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'Alien species invasion leads to extinct...

'Alien species invasion leads to extinction of indigenous species' - Justify this statement by considering two animals as examples.

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Two examples are :
(a) The Nile perch introduced into Lake Victoria in East Africa led eventually to the extinction of an ecologically unique assemblage of more than 200 species of cichlid fish in the lake.
(b) Illegal introduction of the African catfish Clarias gariepinus for aquaculture purposes is posing a threat to the indigenous cat fishes in our rivers.
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