Example images collected from contemporaneously deployed ROV (top row), 120-kHz split beam echosounder (middle row), and DIDSON (bottom row) over boulder/lava field (a), transitional (b), and sand (c) designated habitats off southwest Iceland, 15–16 April 2009.

Note redfish Sebastes sp. identified in ROV video data collected from boulder/lava field habitat, Atlantic cod Gadus morhua identified in both ROV and DIDSON data, and haddock Melanogrammus aeglefinus identified in the ROV data with faint targets detected near the substrate in the DIDSON and 120-kHz split beam echosounder data.