Its tail has a top fin much larger than the lower fin. There are three prominent ridges running along each side of the shark's body. It is a filter feeder and sieves enormous amounts of plankton to eat through its gills as it swims. SIZE A scuba diver above a Whale shark. It is the largest fish in the world.
Whale sharks are filter feeders who sieve their tiny food through their large gills.
The whale shark is a filter feeder that sieves small animals from the water. As it swims with its mouth open, it sucks masses of water filled with prey into its mouth and through spongy tissue between its 5 large gill arches. After closing its mouth, the shark uses gills rakers that filter the nourishment from the water. Anything that doesn't pass through the gills is eaten. The water is expelled through the sharks 5 pairs of gill slits.