Any small animal's metabolic rate is higher/faster than the larger/bigger ones. And breathing is positively correlated with metabolism. Thus small fish breath faster than large fish.
Yes, Fish can breathe under unlike us they have gills instead of lungs.
The whole of the parts of the gills allows fish to breath. Gills to fish are what lungs are to us.
The feces from various fishes fertilize the world's seabeds, whose rich plant life creates oxygen for us mammals to breathe. That's important.
Pretty sure they aren't.
No one anywhere is faster than Usain Bolt.
faster
You need an atmosphere more than just for breathing but yes, an atmosphere is needed in order for us to breathe oxygen (it's in our atmosphere).
Fishes
Fishes of corse any kind of fishes !
they are designed for speed and have larger muscles than us.
the answer is breathe.
In fact, distant parts of the Universe are moving away from us faster than the speed of light.