Trammel nets are one of the most complex, yet efficent gill nets that are in popular use worldwide. Unlike single wall gill nets which will catch a narrow range of fish sizes, a trammel net will catch a wide variety of fish sizes. Essentially, a trammel net is three layers of netting tied together on a common float- and leadline. The two outer layers of netting (known as walls or brails) are constructed out of large mesh netting (12" to 18" square) with a twine size of #9 multifilament nylon or .81mm to .90mm monofilament. These efficient nets can be fished floating, sinking, stationary or drifting.