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首页> 外文期刊>The Open Fish Science Journal >When Do Mountain Whitefish (Prosopium williamsoni) Spawn? A Comparison of Estimates Based on Gonadosomatic Indices and Spawner and Egg Counts
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When Do Mountain Whitefish (Prosopium williamsoni) Spawn? A Comparison of Estimates Based on Gonadosomatic Indices and Spawner and Egg Counts

机译：什么时候山白鲑（沃科米亚斯科尼）产卵？基于促性腺指数和鸡蛋计数的估计比较

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Determining when fish spawn has major implications for effective fisheries management, particularly in dam-controlled rivers where reproductive potential may be affected by an altered hydrograph. Three methods for estimating spawn timing in riverine broadcast spawners were compared for their precision, effort and potential impact on a population of Mountain Whitefish in the regulated Lower Duncan River, Canada. The first method is based on the Gonadosomatic Index (GSI), which is a measure of the relative mass of an individual’s gonads. The second method is based on counts of aggregating adults, while the third method is based on passive egg collection using egg mats. Analysis of the GSI data provided the most precise estimates. It estimated that spawning occurred between October 30th and November 26th in 2010 and between November 8th and November 27th in 2011. Collection of GSI data required moderate effort and had some impact due to the need for lethal harvest. Analysis of the spawner counts using a simple Bayesian Area-Under-the-Curve model provided less precise estimates of spawn timing but the method likely had negligible impact on the population and required only moderate effort. Deployment of egg mats required high effort and collected insufficient information to derive statistical estimates of spawn timing. We discuss how information from different methods could be combined together into a single integrated model to maximize the precision while minimizing the effort and impact.
机译：确定何时捕鱼何时对有效渔业管理具有重大影响，特别是在大坝控制的河流中，其中生殖潜力可能受到改变的水文的影响。比较了三种估算河流广播产量的三种方法，并对加拿大监管的下邓肯河山白鲑人口的精确度，努力和潜在影响。第一种方法基于促性腺指数（GSI），其是个体性腺的相对质量的量度。第二种方法基于聚集成人的计数，而第三种方法是基于使用蛋垫的被动蛋收集。对GSI数据的分析提供了最精确的估计。据估计，2010年10月30日和11月26日在2010年10月30日和2011年11月27日之间发生产卵。收集GSI数据所需的努力，由于需要致命收获而产生一些影响。使用简单的贝叶斯地区曲线模型分析了SPAWNER计数，提供了较少的生成时序估计，但该方法可能对人口的影响可忽略不计，并且只需要中等努力。蛋垫的部署需要高努力并收集信息不足，以导出产生的产生时间的统计估算。我们讨论如何将不同方法从不同方法组合成一个集成模型，以最大限度地提高精度，同时最大限度地减少努力和影响。

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