Understanding the movements of pelagic fish and the influence that environmental conditions have on their vertical and geographic distribution is fundamental to understanding their ecology and necessary for effective management. Bio-logging technology is a fisheries independent tool that is important for tracking animal movement patterns. Pop-up satellite archival tags (PSATs) were deployed on blue marlin using the traditional harpoon and longline fisheries of southeastern Taiwan. Depth, temperature and ambient light data were recorded by the PSATs. In total, 14 blue marlin were tagged and PSATs remain affixed from 27 to 360 days-atliberty. Linear displacements ranged from 56 to 3,759 km from deployment to popup locations. Diving depths ranged from the surface to ~441 m and water temperatures occupied ranged from 32.3°C to 6.8°C, and the distributions of time spent at depth were significantly different between daytime and nighttime. Tagged blue marlin spent the majority of daytime in the surface mixed-layer to ~50 m, and at nighttime they were exclusively confined to the surface. The changepoint analysis (CPA) distinguished multiple breaks in the time series that corresponded to seasonal variability and other breakpoints were suggestive of habitat differences. We have shown that by incorporating vertical movement metrics into the analysis of the PSAT time series data by CPA, previously hidden shifts in behavior can be revealed. The resulting increase in ability to discern complex behavioral patterns of blue marlin remotely will likely yield better management and conservation decisions.