Branchoria Cryptozoology Cryptozoology

Evidence-led pages on famous cryptids, real discoveries, folklore, and scientific tests.

Within Sea Serpents

The Real Fish That Looks Like a Serpent

Oarfish offer a grounded explanation for some sea serpent reports because their bodies already look strange, long and ribbonlike.

On this page

  • Why oarfish look so unnatural at the surface
  • Which sighting details they can explain
  • Where the oarfish explanation has limits
Preview for The Real Fish That Looks Like a Serpent

Introduction

Among the many proposed explanations for sea serpent reports, the oarfish is one of the strongest because it already looks remarkably like the creature people imagine. Long, ribbon-shaped, silvery, and often crowned with bright red fin rays, an oarfish can appear more mythical than many fictional monsters. When one of these deep-sea fish reaches the surface—often sick, injured, or dying—it presents exactly the sort of fleeting, unusual sighting that has fuelled centuries of maritime mystery. Scientists, museum collections, and marine historians frequently cite oarfish as a plausible source for at least some historical sea serpent accounts, particularly those describing long, serpentine bodies seen briefly at sea.[Natural History Museum+2National Geographic]nhm.orgNatural History Museum Fishes on DisplayNatural History MuseumFishes on Display - Natural History MuseumOarfishes in the water may be mistaken for sea monsters or sea serpents…Oarfish illustration 1 Unlike hypothetical cryptids, oarfish are real animals. The question is not whether they exist, but how much of the sea serpent tradition they can realistically explain.

Why Oarfish Look So Unnatural at the Surface

The giant oarfish (Regalecus glesne) is the longest known bony fish. Verified specimens commonly exceed several metres in length, and exceptional reports have reached well over 20 feet. Its body is extremely compressed from side to side, creating the appearance of a metallic ribbon moving through the water.[Florida Museum+2NOAA Fisheries]floridamuseum.ufl.eduFlorida MuseumOarfish – Discover FishesFeb 6, 2025 — Oarfish are greatly elongated, large fish in the family Regalecidae. This family, de…

Several features make the animal especially likely to trigger “monster” interpretations:

  • An elongated body that resembles a giant snake far more than a typical fish.
  • A bright red dorsal fin running almost the entire length of the body.
  • Red crest-like fin rays projecting from the head, giving it a crown-like appearance.
  • A silvery reflective surface that flashes in sunlight and can distort perception at distance.

The Oarfish | The Real Sea Serpent

Channel: Secrets Of The Deep Sea

Open on YouTube

Which Sighting Details They Can Explain

Many classic sea serpent reports share a cluster of characteristics that align surprisingly well with oarfish biology.

Long, snake-like bodies

The most obvious match is simple shape. Numerous historical descriptions speak of an animal resembling a giant serpent, ribbon, cable, or snake moving through the water. Oarfish naturally possess that profile without requiring exaggeration. Museum ichthyologists and marine historians have repeatedly noted that their appearance closely resembles traditional sea serpent imagery.[Natural History Museum+2Wikipedia]nhm.orgNatural History Museum Fishes on DisplayNatural History MuseumFishes on Display - Natural History MuseumOarfishes in the water may be mistaken for sea monsters or sea serpents…

Red manes, crests, or unusual head features

Some sea serpent accounts describe a mane, crest, or unusual ornamentation near the head. The oarfish’s prominent red fin rays provide a straightforward explanation for such observations. At a distance, these structures can appear like hair, feathers, or a dragon-like crest rather than fish anatomy.[Smithsonian Magazine]smithsonianmag.comfive real sea monsters brought life early naturalists 180953155Smithsonian MagazineFive “Real” Sea Monsters Brought to Life by Early NaturalistsOct 27, 2014 — Fleeting glimpses of oarfish could easily…Oarfish illustration 2

Partial sightings of enormous animals

Witnesses often report seeing only a section of a creature. An oarfish near the surface may expose part of its body while the remainder remains submerged. Waves, glare, and distance can make it difficult to judge length accurately. A fish several metres long may appear much larger, especially if observers assume the visible portion is only part of a far bigger animal.[Smithsonian Magazine]smithsonianmag.comfive real sea monsters brought life early naturalists 180953155Smithsonian MagazineFive “Real” Sea Monsters Brought to Life by Early NaturalistsOct 27, 2014 — Fleeting glimpses of oarfish could easily…

