Mon Prof Augmenté
From Mountain Stream to Sea
Age 10 · Nature
Near its source a river is cold and fast and full of oxygen, but as it nears the sea it gets warmer, slower and muddier. Each stretch has its own fish, because each fish needs a different amount of oxygen.
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Age 10: open this week
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In the picture
- Trout in the cold, fast stream: it needs lots of oxygen
- Grayling in the gentler stretch: clear, cool water over gravel
- Pike in the winding stretch: it hides among the reeds in calmer water
- Bream in the slow, muddy lower river: it can live with less oxygen
Examples
- A fizzy drink keeps its bubbles longer when it is cold than when it is warm, and cold water holds more oxygen in the same way.
- A fish tank has a bubbler to add oxygen, much like a splashing mountain stream mixes air into the water.
Key takeaways
- Cold, fast water holds more oxygen than warm, slow water.
- Trout live near the source, while bream and carp live near the mouth.
Quiz: From Mountain Stream to Sea (Age 10)
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Which kind of water holds more oxygen?
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Which fish lives in the cold, fast water near a river’s source?
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Why can bream live in the slow, muddy lower river?
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