Is the total diposable biproduct of a fishe's gills a hydrocarbon?

Question

From the information I've read, The way it's vagely stated, is
the fish absorbs oxygen from the water. I know a water molecule is made up of 2 hydrogen adams and 1 oxygen adam, (H2O). So, the fishes gills must be disposing of the hydrogen.after the oxygen is obsorbed. If the carbon dioxide is also disposed of through the gills, total biproduct should be a hydrocarbon. Correct if I'm wrong.

Answer 1

No, the fish absorbs DISSOLVED Oxygen from the water.

H2O + O2. Gills (or lungs) do not break down water (or air) at the molecular level.

That is why aquariums have the airpumps to create bubbles in the water, to add dissolved oxygen. A fish would asphyxiate in water with no dissolved oxygen. I hope that helps!

Answer 2

Fish get oxygen with the aid of gills. They exchange CO2 x O2 that is dissolved in water.

If the mechanism you propose was real two water molecules would make 1 O2 molecule and 4H atoms would form H2, gas that would be mixed temporally with water and then released, in a huge storm lightning would make hell of a explosion.