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.
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SS United States, United States Lines. Speed:38.32 Knots on her trials, although she was reputedly capable of steaming at over 40 knots. Still holds the transatlantic speed record (the Blue Riband), 34.51 knots, set in 1952.
The Blue Riband record for fastest transatlantic crossing by a steamship is held by SS United States, which achieved an average speed of 34.51 knots during its maiden voyage in 1952.
The positive form of "fastest" is "fast."
The world's fastest mammal, the cheetah, can reach speeds of up to 70 miles per hour, while the world's fastest fish, the sailfish, can swim at speeds of up to 68 miles per hour. Therefore, the cheetah is faster than the sailfish.
The peregrine falcon is the fastest animal in the air, reaching speeds of over 240 mph.
the fastest mixed dog is named sayde
Objects move fastest when they are closest to the primary object. In the case of Mercury, it moves fastest when it is closest to the Sun.