References and Further Information: 1  Morrissey, J.F. and J.L. Sumich. 2012. Introduction to the Biology of Marine Life (10th Edition). 2  University of California Museum of Paleontology. Bilateral (left/right) Symmetry.
A lot of things. For one, Whale sharks are fish and use gills to breathe. Blue whales are mammals. The blue whale is also bigger than the whale shark. The tail structure is also different if you watch the whale shark swim, it uses its tail in a side to side motion while the blue whale uses a up and down movement.
Shark size varies according to the species. The largest shark is the whale shark which is up to 41 feet long. The great white shark is up to 20 feet long. Bull sharks can reach up to 11 feet.Tiger sharks can measure between 10 to 14 feet.he largest shark is the whale shark which is up to 41 feet long. The great white shark is up to 20 feet long. Bull sharks can reach up to 11 feet.