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Dolphins can swim as fast as 54 kilometers per hour near the surface.

"What is the fastest a dolphin can swim? Near the surface, no more than 54 kilometres per hour. Why? Because it hurts it to swim faster.

Those are the findings of a pair of researchers from the Israel Institute of Technology in Haifa. But tuna, they say, do not suffer the same problem.

Gil Iosilevskii and Danny Weihs carried out a series of calculations to model the tail and fins of fish such as tuna and mackerel, and cetaceans such as dolphins. The aim was to determine what limits the maximum speed at which these creatures can swim.

The researchers found that although muscle power is the limiting factor for small fish, this is not the case for larger and more powerful swimmers such as tuna and dolphins."
Source: https://www.newscientist.com/article/dn13553-dolphins-swim-so-fast-it-hurts/

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