Question

how does a fish move

Answer 1

Fish swim by flexing their bodies and tail back and forth. Fish stretch or expand their muscles on one side of their body, while relaxing the muscles on the other side. This motion movesthem forward through the water. Fishuse their back fin, called the caudal fin, to help push them through the water.

Answer 2

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Most fish swim by body movements, not fin movements. The fins are mainly balancers, with the exception of the tail fin, which often acts as a final thrusting member, propelling the fish through the water. In normal, medium-paced to fast swimming, the action is initiated at the head end of the fish, and waves pass down the body, culminating in a flick of the tail. The dorsal and anal fins prevent the fish from turning over in the water; the paired fins also perform braking and turning functions.

In slow swimming, and in static balancing in the water, the pectoral fins are used. These fins are usually colorless, so that when the fish is still in the water, their gentle movement is unnoticed. Indeed, in a fish like the Siamese fighter (Betta), these “pectoral” fins must be looked for very carefully, in contrast to the bright colors of the rest of the finnage.

Some fish, particularly some of the African Cichlids and Sticklebacks, normally swim with the pectoral fins rather than the body, but this is an unusual habit and not the norm...

T.S ( ZAYER ).