Extraordinary migration of giant Amazon catfish revealed

The dorado catfish travels 11,600km from the Andes to the mouth of the Amazon and back, but is threatened by dams and miningA giant silvery-gold catfish undertakes the longest freshwater migration of any fish, according to new research, travelling 11,600km from the Andes to the mouth of the Amazon and back.The dorado catfish, which can grow up to 2 metres long, is an important source of food for people along the world’s longest river. It was suspected of making a spectacular journey, but a