The Common Remora does not seem to have a negative overall effect on its host. The host provides the remora with fast-moving water to bathe its gills, a steady flow of food, transportation, and protection. The remora benefits the host by feeding in part on some of its parasites, but increases its hydrodynamical drag. Common Remora is commonly found in warm marine waters from all over the world.

The Live Sharksucker or Slender Sharksucker, Echeneis naucrates, is a species of marine fish in the family Echeneidae Echeneidae. A live sharksucker is known to attach itself temporarily by its modified dorsal fin used as a sucking disc to various hosts, such as shark, rays, large bony fishes, sea turtles, whales, dolphins, ships, and even sometimes scubadivers.