Brazilian fishermen pull fish from their net at low tide on sand flats at the mouth of the Amazon River in Curuca, May 17, 2009. Fishermen capture species ranging from mullet, bass, piraiba and piramatuba catfish, sardines and yellow weakfish, among others, in the mixture of fresh and saltwater that characterizes the mouth of the world's largest river. Picture taken May 17, 2009. REUTERS/Paulo Santos (BRAZIL ENVIRONMENT SOCIETY)