What is the fastest marine animal?

The fastest marine animal is the black marlin (Istiompax indica), capable of swimming at speeds of up to 82 miles per hour (132 kilometers per hour). Black marlins are large predatory fish found in the Indian and Pacific Oceans. Their streamlined bodies, sharp dorsal fins, and powerful tails allow them to reach such high speeds, which help them catch prey like smaller fish and squid. This incredible speed makes them one of the most sought-after game fish for sport fishing.