|Part of this article are based on realistic Speculation and might not turn out to be correct.|
Sharks are animals that are believed to be in Grand Theft Auto: Vice City and Grand Theft Auto: San Andreas. They are real-life sea creatures that people have claimed to have seen in the waters of Vice City and San Andreas. There is an ongoing debate to whether they actually exist in-game or not. Sharks will appear in Grand Theft Auto V.
GTA Vice City
Many players have claimed to have spotted sharks in the waters of Vice City. Most players claim that they are just mods, but others say that they are very rare. However these creatures do in fact, exist in the waters of Vice City on all three versions of the game (PlayStation 2, PC and Xbox versions).
These sharks cannot be killed by the player and will not attack Tommy Vercetti, even if the player jumps into the water next to it, although doing this will kill the player anyway by drowning. Its not easy to keep track of sharks as they swim out past the games barriers and they can easily disappear. The place you are most likely to find them, is south of Vice City or behind the Vercetti Estate.
GTA San Andreas
Much like GTA Vice City, many players of Grand Theft Auto: San Andreas have claimed to have seen sharks in the waters of San Andreas. Like above, most players say they are just mods, but others claim the sharks are just rare. Some people have stated that sharks actually attack Carl Johnson and kill him, but this is unlikely, most likely the sharks will swim away like all the other marine life is programmed to do. As in Vice City the sharks are said to be invulnerable to damage.
Players often mistake Dolphins for Sharks because they look very similar in game. The IMG tool for gta3.img on GTA San Andreas proves that sharks are in the game coding, as it states the shark.dff file is in game. The shark does not attack Carl and highly resembles a White Tip Shark. It is said that sharks are only found underneath the Gant Bridge although sharks probably do not spawn at all as the shark.dff is most likely missing the piece of code that allows the shark to spawn in-game.
A pre-release screenshot for GTA V shows a scuba diver swimming in the ocean with a shark that appears to be a composite of several real-life shark species, namely the Grey Nurse Shark (the pectoral and pelvic fins), Tiger Shark (nose shape and eyes), and the Great White Shark (plump body). It is currently unknown if there will be more than one species in the game, if they are capable of attacking the player, or if they can be killed.