what is the biggest fish in the world?

whale shark

The whale shark thinks itself that it is the great fish but of the world, thinks that it measures between 18 and 22 meters in length. I believe that the second in size can be the white shark, I have a photo of a white shark that according to my estimation must measure between 12 and 15 meters, is gigantic! Greetings.

The whale shark is generally considered to be the world's largest fish. http://en.wikipedia.org/wiki/Whale_shark

They are a neutral brownish gray with lighter stripes and spots. "The body is mostly gray with a white belly; three prominent ridges run along each side of the animal and the skin is marked with a "checkerboard" of pale yellow spots and stripes." : Wikipedia

The marine sunfish, Mola mola, may be the world's largest bony fish. http://en.wikipedia.org/wiki/Ocean_Sunfish

the whale shark is the biggest fish in the world.

the whale shark, rhincodon typus. Although there are some cryptozoologists who believe that carcharadon megalodon still exists in the ocean's depths and if that's the case it would win hands down.

Whale shark.Their color is a little dull green or darker blue with white spots.

The whale shark!!!

ocean sunfish, I believe

sharks are not true fish