From the novella, The Old Man and the Sea
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Well, a few reasons here. The shark is a predator and Santiago is a predator as well. Although Santiago dislikes sharks (especially when they feed on his Marlin) he sees them both as hunters. They are both at the top of their respective food chains. Hemmingway also wants to show them as being old products of the sea. This is their element and Santiago's claw and the shark’s teeth symbolize this.