Assertion: bluefin tuna's number | /r/CapableOf | decrease by early 1990s
Facets:
value: through excessive harvesting
type: CAUSE
value: to only 22,000 animals
type: OTHER
Source sentences:
text: For example, in 1975 there were an estimated 150,000 bluefin tuna in the western Atlantic Ocean, but by the early 1990s this number had decreased by 90% through excessive harvesting, to only 22,000 animals.