Choose the correct statement.

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(C) $1$. The Nile perch was introduced into Lake Victoria in East Africa (not West Africa),which caused the extinction of more than $200$ species of c

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The recent illegal introduction of the African catfish $Clarias$ $gariepinus$ for aquaculture purposes is posing a threat to the indigenous catfishes in our rivers.

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(C) $1$. The Nile perch was introduced into Lake Victoria in East Africa (not West Africa),which caused the extinction of more than $200$ species of cichlid fish in the lake. Thus,option $A$ is incorrect.$2$. Invasive weed species like carrot grass $(Parthenium)$,$Lantana$,and water hyacinth $(Eichhornia)$ cause environmental damage and pose a threat to our native species. Thus,option $B$ is incorrect.$3$. The illegal introduction of the African catfish ($Clarias$ $gariepinus$) for aquaculture is indeed posing a threat to the indigenous catfishes in our rivers. Thus,option $C$ is correct.

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