Originally posted by: NedWebs
The river is more of an optical illusion of sorts, where things get reflected as though it were water (except the fish... they missed that detail). The effect of the water moving is a continuously moving (transparent background) graphic layer containing debri elements. The fish, a motion tween of a fish in an arc and one of a ring expanding to a fade.
Aside from the artwork, the majority of the animation elements are fairly basic, so you should have no problem recreating something like it. It might be a good starting point for you to help you become familiar with some of the basic Flash capabilities.