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. Beach seining was discontinued after the 2019 season. The only sampling done in 2020 were a single gill-netting replicate in Sparkling, Crystal, and Trout lakes. Sampling in Fish Lake was missed in 2021 due to significant lake level changes. Data from the two bogs is missing in 2022. Sampling Frequency: annually Number of sites: 11.

本数据集按年度采集数据，用于追踪11个主要湖泊的鱼类群落组成，涵盖阿勒夸什湖（Allequash）、大北美狗鱼湖（Big Muskellunge）、水晶湖（Crystal）、斯帕克林湖（Sparkling）、特劳特湖（Trout）、两处沼泽湖（27-02号[水晶沼泽（Crystal Bog）]与12-15号[特劳特沼泽（Trout Bog）]）、门多塔湖（Mendota）、莫诺纳湖（Monona）、温格拉湖（Wingra）以及菲什湖（Fish）。莫诺纳湖、温格拉湖与菲什湖的采样工作始于1995年，其余湖泊的采样则始于1981年。每个湖泊设置6个沿岸带（littoral zone）采样点，采用围网、小鱼诱捕笼、小龙虾诱捕笼以及折叠式渔笼进行采样；同时使用船载电渔系统对4条沿岸样带开展采样。垂挂刺网用于在每个湖泊的最深处采集2份远洋带（pelagic zone）样本。采用三层刺网在每个湖泊的2个位点跨越温跃层（thermocline）进行采样。沼泽湖仅布设折叠式渔笼与小鱼诱捕笼。测量参数包括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。不同湖泊的优势物种存在差异。鲈鱼、岩鲈与蓝鳃太阳鱼为常见物种，大眼梭鲈、大口黑鲈、小口黑鲈、白斑狗鱼与北美狗鱼为主要的食鱼性鱼类。西鲱（Cisco）已在4个湖泊的远洋水域出现；另有外来物种彩虹胡瓜鱼（rainbow smelt）分布于2个湖泊中。沼泽湖含有泥鲦（mudminnow）。2019年季末之后，海滩围网采样被终止。2020年仅对斯帕克林湖、水晶湖与特劳特湖开展了1次刺网重复采样。2021年因湖泊水位发生显著变化，菲什湖的采样工作未能进行。2022年两处沼泽湖的采样数据缺失。采样频率：年度采样；采样位点总数：11个。