well, fast fish like tuna, mako sharks, sailfish, and mackerel can go 25 to 30 MPH, (some sources say 60, but that just doesn't add up) so I have no problem believing a walleye or a pike can hit 5 to 10. I know some guys troll at over 5 mph for musky, and 2.5 to 3.5 is common for walleye trolling.