How are the fish moving?

How are the fish moving?

     The fish have a negligible weight in the water since their density is almost similar to water, but they must remain in equilibrium and withstand the movements of currents. For this, they must use their fins. The swimming of fish differs according to their body and the reason of their displacement for example a fast swimming to attack or escape from a predator. Swimming is by rippling of the body and caudal fin while the head serves as a counterbalance with the tail as engine. It is possible to distinguish three types of swimming.

     Sustained swimming:

When a fish tries to attack, or during a leak, or to protect itself from danger when a stone is thrown into the water, or a fishing lure is propelled loudly, this swimming is often short-lived.

     Transient swimming:

This mode of movement is made by short flippers movements also by straight fast departures that by sharp turns. It is used to attack.

     The slow swimming:

The fish behaves like a bird in the sky, it activates its fins with savings. It is used to move slowly or to stabilize with the current of water.