Silver Carp

The silver carp (Hypophthalmichthys molitrix) is a large, deep-bodied filter-feeding fish native to major river systems of eastern Asia, including the Amur, Yangtze, and Pearl rivers of China and Russia. It is easily recognized by its very low-set eyes positioned below the midline of the head and its large upturned mouth adapted for filtering plankton from the water. Silver carp are famous for their dramatic leaping behavior, launching themselves up to several meters out of the water when startled by boat engine noise or vibration, a trait that has caused injuries to boaters in areas where the species has become invasive. Introduced widely for aquaculture and water-quality management, silver carp have become a major invasive species in parts of the Mississippi River basin in North America.

• Deep, laterally compressed body with an overall silvery sheen and very small scales
• Eyes set unusually low on the head, well below the midline
• Very large, upturned (superior) mouth with no teeth in the jaws, used for filter feeding
• Keeled belly running from the throat to the anal fin
• Look-alikes: bighead carp has a similarly large head but darker mottled coloration and eyes positioned more centrally; grass carp has a terminal mouth and cross-hatched scale pattern

Silver carp are native to large, warm rivers and their associated floodplain lakes across eastern Asia, particularly the Amur River region and major Chinese river systems such as the Yangtze and Pearl rivers. They favor open water in rivers, reservoirs, and lakes with abundant phytoplankton and zooplankton, often congregating near the surface where food is concentrated. The species has been introduced to more than 80 countries for aquaculture and algae control, and has become notably invasive in the Mississippi, Illinois, and Missouri river systems of the United States, where it competes with native filter-feeding fish and disrupts food webs. It tolerates a wide range of temperatures and water conditions typical of large lowland rivers.

Silver carp are filter feeders, using specialized gill rakers to strain phytoplankton and zooplankton directly from the water column, allowing them to grow rapidly and reach large sizes on a diet unavailable to most predatory fish. They are best known for their startling jumping behavior, leaping explosively out of the water in response to boat motors or other disturbances, which in invaded waterways has caused significant boater injuries and given rise to the nickname 'flying carp.' Spawning occurs in flowing river sections during warm months, with females releasing enormous numbers of semi-buoyant eggs that drift downstream while developing; there is no parental care. Their prolific reproduction and efficient filter feeding allow silver carp populations to expand rapidly, often at the expense of native plankton-feeding species.