fishes swim with fins and
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Answer:
Fish locomotion is the variety of types of animal locomotion used by fish, principally by swimming. This however is achieved in different groups of fish by a variety of mechanisms of propulsion in water, most often by wavelike movements of the fish's body and tail, and in various specialised fish by movements of the fins. The major forms of locomotion in fish are anguilliform, in which a wave passes evenly along a long slender body; sub-carangiform, in which the wave increases quickly in amplitude towards the tail; carangiform, in which the wave is concentrated near the tail, which oscillates rapidly; thunniform, rapid swimming with a large powerful crescent-shaped tail; and ostraciiform, with almost no oscillation except of the tail fin. More specialised fish include movement by pectoral fins with a mainly stiff body, as in the sunfish; and movement by propagating a wave along the long fins with a motionless body in fish with electric organs such as the knifefish.
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Explanation:
The scales present in the outer body part of fishes act as a cover to protect them from predators, injuries, and parasites.
Fishes swim by flexing their streamlined bodies and tail back and forth. They stretch the muscles on one side and relax the muscles on the other side. This motion helps them to move forward (swim). The fishes use their caudal fin (back fin) to push themselves through the water.
Thus, a fish swims with the help of streamlined body and the fins.