In the 1960s, Nile perch was introduced into Lake Victoria in Tanzania; rapacious and predatory, it led to the endangerment or extinction of native fish, and soon the very life of the lake was threatened. While this was an apt metaphor and cautionary tale for the unforeseen consequences of human actions, the story is complicated by the fact of the fishing industries that arose on the shores of the lake. Each day tons of perch are filleted and shipped to European and Japanese markets; Russian pilots, East Asian businessmen, and local fishermen and prostitutes all have their interests in the ongoing presence of the catastrophic Nile perch. For this prize-winning film, Hubert Sauper and his collaborator Sandor Rieder interviewed people from all facets of the local economy. One factory owner shows the filmmaker his toy fish that sings “Don't worry, be happy,” but a dissonant note is hit. As planes filled with fish fly overhead, famine abounds in Tanzania, and residents stave off hunger by feeding on discarded fish carcasses-another tragically apt metaphor.