Assertion: bluefin tuna's number | /r/HasProperty | killed in purse seines
Facets:
value: from the 1960s
type: TEMPORAL
Source sentences:
text: From the 1960s to the late 1980s, huge numbers of some species of dolphins and porpoises were killed in purse seines set for tuna, perhaps 200,000 of these marine mammals each year.