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Decline in the population of Indian native fishes due to introduction of Clarias gariepinus in river Yamuna can be categorised as

1. Alien species invasion
2. Co-extinction
3. Habitat fragmentation
4. Over exploitation

Correct answer: Alien species invasion

Solution

Clarias gariepinus is not native to the Yamuna; its introduction into the river makes it an alien species. The decline of native fishes due to this introduction is therefore an example of alien species invasion.

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