Historically, yellow perch, Perca flavescens Mitchill held great recreational and commercial importance to the Lake Michigan fishery. Unfortunately, fluctuations in lake‐wide abundances in the past four decades created inconsistencies in catch. As adults, yellow perch have been commonly observed to swim great distances suggesting there is likely to be partitioning of the population within the lake. The objective was to determine whether population demographics of yellow perch in the Indiana waters of Lake Michigan were consistent with a single population. Seasonal population demographics of yellow perch collected from the Indiana waters of Lake Michigan in 2009, 2011 and 2012 were compared. Catch‐per‐unit‐effort of female yellow perch increased during later sampling periods across years. Similarly, total length of females and males increased 10% throughout the year. The proportion of females increased from 20% at the beginning of the survey period to 95% at the end. A few larval yellow perch were collected. These data suggest that Indiana waters of Lake Michigan are not a primary spawning area, rather these waters serve as a feeding or recovery area for post‐spawned yellow perch, particularly females.

中文翻译：

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密歇根湖南部黄鲈的时空分离

从历史上看，黄鲈（Perca flavescens Mitchill）对密歇根湖渔业具有重要的娱乐和商业重要性。不幸的是，过去 40 年全湖丰度的波动造成了渔获量的不一致。作为成年人，通常观察到黄鲈会游很远的距离，这表明湖内的种群可能存在划分。目的是确定密歇根湖印第安纳水域中黄鲈的种群统计数据是否与单一种群一致。比较了 2009、2011 和 2012 年从密歇根湖印第安纳水域收集的黄鲈的季节性人口统计数据。在跨年的后期采样期间，雌性黄鲈的单位捕捞量增加。相似地，全年雌性和雄性的总长度增加了10%。女性比例从调查开始时的 20% 上升到结束时的 95%。收集了一些幼虫黄鲈。这些数据表明，密歇根湖的印第安纳水域不是主要产卵区，而是作为产卵后黄鲈（尤其是雌性）的觅食或恢复区。