ABSTRACT
When a fish swims along, it will follow a path of action with its body producing a sinusoidal wave to propel the fish.
When a fish turns, it will flick its tail into the corner that it is turning, a bit like the rudder of a boat. The flicking of the tail will swing the head into the turn. The body of the fish will stay slightly curved with the sinusoidal wave running through it as it completes the turn. Each swish of the tail will be greater on the inside of the turn than the outside.
