Details
Regalecus glesne
Giant oarfish is a fish associated with open ocean. It is carnivorous and usually solitary. It remains widespread in parts of its range, but local habitat change still matters.
Map: Ecoregions 2017 © RESOLVE (CC BY 4.0) · Natural Earth (PD)
Its range is represented here by the Pacific, the Atlantic and the Indian Ocean, where it uses open ocean. Mobile species may shift habitat use with season, breeding sites, or food availability.
Typical length 300-800 cm, weight 50 kg-270 kg. It has a finned fish body plan, with proportions shaped by its habitat and mode of movement.
It is active in bouts across day and night and usually solitary. Spacing, group size, and visibility can change with season, feeding conditions, and breeding activity.
It is carnivorous. Food choice and foraging style are tied to life in open ocean, so movements often follow available food resources.
Breeding usually involves spawning, with eggs and young developing in suitable freshwater, coastal, or reef habitats.
Recorded scientifically as Regalecus glesne. It remains widespread in parts of its range, but local habitat change still matters. In this guide, size, habitat, and activity pattern are useful first clues for recognition.
