This video of striped bass moving upstream and into fresh water was taken at head-of-tide on the NW Miramichi on June 1, 2019. This was the same day the peak of the Atlantic salmon downstream smolt run was documented at the rotary screw traps. This bass migration occurred for several hours. They could be caught on virtually every cast with a streamer fly, so were definitely feeding. DFO claims striped bass have no effect on the NW Miramichi salmon population. Draw your own conclusion.
Striped bass on the Northwest (YouTube)