Trolling for fish is a popular method used by anglers everywhere. Typically, anglers troll for freshwater saltwater species like walleye, musky, salmon, trout,tuna , marlin and most large saltwater species. The idea is you can fish much of the lake quickly and at various depths to find the strike zone. Trolling more often than not yields some of the bigger fish in those species as well, which makes the whole process even more exciting. To catch those fish, you need the right gear.