There are various sorts of fish on our planet, Earth. But the biggest fish in the world that is not a predator is without doubt the Whale Shark. Basically, picture "a shark the size of a whale." As its common name implies, its massive size will remind one that encounters it of whales. Do not worry if you encounter a Whale Shark because "although it may have 3000 sharply hooked teeth, they are only a few millimeters long." This massive whale-sized shark could easily swallow a diver even though "there is nothing to fear from that gigantic mouth because it is really just a big sucker." In other words it is a filter feeder that "feeds on plankton, krill, and macroalgae." While the Whale Shark feeds on the plankton and krill, "like a gigantic vacuum cleaner, it sucks up sea water and filters plankton from nearly a million liters of water every hour." At this rate, "That is more than enough to fill an Olympic sized swimming pool." Considering it's graceful nature, an encounter with a Whale Shark will not be a nightmare, but a very special occasion.
Considering how the whale shark eats a lot of plankton and krill, "anything this big that eats that much is sure to attract a crowd." In other words, "the whale shark is like a huge floating reef providing shelter for many species of fish and the odd leftover from that massive maw." Despite the whale shark almost constantly having its mouth open, "it is incredibly thick skinned. It's 15 centimeter hide is one of the thickest skins of any living animal."
