Data from: Effects of environmental factors on sucker catch rate, size structure, species composition, and precision from boat electrofishing oksd_zentner_data_S1_2023.xlsx C/f: Catch per effort (hours of boat electofishing) for spotted sucker Minytrema melanops, black redhorse Moxostoma duquesnei, golden redhorse Moxostoma erythrurum, and northern hogsucker Hypentelium nigricans combined on Lake Eucha. Time of Day: if electrofishing sample was collected during the day or night Gauge Height: average reservoir gauge height measurement during electrofishing sample. Averages taken from 15 min estimates of gauge height. Reservoir Storage: average reservoir storage measurement during electrofishing sample. Averages taken from 15 min estimates of reservoir storage. Conductivity: ambient conductivity during electrofishing sample. Water Temperature: surface water temperature during electrofishing sample. Site: Denotes the electrofishing transect location on Lake Eucha where the electrofishing sample was taken. Distance Electrofished: the length of shoreline electrofished (Kilometers) for each electrofishing sample. Electrofishing Boat: denotes the maker of the electrofishing unit used to collect the sample. oksd_zentner_data_S2_2023 Species: the species of Catostomide captured. Specifically: spotted sucker Minytrema melanops, black redhorse Moxostoma duquesnei, golden redhorse Moxostoma erythrurum, and northern hogsucker Hypentelium nigricans Total Length: the total length measurement for each fish in mm. Blank cells indicate a fish that did not get measured. Water Temperature: surface water temperature during fish sample. Time of Day: if fish sample was collected during the day or night