Washed-up “sea serpent” carcasses

Historically, some supposed sea serpent remains turned out to be ribbonfish or oarfish-like animals. Their unusual proportions and unfamiliar anatomy can appear bizarre even after death. Marine writers and museum collections have noted that stranded specimens have repeatedly been mistaken for monsters because they lack the familiar body shape people associate with fish.[Biodiversity Heritage Library+2NHSN]blog.biodiversitylibrary.orgthe quest for sea serpent oarfish orBiodiversity Heritage LibraryThe Quest for the Sea Serpent: An Oarfish or Something…Oct 29, 2014 — Fleeting glimpses of oarfish could…

Rare encounters that become memorable stories

Giant Sea Serpent Appears on Cabo Beach

Channel: We Love Animals

Open on YouTube

Named Cases That Strengthened the Connection

The connection between oarfish and sea serpent stories is not merely a modern sceptical suggestion. Naturalists have been making the comparison for generations.

Marine historians have pointed to nineteenth-century reports in which ribbonfish-like animals were initially treated as mysterious serpents. One frequently cited example concerns a supposed sea serpent found in Orkney in 1808, later argued by fish specialists to have been an oarfish or closely related ribbon-shaped fish.[The Oceanography Society]tos.orgThe Oceanography SocietyOceanography“Even the famous Sea Serpent, measuring fifty-six feet in length, cast up on the shore of Orkney in 1…

Historical records from northern Britain also describe unusually long ribbonfish captured by fishermen and discussed in the same cultural environment that produced sea serpent reports. Modern archive research has highlighted these fish as plausible contributors to local serpent traditions.[NHSN]nhsn.org.ukstories from the archive the northumbrian sea serpentStories from the Archive: The Northumbrian Sea SerpentSep 3, 2024 — The fish they had found was a type of deep-water ribbonfish, whic…

More recent strandings continue to demonstrate why the association persists. Specimens found in California, Mexico, Tasmania, and elsewhere routinely generate headlines describing them as “sea serpent-like” because their appearance is so dramatically unlike that of familiar coastal fish.[The Guardian+2The Guardian]theguardian.comOpen source on theguardian.com.Oarfish illustration 3

Where the Oarfish Explanation Has Limits

Although oarfish provide a convincing explanation for some reports, they cannot account for every sea serpent claim.

