How fish breathe

Fish, like all other representatives of the earth's flora and fauna, need to receive a certain amount of oxygen to ensure trouble-free life. The internal organs of sea creatures are active even while the fish is sleeping.

Oxygen enters the body of the fish through a special organ - the gills, which are located on the left and right sides just behind the oral cavity. The gills are composed of several bony arches supported by gill lobes. The petals are made up of thousands of blood capillaries, in which the blood extracts oxygen from the surrounding aquatic environment. The same gills remove carbon dioxide from the fish's body, supporting the metabolism of nutrients and elements necessary for the life of waterfowl creatures.

Initially, oxygen enters the arterial blood of the fish, after which it disperses throughout the body, enriching the internal organs. In general, the gills of most fish species work like a pump, pumping impressive amounts of water over a certain period of time. First, the organ opens, drawing water inward, and after all the oxygen has been "extracted" from it, the gills narrow, releasing carbon dioxide outward. At the same time, the fish constantly opens its mouth, which creates the feeling that this process is similar to how people breathe. This breathing method is performed almost automatically, so that even when the fish is asleep, its organ is working properly, keeping the body in good working order.

As for the more active representatives of the aquatic fauna, they require more oxygen than those fish that lead a more passive lifestyle. For example, sharks, tuna and mackerel swim constantly with their mouths open, which allows their gills to absorb more water and "extract" more oxygen. Less mobile fish, such as flounder, carp and halibut, open their mouths at regular intervals, since they do not need such an impressive amount of oxygen. Accordingly, the gills of large inhabitants of the deep sea also have a different shape - the gill elements are thicker and larger, and the membranes on them also have a unique appearance.

A separate feature of the oxygen absorption process in active fish is the fact that they have to be mobile even during sleep. If they do not swim constantly, then the body will not be provided with a sufficient amount of oxygen, which will lead to suffocation and death of the internal organs of active fish.