Alien species are highly invasive and are a threat to indigenous species- Substantiate this statement with any three examples-

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When alien species are introduced- they turn out to be invasive and are responsible for decline or extinction of indigenous species- Three examples are-xA0-i- Cichlid fish which is found in Lake Victoria led to extinction of nearly 200 species which introduced Nile Perch into Lake Victoria-ii- The inclusion of invasive species such as carrot grass -Parthenium- Lantana and water hyacinth -Eicchornia- led to environmental damage of the native species-xA0-iii- The indigenous catfishes found in rivers are a major species of extinction by the introduction of African catfish Clarias gariepinus which is a major advantage for aquaculture purposes-

Alien species are highly invasive and are a threat to indigenous species. Substantiate this statement with any three examples.