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Go online with the search term "shark surf" and see what you think...
Sharks have vertical tail fins
Dolphins have horizontal tail fins
This particular dolphin is online so many times in images he, or she, should be autographing surf boards..
There is even an image of a South African surfer sharing the same wave with 2 dolphins if you are unsure about what you are really seeing
The rear edge of a dolphin's dorsal fin is curved, as can easily be seen in the second example posted by SLAYER69.
The rear edge of the fin in this picture is straight, making this creature a shark.
The tail fin argument is hardly ever valid because perspective can make the tail fin look either horizontal or vertical, depending on how you look at it.
But this picture, photoshopped or not, contains the shadow of a shark.