Assertion: nile perch | /r/AtLocation | lake victoria
Facets:
value: in africa
type: LOCATION
value: in the 1950s
type: TEMPORAL
Source sentences:
text: Nile perch have been introduced to many other lakes in Africa, including Lake Victoria and the artificial Lake Nasser.
text: The Nile perch was introduced to Lake Victoria in East Africa in the 1950s, and has since been fished commercially.