After their introduction to the United States, Asian carp spread quickly. As their numbers grow, native fish populations are impacted, as is the aquatic habitat. Humans are at risk too; boaters have been injured by the silver carp as it jumps out of the water. The common and grass carps can be found in almost every state, though bighead and silver carps are mainly found in the Mississippi River drainage basin. Though black carp have been collected in the Mississippi River, they are not thought to be established yet.