The major function is assigned to fish fins: they help fish to move with water and to change a trajectory, sometimes, surprisingly quickly. But the number of fins not at all water inhabitants is identical, there are fishes with 4 couples, and there are also those who have even 8 pairs of fins.
Types of fins
The number of fins in many respects depends on a kind of fish. Traditionally fins are divided into two main groups: pair and unpaired. Treat steam rooms belly and chest. Are ranked as unpaired tail, back and anal. By means of tail the fish begins the movement, this fin the strong movement pushes her forward. Back and anal are intended mainly for deduction of a fish body in water.
The few species of fish have still a fat fin which is placed between back and tail fins.
Different types of fishes have a different number of back fins. For example, karpoobrazny and seldeobrazny are allocated with one back fin, and okuneobrazny have two fins, and here treskoobrazny - three back fins.
Functions of fins
The arrangement of fins also can various, for example, at a pike a fin be displaced in the end of a body, at karpoobrazny and seldeobrazny it is placed on a seredka, at a cod - about the head. And the tuna and a mackerel possess even the additional small fins located behind back and anal fins. There is such species of fishes (skorpenovy) which in a back fin have poisonous glands. There are also just organized fishes at whom fins are absent completely (Cyclostoma). The more fins at fish, the she is guided in water space better, and to her it is simpler to that to carry out movement on more thickly waters. Chest fins are applied by fishes to sluggish swimming. Besides, chest fins on a row with tail and belly, help to hold to fish balance of the trunk. The majority of fishes who swim at the bottom move on the sea earth thanks to chest fins. The small group of inhabitants of the water environment (for example, murenovy) has no belly and chest fins at all. Some types can have even no tail (for example, sea horses, fish moon, slopes, etc.). The fin is a vital part of a fish organism. Except movement in water, on the ground, and also commission of various jumps and jumps, fins help fishes to be fixed to something, to get food and even allocate them with some specific protective properties. For example, bull-calves have special fins suckers, trigla, thanks to fins, with ease get to themselves food, and fins at kolyushka are equipped with the preserving functions.