Having a fin, fins, or finlike parts. Often used in combination: single-finned; multifinned.
- Having fins.
- Having no spines to their fins, the Gadids used, in Cuvierian days, to be associated with the herrings, Salmonids, pike, &c., in the artificially-conceived order of Malacopterygians, or soft-finned bony fishes.
- The Squamipennes, or scaly-finned fishes, are principally found in the seas of southern Asia, and especially near coral reefs.