I would be more curious about WHY a fish that is a reported vegetarian has gone to being a carnivor in the Sepik river, and attacking people. And WHY a peacefull, vegetarian fish exhibits prey hunting habits?
Multiple sites, courtesy of google repeat the above statements. So why? Is it possible that they are more along the lines of targets of opportunity? Similar to catfish who eat anything that doesn't seem to eat them first. If someone has more info, or insight along these lines I would greatly appreciate hearing from you.