Small impoundments (hereafter, “lakes”) provide close‐to‐home fishing opportunities for many anglers but do not always provide quality fishing, especially for panfish. Often, these lakes contain populations of slow‐growing Bluegill Lepomis macrochirus and crappies Pomoxis spp. The presence of abundant Gizzard Shad Dorosoma cepedianum and Common Carp Cyprinus carpio is known to negatively influence these populations. Chemical and mechanical removal of these nuisance species requires intensive effort, is costly, and usually results in only short‐term benefits. An alternative approach is to stock piscivores that prey on these species and reduce their abundances. Hybrid Striped Bass (Striped Bass Morone saxatilis × White Bass Morone chrysops) alone or in combination with Flathead Catfish Pylodictis olivaris were stocked into small lakes to consume Gizzard Shad and Common Carp. To evaluate the success of this approach, I determined whether stockings of hybrid Striped Bass and Flathead Catfish were (1) associated with a consequent reduction in abundances and changes in size structure of Common Carp and Gizzard Shad, (2) related to improved growth rates and size structure of Bluegill and crappie populations, and (3) associated with changes in Largemouth Bass Micropterus salmoides demographics and aquatic macrophyte coverage. Nine treatment lakes were each paired with a reference lake, and fish population variables and macrophyte coverage were analyzed with a before–after, control–impact design. With a few exceptions, additions of piscivores were largely unsuccessful in reducing Gizzard Shad and Common Carp abundances and in improving growth of panfishes and the additions had little effect on Largemouth Bass or macrophyte coverage. A multi‐pronged approach combining several methods (e.g., stocking of piscivores, reducing nutrients, and mechanical or chemical removal) may be necessary to effectively reduce the abundances of Gizzard Shad and Common Carp in these small lakes.

中文翻译：

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加强食肉动物的数量以重建小型蓄水池鱼类社区

小型水库（以下称“湖泊”）为许多垂钓者提供了近海捕鱼的机会，但并不总是提供优质的捕鱼，特别是对于泛鱼。通常，这些湖泊中有缓慢生长的蓝g Lepomis macrochirus和cr脚的Pomoxis spp种群。丰富肫鲥鱼存在Dorosoma cepedianum和鲤鱼鲤众所周知，这些人群产生负面影响。化学和机械去除这些有害物质需要花费大量精力，而且成本高昂，通常只能带来短期收益。另一种方法是放养捕食这些物种并减少其数量的食肉动物。混合条纹低音（条纹低音Morone saxatilis ×单独或与Flat头P鱼（Pylodictis olivaris）组合的白鲈Morone chrysops）放到小湖中食用consume鱼d和鲤鱼。为了评估此方法的成功性，我确定了条纹鲈鱼和Flat鱼杂种的放养是否与（1）随之而来的丰度降低以及普通鲤鱼和G的尺寸结构的改变有关，（2）与生长速度的提高有关。蓝cr和cr鱼种群的大小，大小结构，以及（3）与大嘴鲈Salmoides的变化有关人口统计资料和水生植物的覆盖范围。每个9个处理湖都与一个参考湖配对，并通过前后对比控制设计分析了鱼类种群变量和大型植物的覆盖率。除少数例外，在减少食izz和普通鲤鱼的丰度以及改善pan鱼的生长方面，食盐动物的添加在很大程度上是不成功的，并且这些添加物对大口黑鲈或大型植物的覆盖率影响很小。为了有效减少这些小湖中的G鱼和普通鲤鱼的丰度，可能有必要采用多种方法结合多种方法（例如，放食食草动物，减少营养以及机械或化学去除）。