Shark sticks fire a 12 gauge shotshell. They are fired by contact with the shark so the range would be something less than a foot.
For the falling out of the boat scenario a 44 Ruger with short barrel might work, but you'd want a non-expanding bullet. (The water would cause a hollow point to expand prematurely unless the muzzle contacted the shark's hide.) A revolver could be expected to cycle underwater where a self loader might not.
You realize this is going to get you into deep doo-doo with PETA?
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