Oxygen is essential for life. It forms the backbone of water. It's the most crucial element for vertebrates; we need it constantly. Just a few minutes is the maximum time we can be without it; no other element is as vital to supporting life as we know it.
As vertebrates, fish have these same needs for oxygen. Only instead of breathing it in from the air, they extract it from the water with their gills. This oxygen they are extracting isn't being torn from the water molecules themselves. They aren't pulling the the O from the H2O. The oxygen they absorb is 'dissolved oxygen', stable O2 molecules that become dissolved into the water through aeration and agitation, the same O2 that we breathe from the air.
Click 'Read more' down on the right to see the full article...
As vertebrates, fish have these same needs for oxygen. Only instead of breathing it in from the air, they extract it from the water with their gills. This oxygen they are extracting isn't being torn from the water molecules themselves. They aren't pulling the the O from the H2O. The oxygen they absorb is 'dissolved oxygen', stable O2 molecules that become dissolved into the water through aeration and agitation, the same O2 that we breathe from the air.
Click 'Read more' down on the right to see the full article...
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