Assertion: mayfly | /r/HasProperty | considered in most parts of north america
Facets:
value: always
type: TEMPORAL
value: as many other species of fish
type: OTHER
value: as a main
type: MANNER
Source sentences:
text: In most parts of North America the Mayfly has always been considered as a main or 'the' main staple food source of trout and many other species of fish.