This is a picture of a coil of ground wire that is covered with discs made from recycled tires.
The nets of a dragger travel across the ocean floor and can get caught up on big rocks but with the rubber discs surrounding the wire it will allow the dragger to go over slightly more uneven fishing bottom where fish may be hiding as opposed to the easy flat bottom in which a net would glide right over.
When they use much larger discs they are called rock-hoppers. They will roll over much larger rocks instead of stopping the boat dead in it’s tracks or getting hung down on the big rocks.
Recycled Tires Cut into Discs For Groundlines, originally uploaded by captjoe06.
Good Morning Gloucester 