Scientists complete necropsy on deep-sea oarfish discovered in La Jolla

Channel: CBS 8 San Diego

Open on YouTube

        See on Amazon</a></div></div></article><article class="fr-book-card"><a class="fr-book-cover" href="https://www.amazon.com/s?k=Cryptozoology+A+To+Z+by+Loren+Coleman&amp;i=stripbooks&amp;tag=searcht-20" target="_blank" rel="sponsored noopener noreferrer" aria-label="Open Cryptozoology A To Z on Amazon"><span class="fr-book-cover-fallback">Book</span><img class="fr-book-cover-thumb" src="https://books.google.com/books/content?id=uOccNMgNSNYC&amp;printsec=frontcover&amp;img=1&amp;zoom=1&amp;edge=curl&amp;source=gbs_api" alt="Cover for Cryptozoology A To Z" loading="lazy" decoding="async" fetchpriority="low" referrerpolicy="no-referrer" onerror="this.hidden=true;this.closest('.fr-book-cover').classList.add('fr-book-cover-placeholder');"></a><div class="fr-book-info"><h4 class="fr-book-title"><a href="https://www.amazon.com/s?k=Cryptozoology+A+To+Z+by+Loren+Coleman&amp;i=stripbooks&amp;tag=searcht-20" target="_blank" rel="sponsored noopener noreferrer" title="Cryptozoology A To Z">Cryptozoology A To Z</a></h4><p class="fr-book-author">By Loren Coleman, Jerome Clark</p><p class="fr-book-desc">Provides broader sea-serpent and mystery-animal context.</p><div class="fr-book-actions"><a href="https://www.amazon.com/s?k=Cryptozoology+A+To+Z+by+Loren+Coleman&amp;i=stripbooks&amp;tag=searcht-20" class="fr-amazon-btn" target="_blank" rel="sponsored noopener noreferrer">
        See on Amazon</a></div></div></article><article class="fr-book-card"><a class="fr-book-cover" href="https://www.amazon.com/s?k=Fishes+by+Peter+B.+Moyle&amp;i=stripbooks&amp;tag=searcht-20" target="_blank" rel="sponsored noopener noreferrer" aria-label="Open Fishes on Amazon"><span class="fr-book-cover-fallback">Book</span><img class="fr-book-cover-thumb" src="https://books.google.com/books/content?id=sZYWAQAAIAAJ&amp;printsec=frontcover&amp;img=1&amp;zoom=1&amp;source=gbs_api" alt="Cover for Fishes" loading="lazy" decoding="async" fetchpriority="low" referrerpolicy="no-referrer" onerror="this.hidden=true;this.closest('.fr-book-cover').classList.add('fr-book-cover-placeholder');"></a><div class="fr-book-info"><h4 class="fr-book-title"><a href="https://www.amazon.com/s?k=Fishes+by+Peter+B.+Moyle&amp;i=stripbooks&amp;tag=searcht-20" target="_blank" rel="sponsored noopener noreferrer" title="Fishes">Fishes</a></h4><p class="fr-book-author">By Peter B. Moyle, Joseph J. Cech</p><p class="fr-book-desc">Provides biological context for rare fish such as oarfish.</p><div class="fr-book-actions"><a href="https://www.amazon.com/s?k=Fishes+by+Peter+B.+Moyle&amp;i=stripbooks&amp;tag=searcht-20" class="fr-amazon-btn" target="_blank" rel="sponsored noopener noreferrer">
        See on Amazon</a></div></div></article><article class="fr-book-card"><a class="fr-book-cover fr-book-cover-placeholder" href="https://www.amazon.com/s?k=Abominable+Science+Donald+R.+Prothero&amp;i=stripbooks&amp;tag=searcht-20" target="_blank" rel="sponsored noopener noreferrer" aria-label="Open Abominable Science on Amazon"><span class="fr-book-cover-fallback">Book</span></a><div class="fr-book-info"><h4 class="fr-book-title"><a href="https://www.amazon.com/s?k=Abominable+Science+Donald+R.+Prothero&amp;i=stripbooks&amp;tag=searcht-20" target="_blank" rel="sponsored noopener noreferrer" title="Abominable Science">Abominable Science</a></h4><p class="fr-book-author">By Donald R. Prothero, Daniel Loxton</p><p class="fr-book-desc">First published 2012. Subjects: Animals, mythical.</p><div class="fr-book-actions"><a href="https://www.amazon.com/s?k=Abominable+Science+Donald+R.+Prothero&amp;i=stripbooks&amp;tag=searcht-20" class="fr-amazon-btn" target="_blank" rel="sponsored noopener noreferrer">
        See on Amazon</a></div></div></article></div><div class="fr-section-footer"><div class="fr-browse-links" aria-label="Browse more on Amazon"><span class="fr-browse-links-label">Browse more on Amazon:</span><a class="fr-browse-more" href="https://www.amazon.com/s?k=Abominable+Science%21&amp;i=stripbooks&amp;tag=searcht-20" target="_blank" rel="sponsored noopener noreferrer">Abominable Science!</a><a class="fr-browse-more" href="https://www.amazon.com/s?k=Cryptozoology+A+To+Z&amp;i=stripbooks&amp;tag=searcht-20" target="_blank" rel="sponsored noopener noreferrer">Cryptozoology A To Z</a><a class="fr-browse-more" href="https://www.amazon.com/s?k=Fishes&amp;i=stripbooks&amp;tag=searcht-20" target="_blank" rel="sponsored noopener noreferrer">Fishes</a></div><p class="fr-disclosure">As an Amazon Associate I earn from qualifying purchases.</p></div></div></section>

Amazon book picks

Further Reading

Books and field guides related to The Real Fish That Looks Like a Serpent. Use these as the next step if you want deeper reading beyond the article.

Browse more on Amazon: Abominable Science! Cryptozoology A To Z Fishes

As an Amazon Associate I earn from qualifying purchases.

eBay marketplace picks

Marketplace Samples

Live-tested eBay searches with available results related to this page.

UsingUSA
Browse more oneBay.co.uk

Example items shown for inspiration; availability and pricing can change. Branchoria may earn a commission if you purchase through outbound eBay links.

