This data repository includes all the fish swimming data and metadata used to investigate how fish can recapture their own wake to improve swimming efficiency. Custom Matlab scripts developed to compute kinematics, pressure fields, and forces are available here. Matlab scripts: The custom Matlab scripts developed to compute and analyze kinematics, velocimetry, pressure, and force data are in separate folders, including the master script and secondary functions. Pressure calculations from PIV data use the queen2 Matlab package available at ( http://dabirilab.com/software). Respirometry data (supplementary data): We provide the oxygen consumption data used in statistical analysis of the COT of each specimen in separate sheets in a single xlsx file. In addition to raw oxygen consumption data, each sheet includes metadata relative to experimental conditions and the magnitude of the relative flow speeds in body length per second tested during steady swimming trials. We also provide the rpm to flow velocity calibration used with our flume. Scaled original pictures of the fish used for respirometry experiments are available in .jpg format and include morphological information such as standard body length (BL) and fork length. PIV data: High-resolution videos and velocity fields computed using DaVis are sorted by fish specimen and swimming speed. Additional metadata relative to the fish and experimental parameters (i.e., salinity, temperature) are included. Scaled original pictures of the fish used to conduct top-down PIV experiments are available in .jpg format and include morphological information such as standard body length (BL) and fork length.