When your trolling its actually important to catch fish if they are there.So keep informed on how to troll with all the different techniques there are to catch.Know how to correctly fish with boards and cranks,dipseys and spoons/harnesses divers and weights.Know how your electronics work and use it properly.Have enough tackle and colors to keep changing things till you start catching.Cover the water column with your spear of rods till you find the active fish.You are hunting for them and that is part of the challenge.Luckily there are a record number of walleye in Erie now,so your chances are good catching walleye.Not so much with perch though.