Fauna
Species

Longnose Lancetfish

Alepisaurus ferox

Also known as Cannibal Fish, Long-snouted Lancetfish

Gliding through cold oceanic depths down to nearly 2,000 meters, this ambush predator strikes with massive dagger-like fangs and a towering sailfin. Its scaleless, silvery body possesses watery flesh suited for sudden vertical lunges rather than sustained cruising. Equipped with an exceptionally slow digestive process, lancetfish frequently hold virtually intact prey in their bellies, making them living biological samplers of the deep sea for researchers.

Deep SeaPelagicCarnivore
Longnose Lancetfish reference1 / 2
(c) Saryu Mae 前 朝琉, some rights reserved (CC BY) · cc-by
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Least ConcernConservation statusIUCN Red List categoriesLCNTVUENCREWEXLeast ConcernRed List categories, explained →
Key facts
Diet & preySquid, Lanternfish, Pelagic Crabs
Predators
  • Swordfish
  • Yellowfin Tuna
  • Blue Shark
ThreatsCommercial longline bycatch and plastic ingestion
HabitatsEpipelagic to bathypelagic open oceans worldwide
Life span5–10 years
Classification
  1. FamilyAlepisauridae
  2. SpeciesAlepisaurus ferox
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Teeth are extremely sharp and cause deep lacerations; avoid handling jaws of landed specimens.
Why it is dangerous
Large palatine fangs and razor-like teeth can easily slice human skin and sever tendons even in dead or dying individuals.
How to recognize a risky encounter
Look for a slender silvery body, huge dark eyes, a tall sail-like dorsal fin, and mouth full of upright fangs.
What to do
Never touch or manipulate the mouth directly; use long-handled release tools or heavy protective gear.
Responsible observation
  • Beached Specimens: Photograph and report strandings to marine researchers, as stomach contents yield valuable ecological data.
  • Bycatch Caution: Keep hands well clear of the tooth-lined jaws when unhooking fish caught on offshore fishing tackle.
Related species
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