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The reaction of individual gadoids to a bottom-trawling vessel has been observed in situ in the BarentsSea using a free-floating buoy and acoustic target-tracking methods. More than 20 000 tracks were analysed in termsof velocity changes in vertical, athwarthship, and alongship direction relative to the vessel, the warps, and the trawl,respectively. The fish starts diving about 15 min before vessel passing. This coincides with the time the trawl is runningand not with the gradual increase in vessel noise caused by the approaching vessel. The change in horizontal movement ismore gradual and is directed away from the vessel in the alongship direction, but towards the vessel in the athwarthshipdirection. The strongest and sharpest response is related to the trawl warps. A strong herding in front of the warps is seen.Closer to the bottom, an athwarthship herding reaction is seen away from the trawl doors or possibly the lower parts ofthe warps. There were only minor differences when grouping the tracks according to light level, fish size, and fish density

When fish meet a trawling vessel: examining the behaviour of gadoids using a free-floating buoy and acoustic split-beam tracking