Schematic of the video plankton recorder (VPR) showing layout of major underwater components. Four CCD cameras, each having a different magnification, and the strobe are held on side-arm mounts 1 m apart. A modified LHPR box is positioned just aft of the imaged volume to collect particles for direct comparison with video images. Video is transmitted to the surface via a fiber optic telemetry system. A serial data link provides two-way communication with the LHPR stepper motor and ancillary sensors.