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Which type of fish lives in freshwater but breeds in saltwater?

1. Potamodromous
2. Polydromous
3. Catadromous
4. Anadromous

Correct answer: Catadromous

Solution

Catadromous fish (e.g., eels) live in freshwater but migrate to saltwater to spawn. Anadromous fish (e.g., salmon) do the opposite — live in the sea and breed in freshwater. Potamodromous fish migrate only within freshwater.

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