Four species of non-indigenous Asian carp are expanding their range in U.S. waterways, resulting in a variety of concerns. Three species -- bighead, silver, and

Four species of nonindigenous Asian carp are expanding their range in U.S. waterways, resulting in a variety of concerns and problems. Three species-bighead, si

Four species of non-indigenous Asian carp are expanding their range in U.S. waterways, resulting in a variety of concerns and problems. Three species—bighead,

Asian carp were first introduced into the southern United States in the early 1970s to remove algae from farmed catfish ponds. Flooding in the early 1900s cause