time without the devices and bait interfering with each other. Spreaders "Spreaders" allow multiple baited hooks or lures to be trolled from a single line. There are many inventive spreader designs, such as devices which cause the baited hooks or lures to move in helical patterns, in a sophisticated emulation of the schooling behaviour of a group of fish. Planer boards "Planer boards" are trolled devices designed to spread fishing lures out away from the fishing vessel. They allow multiple lines to be trolled. They come in dual board and inline board designs. Dual board designs consist of two boards that are spaced apart and attached by a line to a mast near the front of the boat with a separate fishing line in a spring tension release clip that separates when the fishing line is set. Inline boards are attached directly to the fishing line and a spring tension clip that releases upon setting or tripping the planer board so it slides down the fishing line to a swivel tied several feet in front of the lure. Inlines are popular with walleye fishermen. Once tripped they offer much less resistance when reeling in a fish. Baits and lures To be effective, trolling baits and lures must have the visual ability to attract fish and intrigue them with the way they move through the water. Most trolling lures are designed to look and behave like dying, injured, or fast moving fish. They include: Surface lures, also known as topwater lures or stickbaits. They float and resemble prey that is on top of the water. They can make a popping sound from a concave-cut head, a burbling sound from "side fins" or scoops or a buzzing commotion from one or several propellers. Plugs are also known as crankbaits. These lures have a fishlike body shape and as they troll through the water they make various movements caused by instability due to a scoop under their heads. Swimbait, a minnow-like soft plastic bait that is reeled like a plug. Some have swimming tails. Spoon lures resemble the inside of a table spoon. They flash in the light while randomly wobbling or darting due to their shape. Spinnerbait, pieces of wire bent at about a 60 degree angle with a hook on the lower end and a flashy spinner mechanism on the upper end. Trolling baits and lures are either tied with a