The osprey had eaten the head of this carp by the time the photographer came along.The river was low and pools were drying out. It was the osprey-equivalent of shooting fish in a barrel.
The osprey has a sharp hooked bill, useful for tearing and spearing bits of the prey.
.. and very strong, powerful talons.
Suddenly the osprey flew off. It has positioned the fish so that it is lined up in an aerodynamically position: head first (or what is left of it).
The wingspan of an osprey can be nearly 6 feet.