Assertion: hatchery trout | /r/HasProperty | stocked in the river
Facets:
value: from 1911
type: TEMPORAL
value: to 1925
type: TEMPORAL
Source sentences:
text: Natural waterfalls and two major dams have isolated Russian River steelhead from freshwater rainbow trout forms above the impassable barriers; a 2007 genetic study of fin samples collected from steelhead at 20 different sites both above and below passage barriers in the watershed found that although 30 million hatchery trout were stocked in the river from 1911 to 1925, the steelhead remain of native and not hatchery origin.