The use of acoustic acceleration transmitter tags for monitoring of Atlantic salmon swimming activity in recirculating aquaculture systems (RAS)

•Acoustic telemetry techniques can be efficiently used for fish monitoring in RAS.•The swimming activity was positively correlated with increased water speed and acute stress.•Changes in the dissolved oxygen conc. caused decrease in swimming activity.•Feeding periods increased Atlantic salmon swimming activity.•RAS operational problems caused maximum recorded swimming activity.