Lake Wingra: Fish Abundance 1995 - current

Data are collected annually to enable us to track the fish assemblages of Lake Wingra. Sampling is done at six littoral zone sites per lake with a beach seine, minnow or crayfish traps, and fyke nets, while 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 nearshore sites per lake. Fish are identified to species. Lengths are measured for all fish caught, while weight and scale are collected from a subset. Derived data include catch per unit effort and size distribution by species, lake, and year. Protocol used to generate data: Number caught for each species is summed over repetitions of a gear within a lake and over depth. Sampling Frequency: annually. Number of sites: 1. Note that 2020 data does not exist due to insufficient sampling.

本数据集按年度采集，旨在追踪温格拉湖（Lake Wingra）的鱼类群落组成。针对每个湖泊，共设置6个沿岸带站点，采用岸曳网（beach seine）、幼鱼诱捕笼与小龙虾诱捕笼、定置陷网（fyke nets）开展采样；同时使用船载电渔系统（boat-mounted electrofishing system）对4条沿岸样带进行采样。采用垂直悬挂刺网（vertically hung gill nets）在每个湖泊的最深点位采集2份远洋层样本；使用三层刺网（trammel net）在每个湖泊的2个近岸站点跨越温跃层进行采样。所有捕获的鱼类均被鉴定至物种水平：对所有个体测量体长，并从部分采样个体中采集体重与鳞片样本。衍生数据集包括单位捕捞努力量渔获量（catch per unit effort），以及按物种、湖泊与年份划分的体长分布数据。数据生成流程为：将同一湖泊内同一种渔具的重复采样、不同深度的渔获量按物种分别求和。采样频率：每年1次。站点数量：1个。注：因采样量不足，2020年无有效数据。