How to Identify Shark Fins

Dorsal fins are an inevitable sight at the ocean whether you're swimming or boating. Knowing the difference between a shark's fin and a dolphin's fin could save your life, particularly if you're swimming.

Things You'll Need

  • Binoculars
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Instructions

    • 1

      Locate the dorsal fin in the water. Since sharks are swimmers and aren't stationary for very long, it's imperative that you learn how to look quickly at the dorsal fins and remember their shape.

    • 2

      If the fin is triangular and slightly slanted, it's a shark. If the fin is triangular but severely slanted and dramatically curved inward, then it's most likely a dolphin.

    • 3

      If you've identified a shark fin, get out of the water immediately. If you can’t tell because of a poor sighting, don't take chances–leave the water.