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.
The fin whale (Balaenoptera physalus) is the second longest whale in the world, second only to the blue whale (Balaenoptera musculus). It can grow to a reported length of 89.5 â¦ ft (27.3 m) and weigh over 70 tons. It has a prominent, backswept dorsal fin.