Similarly, you may ask, what is the symbiotic relationship between a shark and remora?
are Remoras harmful?
Remoras are large, gray, parasitic fish usually found stuck to the sides of sharks, manta rays, and other large species. Remoras are not dangerous to their hosts. They simply attach to the larger animal and hitch a ride. As long as the diver is covered by a wetsuit, the remora does no harm.
These fish attach themselves to the larger marine creatures including sharks, turtles, manta rays and the like for an easy mode of transportation, to gain the protection provided by being one with the bigger animal, and for food. Yet their hitching on to a shark causes no harm to the shark itself.