The term 'clinging fish' is a reference to the Remora, a type of fish that has a specialized organ on its head which allows it to attach itself to larger fish and other marine animals. This behavior is known as 'remoras' and is used by the fish to feed off of the scraps of food left behind by the larger fish. The Remora is also known for its ability to clean the skin of larger fish, removing parasites and other debris.