A device for attachment to a fishing line and capable of shearing water to create a bubble trail along a length of the fishing line. The device is preferably mounted at the beginning of a leader line and, when pulled through the water at trolling speeds, causes water shear. The device is formed from a housing having at least one aperture constructed and arranged to cause the static pressure in water passing through the aperture while at a trolling speed, wherein water is reduced to below the vapor pressure forming a gaseous state of bubbles effective for concealing a length of the fishing line.
