To test the smooth transition from above to below the surface of the murky water this animation lowers the camera to sit on the water level and then lets the waves wash over it. Once below the water the visibility has been increased to 30 ft to be able to see more. In reality nothing would be seen more than a few feet in front of the camera at the surface and the light would rapidly be absorbed at any depth.
Not much effort went into modelling the carp or the animation. To improve this it also needs some small scraps of stuff floating in the water and other small particles. These should be given no gravity but will require some physics and collisions to suggest any current and movement of the fish if possible.