If you can enlarge the picture named "mighty Jupiter Moon Ganymede" you better see how much water (and therefore Oxygen) that Ganymede contains

 

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Ganymede (moon) - Wikipedia

Ganymede (moon) - Wikipedia

en.wikipedia.org

Jupiter's Moon Ganymede - Universe Today

Jupiter's Moon Ganymede - Universe Today

universetoday.com

Ganymede: Facts About Jupiter's Largest Moon | Space

Ganymede: Facts About Jupiter's Largest ...

space.com

In Depth | Ganymede – NASA Solar System Exploration

Ganymede – NASA Solar System Exploration

solarsystem.nasa.gov

Mighty Jupiter moon Ganymede pictured in close-up - BBC News

Mighty Jupiter moon Ganymede pictured ...

bbc.com

Bizarre Bulge Found on Ganymede, Solar System's Largest Moon

Ganymede, Solar System's Largest Moon

nationalgeographic.com