From the photographer: "Mackerel scad (Decapterus macarellus) clear the way for an adult great white shark (Carcharodon carcharias) as he swims near the surface off the coast of Mexico's Isla de Guadalupe biosphere reserve. The mackerel are quite good at 'photobombing' the sharks at Guadalupe and have ruined many a shot for me. Fortunately, for this shot, they provided some nice framing for the shark, instead."
Credit: George T. Probst
View all winning entries for the 2015 World Ocean Day photo contest on the National Ocean Service website.
Date 8 June 2015, 14:00
Source Photobombing
Author NOAA's National Ocean Service https://www.flickr.com/people/40322276@N04
Source: https://commons.wikimedia.org/wiki/File:Great_white_shark_scatters_mackerel_scad.jpg

The great white shark (Carcharodon carcharias), also known as the great white, white pointer, white shark, or white death, is a species of large mackerel shark which can be found in the coastal surface waters of all the major oceans. The great white shark has no known natural predators other than the killer whale. The great white shark is arguably the world's largest known extant macropredatory fish, and is one of the primary predators of marine mammals.