Endnotes

1. Source: fisheries.noaa.gov
Title: giant oarfish
Link:https://www.fisheries.noaa.gov/podcast/giant-oarfish

<summary>Source snippet</summary><p>NOAA FisheriesThe Giant Oarfish24 Oct 2013 — In the last few weeks, not one, but two giant oarfish have washed up on the beach in Souther…</p>

2. Source: karlshuker.blogspot.com
Title: oarfish origins and very unlikely sea
Link:https://karlshuker.blogspot.com/2014/12/oarfish-origins-and-very-unlikely-sea.html

<summary>Source snippet</summary><p>OARFISH ORIGINS AND A VERY (UN?)LIKELY SEA…Dec 26, 2014 — Until then, no-one had suspected that this serpentine species could orient i…</p>

3. Source: Wikipedia
Link:https://en.wikipedia.org/wiki/Giant_oarfish

<summary>Source snippet</summary><p>Giant oarfishIts physical characteristics and undulating mode of swimming have led to speculation that it might be the source of many…</p>

4. Source: nhsn.org.uk
Title: stories from the archive the northumbrian sea serpent
Link:https://www.nhsn.org.uk/stories-from-the-archive-the-northumbrian-sea-serpent/

<summary>Source snippet</summary><p>Stories from the Archive: The Northumbrian Sea SerpentSep 3, 2024 — The fish they had found was a type of deep-water ribbonfish, whic…</p>

5. Source: reddit.com
Title: The oarfish, a true one in a million fish. These guys are
Link:https://www.reddit.com/r/Damnthatsinteresting/comments/n3oq0e/the_oarfish_a_true_one_in_a_million_fish_these/

<summary>Source snippet</summary><p>The oarfish, a true one in a million fish. These guys are…May 3, 2021 — They live 200+ meters deep in the ocean in calm waters…</p>
Published: May 3, 2021

6. Source: sea.com
Link:https://www.sea.com/

<summary>Source snippet</summary><p>HomeSea is a global technology company founded in Singapore in 2009. Our mission is to better the lives of consumers and small busi…</p>

7. Source: Wikipedia
Link:https://en.wikipedia.org/wiki/Oarfish

<summary>Source snippet</summary><p>OarfishTheir rarity and large size, and their habit of lingering at the surface when sick or dying, make oarfish a probable source of…</p>

8. Source: Wikipedia
Link:https://en.wikipedia.org/wiki/Sea

<summary>Source snippet</summary><p>SeaA sea is a large body of salt water. There are particular seas and the sea. The sea commonly refers to the Ocean, the interconnecte…</p>

9. Source: reddit.com
Title: TI L that “sea serpent” myths likely originated from Oarfish
Link:https://www.reddit.com/r/todayilearned/comments/hrs1av/til_that_sea_serpent_myths_likely_originated_from/

<summary>Source snippet</summary><p>TIL that the Oarfish is the likely source for most sea serpent tales. And although it's a deep water species its not to uncommon to see o…</p>

10. Source: reddit.com
Link:https://www.reddit.com/r/NatureIsFuckingLit/comments/1izhvse/diver_encountering_a_giant_oarfish/

<summary>Source snippet</summary><p>Diver encountering a Giant Oarfish: r/NatureIsFuckingLitAs a result, Oarfish are rarely seen near the surface, except on rare occasions…</p>

11. Source: sea.edu
Link:https://sea.edu/

<summary>Source snippet</summary><p>cation AssociationThrough Sea Education Association's curriculum, students explore their passion by experiencing the sea and engaging in…</p>

12. Source: youtube.com
Title: Every Real Sea Monster That Inspired Legends
Link:http://www.youtube.com/watch?v=KDKsrfIqE5g

<summary>Source snippet</summary><p>The Oarfish | The Real Sea Serpent…</p>

13. Source: youtube.com
Title: The Oarfish | The Real Sea Serpent
Link:http://www.youtube.com/watch?v=2ScL8wjWbps

<summary>Source snippet</summary><p>Oarfish | This Legendary Fish That Announces Tsunamis…</p>

14. Source: youtube.com
Title: Oarfish | This Legendary Fish That Announces Tsunamis
Link:http://www.youtube.com/watch?v=ecH-fY7a5IQ

