they swim. really.
Sea otter are nekton and plankton; they can float and swim.
Because there is salt in sea water and salt makes you float better so is easier to swim.
The fish that live at the bottom of the sea are equiped with a swim bladder and by adjusting the pressure in this organ they can go up or down easily as they swim.
You cant they do that so you cant swim to the next island
It is easier to swim in the sea because of the amount of salt in sea water the density of the water is greater which make you float more easily.
The Dead Sea is known for its high salt content, which makes it easy for humans to float on its surface.
The higher the salinity of the water the easier it is to float - the Dead Sea, the Caspian Sea, the Great Salt Lake.
cos if a dolfine cant swim in the sea water the dolfine will die
Sea water is easier to float in, but wave make it harder to swim in.
Because they are constantly swimming against the current of a river where as sea otters float around...kinda.
nothing much it would just float more than normal