What kind of swimming adaptations are found in aquatic animals?

What kind of swimming adaptations are found in aquatic animals?

Aquatic animals live directly in the water. This is a class of fish, some of the class of amphibians that are found in fresh water, a type of coelenterates, protozoa and unicellular animals that also live in water.

A class of fish – they constantly live in the water. They live in almost all bodies of water on Earth.

The body of a fish consists of a head, torso and tail. On the border of these sections are the gill covers and the anus. The tail ends in fins. Bending the body and tail, the fish moves forward. In addition to the caudal fin, the fish have paired pectoral and pelvic fins, as well as unpaired, one or more dorsal and caudal or anal fins – with the help of them the fish can submerge in water and float to the surface, make turns and maintain balance. The dorsal and caudal fins also help the fish bodies with stability when moving.

Class amphibians – live in water bodies, or near them.

Lake frogs and pond frogs – the body of amphibians is short, wide, without a pronounced tail. In the bare thin skin of amphibians, there are many glands that secrete mucus. Most amphibians have two pairs of legs. In tailless amphibians, the hind legs are longer and stronger than the front ones, which gives these animals the ability to move by jumping. Swimming membranes are developed between the toes of the hind legs of tailless amphibians.

Single-celled and protozoan animals are microscopic in size. Their bodies are made up of one cell. It is based on the cytoplasm with one or more nuclei.

Amoeba moves by the formation of pseudopods. The ciliate shoe and the bursaria move due to the coordinated oscillation of the numerous cilia that cover the entire body. Many unicellular organisms move with the help of flagella – such as euglena green and lablia.

Type coelenterates – lower two-layer multicellular animals with radiation symmetry.

These include freshwater hydras, jellyfish, sea anemones, coral polyps. Hydras and sea anemones lead a sedentary attached lifestyle. The part that they attach to objects is called the sole. Jellyfish swim in the water column and do not have soles.

Hydra and anemones move by bending the body and reinforced to the surface of the object with tentacles, the hydra pulls the sole to the front end of the body, then the walking movements of the hydra are repeated.

Anemones move by slow relaxation and contraction of the sole.

Jellyfish sharply push the water out from under the bell and, as a result, receive a powerful push forward, also called the jet method of movement.