How does fish move in water?

Hint: We all know that fish moves in water through fins, tails, muscles, and body. This movement is called the locomotion of the fish. The skeletal system forms the framework of the body and is mainly composed of the bones and tissues. The skeletal system helps in the movement process.

Complete answer:
Moving in water is very much tough and challenging. So The important point is, fish adapted their body to move in the water. Fishes have three methods for their movement in the water. These are:
- The body movement by the alternate contraction and expansion of the muscles that are called myosomes.
- The second method is the appendage movement, which is called fins.
- The jets of water expelled from the gills when they respirate, which results in a movement.

There also have some kind of alternative methods of movements like:
- Jumping
- Climbing
- Crawling
- Flying, etc.

Method: The structure of fishes help in their locomotion, mainly fins and tails. At the time of swimming, the tail is beat from side to side by relaxations and alternative contraction of the muscles, which is on the opposite of the vertebral column. It is followed by the bending of the tail to one side and it is called the backstroke. Then the tail is extended and straightened and it is called the forward stroke. The body moves forward because of these strokes. So, the body of fish moves forward rapidly in water.

Note: The fish use back fins. It is called the Caudal fin. It helps them to move through the water. The body of fish resembles the shape of a boat. The body tapers down at both ends, head and tail are comparatively smaller than the mid part of the body, hence we say their body is streamlined. This shape allows water to glide over them thus enabling swift and efficient movement. Fishes have a skeleton that is covered with muscles.