Shark

The Shark is a fish that can be found in the ocean from June through September, from 4pm to 9am. The shark has a "Huge (with fin)" shadow size when seen in the water. It is one of two fish to be in two groups: the 15,000 group and as the most prominent member of the shark group. It is also the longest fish in the game, at about 550 centimeters. The shark will win any "size" fishing tourney due to its size.

Donating in Wild World
Blathers has this to say upon donation:
 * '"Shark flesh is often used in processed seafood products, eh wot? As such, you might wonder why it isn't grilled like other fish, am I correct? Well, shark tends to reek of ammonia, you know. And that is NOT good."

Donating in City Folk Blathers will say this upon donation: "If one were so inclined, one could sit around pulling shark teeth all day. They simply keep growing back! I've heard that over a shark's lifetime, it will go through thousands of teeth, which is disconcerting. ...Anyhoo, no toothpaste needed! How appropriate for a creature that's been around since the dinosaurs!"

http://images4.wikia.nocookie.net/__cb20100805143913/animalcrossing/images/thumb/1/12/Catching_a_Shark.png/180px-Catching_a_Shark.png

Further Information
The great white shark, Carcharodon carcharias, is an amazing fish that has been around since long before the dinosaurs existed. It can be found in waters all over the world, in every ocean. Unlike bony fish, sharks have no bones; their skeleton is made of cartilage, which is a tough, fibrous substance, not nearly as hard as bone.

Wild World

 * Size: 17.6 feet
 * Habitat: Ocean
 * Season: Summer and fall
 * They lose and replace their teeth often. Their teeth, however, are actually scales.

City Folk

 * Size: 17.7 feet
 * Habitat: Ocean
 * Season: Summer (June–September)
 * These have rows of teeth that can be replaced indefinetly. Lucky shark!
 * Time: 4pm to 9am

Tips for Catching Sharks
At the right time of day, sharks are actually surprisingly common, with about 1 in 3 catches being a shark itself. It is often considrered rare, but this is likely due to its nocturnal tendencies; there are few players who are willing to play well into the night.

Having a lighthouse, was proven by Nintendo, to increase the chance of sighting rare fish, and as a result will cut the time needed to find one. A Clover is also thought to improve the odds.A shark will nibble 4 times but on the fifth it will bite,.