The Shark is an animal in Far Cry 3
How to kill a shark[edit]
You can punch a shark but can't kill it with your bare hands
You can only kill a shark using your gun
However guns don't work while you are Swimming, so you need to find a big rock or something to stand on and then you can kill the shark.
Be Careful, sharks will eat you. That's what they do.
Alternatively, you can shoot a shark from a boat or perch. You can attract sharks by shooting fish.
You can run the shark over with a boat, this is much easier than shooting. NOTE: Animal Repellent Syringes are ineffective against sharks.