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首页> 外文期刊>ICES Journal of Marine Science >A stage-based estimator of daily egg production
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A stage-based estimator of daily egg production

机译：基于阶段的每日产蛋量估算器

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Snapper (Chrysophrys auratus) in South Australia spawn over a wide range of daily times and hatch in similar to 1.5 d. Traditional estimates of daily egg production (i) divide sampled eggs into daily age cohorts, e.g. days 1 and 2, (ii) compute cohort ages by assuming that all spawning occurs at a fixed daily peak hour, and (iii) link the estimation of spawning egg density with egg mortality rate by regressing cohort egg densities against cohort age. We propose a method for estimating daily egg production, the number of eggs spawned per unit area per day (P-0), without these assumptions. We use a range of estimates of snapper egg mortality rate obtained from prior studies to backcorrect for egg mortality to the age 0 spawning egg density for each stage of eggs individually rather than aggregating into daily cohorts. P-0 is estimated as a mean of sample tow densities rather than as a regression intercept. This stage-based P0 estimator avoids errors associated with assuming a fixed daily spawning hour and classifying eggs into day 1 or 2. It requires no regressions of sampled daily cohort egg densities against age, which often provide imprecise estimates of mortality rates. Simulation testing showed 1-2% accuracy for this estimator of P-0. The uncertainty of assuming egg mortality rates is moderated by the insensitivity of estimates of P-0 to the input value of egg mortality rate.
机译：南澳大利亚的鲷鱼（Chrysophrys auratus）每天都有很长一段时间产卵，孵化大约1.5 d。传统的每日产蛋量估算（i）将抽样的鸡蛋分为不同年龄段的人群，例如第1天和第2天，（ii）假设所有产卵都发生在固定的每日高峰时间，以计算出同龄人的年龄；（iii）通过将同龄人的卵密度与同龄人的年龄进行回归，将产卵密度的估计值与死亡率相联系。我们提出了一种在没有这些假设的情况下估算每日产蛋量，每天每单位面积产卵数（P-0）的方法。我们使用从以前的研究中获得的鲷鱼卵死亡率的一系列估计值，将卵死亡率逐个校正至0岁，并逐个计算各个阶段卵的产卵密度，而不是汇总到每日队列中。 P-0估计为样品丝束密度的平均值，而不是回归截距。这种基于阶段的P0估计器避免了假设每天固定的产卵时间并将卵分类为第1天或第2天相关的错误。它不需要对年龄的每日同类队列卵密度进行回归分析，因为这往往无法准确估算死亡率。仿真测试表明，该P-0估算器的精度为1-2％。 P-0估计值对鸡蛋死亡率输入值的不敏感程度减轻了假设鸡蛋死亡率的不确定性。

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