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Figure 4 . Overview of main trawl monitoring sensors. Two PX Trawl Eyes measured the height of the trawl opening, depth, distance to seabed (bottom contact) and monitored fish entering the trawl. One sensor was placed in the upper panel above the ground gear and the other in the tunnel about 1 m in front of the DV (deep vision camera system). Two flow sensors were used to measure waterflow in the trawl opening and in the tunnel. The sensors also measured height, roll, pitch and depth. A PX MiniCatch sensor was mounted in the cod end. Door performance was monitored with PX MultiSensors. The sensors monitored door spread, height, roll and pitch.
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