When did Asian carp come to the us?

The group of fish collectively referred to as "Asian carp" are actually made up of four distinct species: the Bighead Carp, the Black Carp, the Grass Carp and the Silver Carp. According to the US Department of Agriculture, the Grass Carp was the first to reach American waterways in 1963. This was followed by the introduction of the Black Carp in the early 1970's, the Bighead Carp in 1972 and finally the Silver Carp in 1973.