"The Nile perch (Lates niloticus) is an important food fish in Africa and a prized catch for sport fishermen, but the species is also a massive environmental nightmare. In fact, the Nile perch is massive in more ways than one. It's a giant among fishes, reaching a length of up to 6 feet and a weight of more than 500 pounds. Anything that big eats a lot, and when misguided humans have introduced the Nile perch into new aquatic ecosystems (most notably, Lake Victoria in East Africa), it has caused catastrophic declines among native fish populations." (Quoted from article)