Data from: Relationships between landscape constraints and a crayfish assemblage with consideration of competitor presence Crayfish were sampled from streams in the Ozark Highlands of Oklahoma from 2014 to 2015 using tow-barge electrofishing. Tow-barge electrofishing settings were pulsed direct current (DC), 60 Hz, and a 25% duty cycle. Voltage was adjusted to achieve a target power (W) that maintained a consistent electric field regardless of ambient water conductivity. ID: The unique identifier given to each collection. Stream: The stream name according to the National Hydrography Dataset CL: The carapace length of each individual (1.0 mm) SEX: The sex of each individual (M=male, F=female) Common Name: The common name of the species Scientific Name: The scientific name of the species Date: The date the samples were collected (month/day/year) Lat: The latitude where each sample was collected Long: The longitude where each sample was collected