Elkrun
what you are seeing is actually just one rope bundled in to three separate bundles. I use a clip for clipping to the pot and my bouy has a clip that clips to the loop at the end of the rope.

For my crab rope, yes, all my ropes have a clip at one end and a loop at the other. that way I can daisy chain them together. I rarely crab in more than 50' so I usually run just one rope.