North Temperate Lakes LTER: Fish Lengths and Weights 1981 - current

Data are collected annually to enable us to track the fish assemblages of eleven primary lakes (Allequash, Big Muskellunge, Crystal, Sparkling, Trout, bog lakes 27-02 [Crystal Bog] and 12-15 [Trout Bog], Mendota, Monona, Wingra and Fish). Sampling on Lakes Monona, Wingra, and Fish started in 1995; sampling on other lakes started in 1981. Sampling is done at six littoral zone sites per lake with seine, minnow or crayfish traps, and fyke nets; a boat-mounted electrofishing system samples four littoral transects. Vertically hung gill nets are used to obtain two pelagic samples per lake from the deepest point. A trammel net samples across the thermocline at two sites per lake. In the bog lakes only fyke nets and minnow traps are deployed. Parameters measured include species-level identification and lengths for all fish caught, and weight and scale samples from a subset. Dominant species vary from lake to lake. Perch, rockbass, and bluegill are common, with walleye, large and smallmouth bass, northern pike and muskellunge as major piscivores. Cisco have been present in the pelagic waters of four lakes, and an exotic species, rainbow smelt, is present in two. The bog lakes contain mudminnows. Sampling Frequency: annually Number of sites: 11

本数据集按年度采集数据，旨在监测11个核心湖泊的鱼类群落组成，具体包括Allequash湖、Big Muskellunge湖、Crystal湖、Sparkling湖、Trout湖、27-02号泥炭湖（Crystal Bog）、12-15号泥炭湖（Trout Bog）、Mendota湖、Monona湖、Wingra湖及Fish湖。针对Monona湖、Wingra湖与Fish湖的采样工作始于1995年，其余湖泊的采样则于1981年启动。每个湖泊设置6个沿岸带采样点，采用围网（seine）、幼鱼诱捕笼（minnow trap）、螯虾诱捕笼（crayfish trap）及囊形诱捕网（fyke net）开展采样；同时使用船载电鱼系统对4条沿岸样带进行采样。使用垂直悬挂的刺网（gill net）在每个湖泊的最深处采集2份远洋带样本。使用三重刺网（trammel net）在每个湖泊的2个采样点跨越温跃层进行采样。仅在泥炭湖中布设囊形诱捕网与幼鱼诱捕笼。测定参数涵盖所有捕获鱼类的物种鉴定结果与体长数据，以及部分个体的体重与鳞片样本。各湖泊的优势物种存在差异：鲈鱼（perch）、岩鲈（rockbass）与蓝鳃太阳鱼（bluegill）为常见物种，大眼梭鲈（walleye）、大口黑鲈、小口黑鲈、北美狗鱼（northern pike）及北美梭鲈（muskellunge）为主要食鱼性鱼类。白鲑（Cisco）曾在4个湖泊的远洋水域被记录，而外来物种彩虹胡瓜鱼（rainbow smelt）则分布于2个湖泊中。泥炭湖中栖息有泥鳉（mudminnows）。采样频率：年度采样；采样点总数：11个。