Silver carp, Hypophthalmichthys molitrix, caught in a fyke net in Danube Delta, Romania. A freshwater cyprinid fish native to north and northeast Asia. More silver carp are produced worldwide in aquaculture than any other species. It has been introduced to, or spread into via connected waterways, at least 88 countries around the world. The silver carp reaches an average length of 60 to 100 cm with a maximum of 140 cm.