<summary>Source snippet</summary><p>Did Sea Serpents Exist?…</p>

15. Source: nhm.org
Title: Natural History Museum Fishes on Display
Link:https://nhm.org/research-collections/departments-and-programs/ichthyology/fishes-display

<summary>Source snippet</summary><p>Natural History MuseumFishes on Display - Natural History MuseumOarfishes in the water may be mistaken for sea monsters or sea serpents…</p>

16. Source: nationalgeographic.com
Link:https://www.nationalgeographic.com/adventure/article/pictures-oarfish-philippines

<summary>Source snippet</summary><p>National GeographicMysterious 'Sea Serpent' Oarfish ResurfacesFeb 17, 2017 — Though not a reptile, the elongated fish is thought to be th…</p>

17. Source: smithsonianmag.com
Title: five real sea monsters brought life early naturalists 180953155
Link:https://www.smithsonianmag.com/science-nature/five-real-sea-monsters-brought-life-early-naturalists-180953155/

<summary>Source snippet</summary><p>Smithsonian MagazineFive “Real” Sea Monsters Brought to Life by Early NaturalistsOct 27, 2014 — Fleeting glimpses of oarfish could easily…</p>

18. Source: floridamuseum.ufl.edu
Link:https://www.floridamuseum.ufl.edu/discover-fish/species-profiles/oarfish/

<summary>Source snippet</summary><p>Florida MuseumOarfish – Discover FishesFeb 6, 2025 — Oarfish are greatly elongated, large fish in the family Regalecidae. This family, de…</p>

19. Source: today.ucsd.edu
Link:https://today.ucsd.edu/story/fish-experts-study-rare-deep-sea-oarfish-in-the-lab

<summary>Source snippet</summary><p>UC San Diego TodayFish Experts Study Rare Deep-Sea Oarfish in the Lab27 Aug 2024 — This deep-sea fish is incredibly rare, and marks only…</p>

20. Source: theguardian.com
Link:https://www.theguardian.com/us-news/article/2024/aug/16/oarfish-san-diego

21. Source: theguardian.com
Link:https://www.theguardian.com/environment/2025/nov/21/giant-oarfish-washes-up-on-tasmanian-beach

<summary>Source snippet</summary><p>Local resident Tony Cheesman discovered the silvery, ribbon-like fish during a walk, noting its distinctive features like long fins exten…</p>

22. Source: blog.biodiversitylibrary.org
Title: the quest for sea serpent oarfish or
Link:https://blog.biodiversitylibrary.org/2014/10/the-quest-for-sea-serpent-oarfish-or

<summary>Source snippet</summary><p>Biodiversity Heritage LibraryThe Quest for the Sea Serpent: An Oarfish or Something…Oct 29, 2014 — Fleeting glimpses of oarfish could…</p>

23. Source: tos.org
Link:https://tos.org/oceanography/assets/docs/27-2_dybas.pdf

<summary>Source snippet</summary><p>The Oceanography SocietyOceanography“Even the famous Sea Serpent, measuring fifty-six feet in length, cast up on the shore of Orkney in 1…</p>

24. Source: smithsonianmag.com
Title: the giant squid dragon of the deep 18784038
Link:https://www.smithsonianmag.com/science-nature/the-giant-squid-dragon-of-the-deep-18784038/

<summary>Source snippet</summary><p>Smithsonian MagazineThe Giant Squid: Dragon of the DeepJun 21, 2011 — After over 150 years since it was first sighted by the HMS Daedalus…</p>

25. Source: smithsonianmag.com
Title: sea serpent” sightings Natural History Museum. [2/4].Read more
Link:https://www.smithsonianmag.com/smart-news/glimpse-sea-serpents-dragons-and-other-mythical-beasts-online-exhibition-1-180976593/

<summary>Source snippet</summary><p>Smithsonian MagazineMeet the Real Animals Behind Mermaids, Dragons and…Dec 21, 2020 — Mermaids, sea serpents, manatees and giant oarfi…</p>

27. Source: smithsonianmag.com
Link:https://www.smithsonianmag.com/smart-news/rare-deep-sea-doomsday-fish-surfaces-in-california-just-the-20th-discovered-in-the-state-since-1901-180984942/

<summary>Source snippet</summary><p>Times. “It evokes the sea serpent mythology.” Oarfish have long played a role in Japanese…Read more…</p>

