Fish use special senses to know when it's time to move. Like a fish with a super-smell, they can feel changes in the water and smell chemicals that tell them the river is near. When these signs change, they get excited and start their journey inland.
Examples
- A fish smells a river nearby and starts swimming up it like it's following a trail.
- A group of fish feel the water getting less salty and know they are close to their home.
- When a fish sees other fish starting their journey, it joins in too.
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See also
- How Do We Taste Different Flavors?
- What Causes the ‘Smell’ of a Rainy Day?
- How Do Fish Know When to Swim Upstream?
- How Do Animals Migrate Across the World?
- How Do Bees Know How to Make Honey?
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