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.

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