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What is the fastest sea creature in the world how fast is it?

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Swordfish can swim up to 110 km/h (68 mph).

It's difficult to measure but numerous source say it's the sail fish but that was when it was leaping and only for short bursts. The dolphin is the fastest swimmer over longer distances (when alarmed), but perhaps the the killer whale is faster being able to catch anything it chases.

It also depends on what and how it's measured (short distance) vs. long distance, or jumping/leaping, etc.