plural of fin de siècle

(ichthyology) Either of a pair of fins on either side and towards the rear of a fish.

(ichthyology) A fin located on the underside of a fish behind the anus.

The tailfin of a fish and other aquatic vertebrates.

(ichthyology) Either of two fins located on each side of a fish just behind the head.

A fin located on the backs of fish and some marine mammals.

(ichthyology) A fin, usually paired, located ventrally below the pectoral fins of a fish.

(ichthyology) A soft, fleshy fin located behind the dorsal fin and just forward of the caudal fin, found fish of certain families, believed to have some sensory function.

(ichthyology) One of a set of fins that look like horns on either side of the broad head of a manta ray.

A whale of the rorqual family (Balaenoptera physalus).