The sticking fish is one of the most amazing creatures inhabiting the oceans. They spend almost all their life attaching to various “masters” with the help of the first dorsal fin, displaced to the upper part of the head and transformed during the evolutionary process into a special sucker, which has the shape of an oval disc. These fish were repeatedly found on cetaceans, rays, dolphins, turtles and even on sea vessels. Sticking fish, even the most bloodthirsty predators of the seas and oceans - sharks - manage to turn into a convenient and comfortable "vehicle".
According to the biological classification, these unusual sea creatures belong to the family of bony detachments of the perciformes of the ray-finned class. They are widely distributed in the waters of the subtropical and tropical seas. The sticking fish is not just an amazing creature, it is a vivid example of the evolutionary adaptability of biological organisms to various conditions of existence. The fact is that nature did not provide it with a swim bladder, which allows it to regulate the depth of the dive. And the sticking fish found a completely original solution, using larger sea creatures as “vehicles”.
Different types of these unusual inhabitants of the underwater world prefer well-defined "owners", not only significantly facilitate their long journeys, but in many cases play a very important role in their lives. The most independent in its choice is the so-called ordinary stuck. Unlike his other “sticking” relatives, he has a certain inclination towards independent living and often travels in proud solitude. By the way, it is one of two types of representatives of this family (the second is the shark remoor) inhabiting Russian territorial waters.
Juvenile fish-sticks initially exist offline and begin to actively stick to floating objects only after reaching a size of more than four centimeters. At this stage of development, the sticking fish chooses small fish, for example, kuzovok and puffer fish, to its satellites. For a long time it was believed that these representatives of the marine fauna feed exclusively on the remnants of the food of their large "owners". But it is not so. Their diet is dominated by planktonic and small animal organisms living in the water column, as well as exoparasites of the “host”.
Unlike the ordinary one, the shark remoor is connected with its bloodthirsty "vehicle" by much stronger ties. She is a true sea shadow, everywhere inseparably following her toothy "mistress". Such sticking fish and sharks are a good example of a biological tandem and the perfection of the planet's ecosystem. The menu of the remorus is based on small invertebrate parasites - copepods that live on the shark's body, which undoubtedly brings considerable benefits to the predator.
Apparently, remora cannot exist completely independently. Until now, this species was found sticking only attached to the shark, and mostly in its gill cavity, where there is free access of water to the breathing apparatus of the remorus without any effort on its part. It is also interesting that the sticks of this type taken from the shark and placed in the aquarium felt extremely uncomfortable, one can even say badly. Removers showed signs of "heavy breathing", making more than two hundred breathing movements per minute.
Also characteristic and rather unusual feature of many species sticking is their ability to change their color. In general, the size of adult fish-sticking individuals ranges from 30 cm to one meter. The boundaries of the depths of their habitat about 20 - 50 m.