People most often see Oarfish washed up on beaches. Encounters with live Oarfish are rare. They are sometimes seen on the surface, and this may contribute to tales of sea serpents.

Regalecus glesne Ascanius, 1772
Two 3 m long Oarfish washed ashore at Texel island, The Wadden islands,The Netherlands, May 2009.
The Oarfish is reported to be the longest of all fishes. It has a ribbon-like body that has been reliably documented to grow to 8 m in length, however specimens up to 17 m in length have been reported.
It is metallic silver with blotches and wavy markings on the body, and pink or red fins (Oarfish colouration page).
This species has a concave head profile and a highly protrusible mouth (a characteristic of the order Lampridiformes). It has a dorsal fin that runs the entire length of the body, but lacks an anal fin. There are tiny spines projecting laterally off each caudal and pelvic fin ray.

The derivation of the common name is uncertain. It may refer to the oar-shaped body, or the long oar-like pelvic fins, or possibly to reports that as the fish swims the pelvic fins scull the water like oars.
The Oarfish is found worldwide in all tropical and temperate marine waters. It is thought to live at depths between 20 m and 200 m, where it feeds largely on invertebrates and fishes. 
Although several species of oarfishes have been described, there is now believed to be only one species.

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