28. Source: australian.museum
Link:https://australian.museum/learn/animals/fishes/oarfish-regalecus-glesne/

<summary>Source snippet</summary><p>The Australian MuseumThe Oarfish is reported to be the longest of all fishes. It has a ribbon-like body that has been reliably documented…</p>

29. Source: nationalgeographic.com
Link:https://www.nationalgeographic.com/science/article/131022-giant-oarfish-facts-sea-serpents

<summary>Source snippet</summary><p>5 Surprising Facts About the Oarfish That Has Been…Oct 22, 2013 — Giant oarfish are the longest known living species of bony fish, rea…</p>

30. Source: aquarium.ucsd.edu
Title: fish experts study rare deep sea oarfish lab
Link:https://aquarium.ucsd.edu/newsroom/fish-experts-study-rare-deep-sea-oarfish-lab

<summary>Source snippet</summary><p>Experts Study Rare Deep-Sea Oarfish in the LabAug 22, 2024 — The fish was an adult male, measuring 12.25 feet (3.735 meters) in length, 1…</p>

Additional References

31. Source: axios.com
Link:https://www.axios.com/local/san-diego/2024/08/14/rare-doomsday-fish-la-jolla-oarfish

<summary>Source snippet</summary><p>Measuring 12 feet, this sea serpent-like creature is known for its exceptional length—growing up to 36 feet—and its two oar-like pelvic f…</p>

32. Source: marinebio.org
Link:https://www.marinebio.org/species/oarfishes/regalecus-glesne/

33. Source: youtube.com
Link:https://www.youtube.com/watch?v=2U2NNVX08EQ

<summary>Source snippet</summary><p>Giant Sea Serpent Appears on Cabo BeachA beach day in Cabo took an unexpected turn when two sisters spotted something strange flashing in…</p>

34. Source: youtube.com
Link:https://www.youtube.com/%40SEA

35. Source: abc11.com
Title: They are likely responsible for sea serpent legends throughout history.Read more
Link:https://abc11.com/post/oarfish-creature-sea-animal-fish/13524337/

<summary>Source snippet</summary><p>Divers discover giant oarfish off coast of Taiwan, seen as…Jul 20, 2023 — Oarfish don't live near the ocean floor where deep-sea seismic…</p>

36. Source: instagram.com
Link:https://www.instagram.com/p/DVjTN3LlBfW/

<summary>Source snippet</summary><p>nese Ryūgū (龍宮), a 10-meter deep-sea “sea serpent,” lives in…Read more…</p>

37. Source: newsukraine.rbc.ua
Title: On average, these fish reach a length of about 5.5 meters.Read more
Link:https://newsukraine.rbc.ua/news/monster-from-the-deep-should-we-fear-sea-1700305575.html

<summary>Source snippet</summary><p>rbc.uaWorld's longest fish giant oarfish - Should we fear sea…Nov 18, 2023 — The giant oarfish was entered into the Guinness World Rec…</p>

38. Source: instagram.com
Link:https://www.instagram.com/reel/DW6kYEpFaNh/?hl=en

<summary>Source snippet</summary><p>ashed ashore, sparking curiosity and panic across social media…</p>

39. Source: facebook.com
Link:https://www.facebook.com/smithsonianmagazine/posts/while-on-a-snorkel-tour-on-the-great-barrier-reef-marine-biologist-jorja-gilmore/1114540227204833/

<summary>Source snippet</summary><p>While on a snorkel tour on the Great Barrier Reef, marine…Their bright red fins and silvery bodies have inspired sea serpent myths for…</p>

40. Source: queins.in
Title: oarfish the legendary sea serpent
Link:https://www.queins.in/blogs/fish/oarfish-the-legendary-sea-serpent?srsltid=AfmBOoqJQt0Q5IPfH_Z9Z0O1BaAXvczXQTFzLjER2SVUL3rnn_AVIQX5

<summary>Source snippet</summary><p>Oarfish – The Legendary “Sea Serpent” with Real Nutritional…Sep 24, 2025 — In ancient Japan, China, and Mediterranean cultures, oarfis…</p>

Topic Tree

Follow this branch

Parent topic

Sea Serpents Why Sea Serpent Stories Keep Returning

Related pages 5