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Game fish response to dredging of a eutrophic urban lake in Minnesota

机译：在明尼苏达州富营养化城市湖的疏浚游戏的反应

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Mundahl ND, Hoisington J. 2020. Game fish response to dredging of a eutrophic urban lake in Minnesota. Lake Reserv Manage. XX:XXX-XXX.We compared relative abundances, average weights, and growth rates of 6 game fish species before and after the 1999-2001 partial dredging of Lake Winona, a eutrophic, urban lake in Minnesota, to determine whether lake dredging sustainably changed fish population structure to the benefit of anglers. Relative catch rates (trap nets, gill nets, electrofishing) and growth rates were obtained from various fish population assessments and lake surveys conducted by the Minnesota Department of Natural Resources (MN DNR) from 1980 to 2016 for both Lake Winona and Lake Oscar, an ecologically similar lake that has not been dredged. Before-after control-impact (BACI) analyses revealed that compared to Lake Oscar, relative catch rates in Lake Winona after dredging declined significantly for bluegill (Lepomis macrochirus), black crappie (Pomoxis nigromaculatus), and northern pike (Esox lucius), and increased significantly for walleye (Sander vitreus) and largemouth bass (Micropterus salmoides). Average weights of yellow perch (Perca flavescens) and pike increased significantly after dredging. Only black crappie displayed improved growth after dredging. Largemouth bass catch rates for quality- and preferred-size fish increased in postdredging surveys. Although predredging data are lacking, population size structures and relative weights of bluegill, crappie, and bass post dredging were within ranges that meet MN DNR management objectives. Overall, dredging of Lake Winona was followed by improved quality and structure of game fish populations in this system, something that decades of previous biomanipulation and macrophyte management had not accomplished.
机译：Mundahl Nd，Hoiseton J.2020.在明尼苏达州的富营养学城市湖疏浚的游戏响应。湖预留管理。 XX：XXX-XXX.WE比较1999 - 2001年湖泊湖湖泊湖，明尼苏达湖湖泊湖，富营养化的城市湖泊之前和之后的6个游戏物种的相对丰富，平均权重和增长率，以确定湖疏浚是否可持续改变鱼群结构与钓鱼者的利益。从1980年到2016年为Winona湖和奥斯卡湖（MN DNR）从1980年到2016年，从Minnesota自然资源部（MN DNR）进行的各种鱼群评估和湖调查获得了相对捕获率（陷阱网，鳃网，电拍）和增长率没有疏浚的生态上类似的湖泊。在后期后，在后期后 - 突破（BACI）分析显示，与奥斯卡湖相比，疏浚后湖泊湖中的相对捕获率显着下降，为Bluegill（Lepomis Macrochirus），黑克拉皮（Pomoxis nigromaculatus）和北部派克（Esox Lucius）以及Walleye（Sander Vitreus）和Largemouth Bass（MicroOpterus Salmoides）显着增加。在疏浚后，黄鲈鱼（Perca Flavescens）和派克的平均重量显着增加。只有黑色克拉皮在疏浚后显示出改善的增长。 Largemouth Bass捕获质量和首选尺寸的鱼类的速率增加了积分调查。虽然缺乏预备数据，但蓝鳃，克拉皮和低音划破的人口大小结构和相对重量的疏浚在符合Mn DNR管理目标的范围内。总体而言，威纳湖的疏浚之后是在该系统中提高了游戏群的污染群体的质量和结构，几十年的生物化和宏观物质管理层没有完成。

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