Assertion: grass carp | /r/HasProperty | introduced into waterway
Facets:
value: historically
type: TEMPORAL
Source sentences:
text: “Grass carp have been detected in low numbers in all the Great Lakes, except Lake Superior, since the early 1980's (Lake Erie in particular) and have historically been introduced into waterways for aquatic nuisance vegetation control in some Great Lakes states,” Popoff said.