In this dataset, there are three tabular data (.csv) files that provide: a) data on physical measurements (length, weight) of test individual fish (rows) and their immediate and delayed (12, 24, 36, 48, and 96 h) post-test mortalities (Fish Metrics and Mortality.csv); b) data on conditions for each test trial (rows) of the pneumatic lift at three test lift heights, the resultant number of fish lifted in each lift cycle (up to 10 cycles), the number of fish not recovered at the end of all cycles (Trial Data.csv); and c) data collected from an self-contained acceleration/pressure sensor passed through the pneumatic lift device at three test lift heights (Pressure Acceleration Data.csv).