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In situ swimming speed and swimming behaviour of dielly migrating planktivorous fish were studied at a120-m-deep location. Acoustic target tracking was performed using a hull-mounted transducer and submersible transducerslocated on the sea bottom and free hanging in the water column. The original data displayed a relationship betweendistance to transducer and swimming speed. A simplistic smoother applied during post-processing, appeared tobreak this relationship. Target tracking thus provided robust results on in situ swimming behaviour throughout the watercolumn. Swimming speeds of deep-living fish, mainly Norway pout (Trisopterus esmarkii) and whiting (Merlangiusmerlangus), were highest during the day (speeds centred around 14–16 cm·s–1) and decreased somewhat by night(modes around 10–11 cm·s–1). Fish in the upper 10–30 m swam somewhat faster (speeds ranging from 16 to 24 cm·s–1).Fish in the upper layer at night were mainly Atlantic herring (Clupea harengus), sprat (Sprattus sprattus), and whiting.We ascribe the reduction of swimming speed in deep-living fish at night to a switch from visual feeding during daytimeto nonvisual feeding by night. We suggest that shallow-living fish could forage visually even by night. Most trackswere fairly short, but some long tracks unveiled elaborate swimming paths as well as cyclic swimming behaviour

In situ swimming speed and swimming behaviour of fish feeding on the krill Meganyctiphanes norvegica