Mon Prof Augmenté
Lagoon Oysters and Tide-Flat Oysters
In a lagoon, oysters stay underwater all the time. On a coast, the tide pulls the water away and the oysters close their shells.
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Age 9: open this week
Browse Age 9
In the picture
- Open oyster shell under water, with ropes and a wooden frame above.
- Pale food particles drifting past the open shell.
- Closed oyster shell in a mesh bag on wet mud.
Examples
- A garden sprinkler left on all day keeps giving water; one on a timer stops between cycles.
- A fish in a full tank can swim and feed; a fish in a drained pond waits for water to return.
Key takeaways
- Oysters feed by filtering tiny food from the water.
- When the water is gone, they shut their shells and stop feeding.
Carry on in the app
Three questions on this lesson. It has left the free week, so its quiz is for subscribers.
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