Do sharks really never stop moving?

In order to breathe sharks have to keep moving. They have to engulf water to extract the oxygen in the water and then the rest of the water filters out of their gills. If the water current is very strong they can stay still.

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  1. What about the Port Jackson Shark — I had read somewhere that that is the one shark that can lie still and still be OK, is this fact or rumor?

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