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In page Nile perch:

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Despite being a successful invasive species, the fish faces threats. Being a species of megafauna, the most obvious threats to the species are overfishing and the use of illegal fishing gear, as well as invasive water hyacinths. Prey depletion is also a factor, as it decreases the size of the fish and makes it vulnerable to larger predators, such as crocodiles.[citation needed]