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The bodies of fishes are usually spindle shaped and streamlined. This makes it easy to move in water. There are also air filled swim bladders to make the body buoyant.

The skeleton of the body axis is covered by strong muscles . They are arranged serially segment by segment. During swimming , the front part of the body curves in one side and the tail part remains in the opposite side. It forms a loops. Then quickly the body and tail curve to the other side. This makes a jerk and pushes the body forward. A series of such jerks make the fish swim ahead. Tis is aided by the fins of the tail.

The paired and unpaired fins mainly help to keep the balance of the body and to keep direction.

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Q: What is a description of the mechanism of swimming in fishes?
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