Sharks are fish that are feared by many people because they do attack. Most actually attack on accident. All sharks including the Helicoprion in the game are saltwater. However, three "spiny sharks" Acanthodes, Climatius, and Cheiracanthus are freshwater. Only one shark, the Whale Shark is uncatchable in the game. Sharks are Earth's oldest creatures in fact being around for about 400 million years.