Does a Shark harm Remora?

No, a shark does not harm remora. Remora, also known as suckerfish, have a mutualistic relationship with sharks, where both species benefit from the interaction. Remora attach themselves to sharks using a suction cup on their head and travel with the shark, feeding on scraps of food left by the shark. The shark gains a cleaning service as the remora removes parasites from its skin and gills, while the remora obtains food and protection from predators by associating with a larger animal.