Assertion: herring's fin | /r/HasProperty | single dorsal
Facets:
Source sentences:
text: One important feature is that they possess a single dorsal fin with no lateral line or spines, unlike other fish.
text: Herring have a single dorsal fin and protruding lower jaws and are silvery in color.
text: In addition, they have protruding lower jaws, a single dorsal fin, and soft fins without spines.