 Some of these innovations include the invention of monofilament nylon fishing lines, the fiberglass (later graphite composite) fishing rod, the electric trolling motor, the fish finder/depth locator, and new artificial lures and baits made of various plastics.Recently, advanced electronics that mimic the sounds of schooling bait fish have been introduced, and a controversy has arisen over the proper use of these devices in bass tournament fishing.Since the early 1990s, fly fishing for bass, particularly smallmouth bass, has again become popular, using fly patterns, rods, and fly lines suited for bass.