Swimming: How Does a Fish Swim?
Anatomy of a FishWhile watching your pet fish swimming around in their watery home, you may find yourself wondering how they seem to swim so easily. Their skeletons and muscles work together to allow them to swim, along with their fins and something called a swim bladder. Using the Skeleton and Muscles The primary function of the skeleton is to aide movement of other parts. The skull is the only truly fixed part of a fish. It does not move in and of itself but acts as a point of stability for other bones. These other bones act as levers that cause movement of the fish’s body. While the bones provide the movement, the muscles supply the power. A typical fish has hundreds of muscles running in all directions around its body. This is why a fish can turn and twist and change directions quickly. Using the Fins As water passes over its body, a fish uses its fins to thrust in the direction it wishes to go. The caudal fins supply most of the thrust. The pelvic, dorsal and pectorals assist in s...