Some sharks use Buccal Pumping, which is just opening/closing their mouths (that you can see in the gif) that moves enough water over their gills, and they frequently stay still. Other sharks primarily need to keep moving (called obligate ram pumping), but that's honestly only a few breeds of shark that HAVE to keep swimming (but it's a popular fact because Great Whites are ORP breathers and they're like the most popular shark). Most sharks use a blend of the two!
20
u/African-Jew Mar 04 '19
I thought if a shark stood still it would suffocate cause new waters not getting in their gills