Assertion: bighead carp | /r/HasProperty | imported into the united states
Facets:
value: to remove excess or unwanted plankton
type: PURPOSE
value: in 1973
type: TEMPORAL
Source sentences:
text: Bighead carp and closely related silver carp (H. maltrix) were imported into the United States to remove excess or unwanted plankton, thus improving water quality at sewage treatment plants and aquaculture facilities.
text: Bighead carp and the closely related silver carp (H. molitrix) were imported to the United States to remove excess or undesirable plankton, thus improve water quality in sewage treatment plants and aquaculture facilities.
text: Bighead carp were first imported into the United States in 1973 by a private fish farmer in Arkansas who wanted to use them in combination with other phytophagous fishes to improve water quality and increase fish production in culture ponds.