Assertion: perch's fin | /r/HasProperty | pectoral
Facets:
Source sentences:
text: They use their pectoral fins, caudal peduncle, and gill covers for locomotion.
text: They use their pectoral fins, caudal peduncle, and gill covers for locomotion.
text: Perch have paired pectoral and pelvic fins, and two dorsal fins, the first one spiny and the second soft.