The term 'sharksucker' is a common name for the remora, a species of fish that has a special organ on its head that allows it to attach itself to larger marine animals such as sharks, whales, and turtles. The remora uses this organ to feed off the scraps of food left behind by the larger animal, and also to hitch a ride on them. Remoras are found in tropical and subtropical waters around the world, and can grow up to two feet in length.