true population in this relatively large lake (~2365 ha). Greater accuracy of the reverse-Schnabel approach can be attributed to either minimised fish behavioural (i.e. gear susceptibility or avoidance) or computational bias associated with the forward-Schnabel and Petersen approaches, respectively. While the original estimates served as a guide in eradication of carp from the lake, the ultimate validation provides a reliable framework for abundance estimation of this invasive fish in relatively large water bodies elsewhere.
机译：1998年进行了一项基于Petersen方法的商标夺回研究，以估计塔斯马尼亚州新月湖的入侵鲤鱼（Cyprinus carpio L.）的丰度。采用了多种齿轮类型以最大程度地减小捕获偏差，并通过多次捕获和重新捕获事件来提供计算和比较Petersen和Schnabel估算值的机会。对重新捕获数据进行了一次Petersen估计，对两个Schnabel估计进行了评估-每个在标记（正向Schnabel估计）和重新捕获（反向Schnabel估计）数据上进行了估计。一项独立的长期双标签研究方便了对年度自然死亡率的估算。随后的大量鱼类捕捞表明，很可能鲤鱼已从湖中铲除，这为核实1998年进行的前瞻性种群估计提供了前所未有的机会。结果表明，这三个估计值均接近真实种群。在这个相对较大的湖泊（〜2365公顷）中，Schnabel的反向估计是最准确的，且不超过真实人口的1％。反向Schnabel方法的较高准确性可归因于分别与正向Schnabel方法和Petersen方法相关的最小化的鱼类行为（即渔具敏感性或回避）或计算偏差。虽然最初的估算值可以作为从湖中消灭鲤鱼的指南，但最终的验证为在其他地方相对较大的水域中对这种入侵鱼类的丰度估算提供了可靠的框架。

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