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首页> 外文期刊>ICES Journal of Marine Science >Effects of age and size on spawning and egg production in gag and scamp grouper off the southeastern United States
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Effects of age and size on spawning and egg production in gag and scamp grouper off the southeastern United States

机译：年龄和大小对美国东南部塞格石斑鱼和石斑鱼产卵和产卵的影响

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摘要

Stock assessments historically have used age- and size-independent methods to estimate reproductive output in marine fishes. Recent assessments have used total egg production (TEP), often assuming an invariant spawning frequency (SF) for all females. However, spawning parameters vary with age and size, which invalidates this assumption. This study investigated the age- and size-dependence of female spawning fraction, duration, and frequency in two economically valuable species, gag (Mycteroperca microlepis) and scamp (Mycteroperca phenax), in Atlantic waters off the southeastern United States, with the ultimate objective of quantifying the effect of these dependencies on TEP estimates. Spawning parameters had moderate-to-strong dome-shaped relationships with age and size (r(2) = 0.63-0.94), peaking at intermediate ages and sizes. As larger, older females approach sexual transition, they may increase their lifetime reproductive success by shifting energy resources away from female reproductive investment (i.e. eggs) towards investment that will promote future male reproductive success (i.e. gonad transformation). The estimate of TEP based on age-dependent SF was 38% lower for gag and 41% lower for scamp than the estimate based on age-independent (AI) SF; therefore, the AI method overestimates stock productivity. Incorporating age- and size-based reproductive data into assessments can lead to more reliable stock productivity estimates and potentially improved management.
机译：历史上的种群评估使用与年龄和大小无关的方法来估计海水鱼类的繁殖产量。最近的评估使用了总卵产量（TEP），通常假设所有雌性的产卵频率（SF）不变。但是，产卵参数随年龄和大小而变化，这使该假设无效。这项研究调查了美国东南部大西洋水域中两个具有经济价值的物种gag（Mycteroperca microlepis）和scamp（Mycteroperca phenax）的雌性产卵分数，持续时间和频率的年龄和大小依赖性，其最终目标是量化这些依赖性对TEP估计的影响。产卵参数与年龄和大小呈中等到强的圆顶状关系（r（2）= 0.63-0.94），在中等年龄和大小时达到峰值。随着年龄较大的雌性接近性转型，他们可以通过将能源资源从雌性生殖投资（即卵子）转移到可促进未来男性生殖成功（即性腺转化）的投资中来增加一生的生殖成功。基于年龄的SF的TEP估计值比基于年龄的SF的估计值低38％，针对Scamp的TEP降低41％；因此，AI方法高估了库存生产率。将基于年龄和规模的生殖数据纳入评估可以带来更可靠的种群生产力估计并可能改善管理。

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