Botany - Biodiversity and its Conservation Question with Solution | TestHub

When alien species are introduced unintentionally or deliberately for whatever purpose some of them turns invasive and cause decline or extinction of indigenous species. The environmental damage caused and the threat posed to our native species by invasive species like carrot grass (Parthenium), Lantana and water hyacinth (Eichhornia).
The recent illegal introduction of the African catfish Clarias gariepinus for aquaculture purposes is posing a threat to the indigenous catfishes in our rivers.