Using scuba in August and September 1997 and 1998, we surgically implanted acoustic transmitters (Vemco V16 series) in 6 greenspotted rockfish Sebastes chlorostictus and 16 bocaccio S. paucispinis on the flank of Soquel Canyon in Monterey Bay, California. In 1997 we used longline gear to capture and tag greenspotted rockfish, and in 1998 we worked with a commercial fisherman who used modified trolling gear to help us capture and tag bocaccio. Each year, fish were captured at depths of 100–200 m and reeled up to a depth of approximately 20 m. This depth was chosen to reduce temperature and pressure stress caused by bringing fish to the surface. A team of scuba divers descended to the 20-m depth and anesthetized and surgically implanted acoustic transmitters in both species of rockfish. Tagged fish were released on the bottom at the location of catch. Several weeks after tagging, we used the Delta submersible to place an array of recording receivers on the seafloor, which enabled tracking of horizontal and vertical movements of tagged fish for a 3-month period. In September 1998, scientists and pilots were able to relocate three of the tagged fish by using a hydrophone on the submersible, which enabled them to navigate to the middle of schools that contained the tagged fish. Tagged fish were tracked for a 3-month period and provided information about the movements of the two species.