Once upon a time, there was this thing called the library.
Then the internet happened. Folks got either too busy or too lazy and decided it was too much effort to leave their house to go to the library. So much so, that libraries everywhere are now shutting down.
While this thread is admittedly amusing, it's more sad to me that you come here first to look into a topic as easily researched as the Nile Perch.
They didn't have the internet when I was in school. Do you have any idea how much of a gift this thing is for people your age? Do you have any idea how much folks my age and older would have benefited from such an invention?
Holy crap man.... Take some time away from looking at porn, playing Farmville and watching fail videos on Youtube (I'll admit it's tough sometimes). Check out Wikipedia. Learn to play guitar. Learn to type. Learn Spanish. Better yourself. It's all free and it's right there, just past all the crap.
Do this. Start with Wikipedia and the links that Rasta Fish cited. Check those out and come back with questions. Beyond the obvious issue of destruction of species diversity in the basin, there are deeper issues at play regarding economics and politics.
Read up a bit. Come back and start another thread with a specific question about the topic. Like Charlie said, we don't mind helping you out, just show that you've put in a bit of effort first.