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The trammel net is a variation on the gillnet that consists of three layers of net. A slack, small mesh, inner panel of netting is sandwiched between two outer layers of netting, which are taut and have a larger mesh size. The inner panel may be made of twisted monofilament or twisted nylon filament. Trammel nets are held vertically in the water by weights on the bottom (lead line), and floats on the top (float line). According to their design, ballasting and buoyancy, these nets may be used to fish near the surface, in mid-water or at the bottom, either in estuarine or marine waters.