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July 27, 2026Sources cited
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Anglerfish

Anglerfish are a group of ray-finned fish in the order Lophiiformes, known for a modified dorsal-fin spine used as a lure to attract prey.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 27, 2026|2 min read| Fact-checked

Anglerfish are a group of ray-finned fish in the order Lophiiformes, known for a modified dorsal-fin spine used as a lure to attract prey. They include many species found in deep water, though some live in shallower marine habitats. The group is noted for diverse body forms, carnivorous diets, and unusual reproductive strategies in some deep-sea species.

Classification

Anglerfish belong to the order Lophiiformes and include multiple families and species. They are ray-finned fishes with a wide range of body forms and habitats.

Physical characteristics

Many anglerfish have large heads, expandable mouths, and a distinctive lure near the mouth. In several deep-sea species, the lure is bioluminescent and used to attract prey.

Habitat and distribution

Anglerfish are found in oceans worldwide. Some species live near the seafloor in deep water, while others inhabit reefs, continental shelves, or shallow tropical waters.

Diet and feeding

Anglerfish are predators that eat fish, crustaceans, cephalopods, and other small marine organisms. They often ambush prey rather than pursue it actively.

Reproduction

Some deep-sea anglerfish have unusual reproductive biology, including very small males in certain species. In some cases, males attach to females for reproduction.

Key facts

  • Anglerfish are a diverse order of fish rather than a single species.
  • Their most distinctive trait is a lure formed from a modified dorsal-fin spine.
  • Many species live in deep-sea habitats, but some occur in shallower waters.
  • They are carnivorous and feed on fish and other marine animals.
  • Some deep-sea species show extreme sexual dimorphism, with much smaller males than females.
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Canadian context

Anglerfish are relevant to Canadian readers through marine biology, ocean science, and North Atlantic and Arctic-adjacent research and fisheries contexts, especially for deep-sea species and related fish such as monkfish.

Frequently asked questions

What is an anglerfish?
An anglerfish is a marine fish in the order Lophiiformes, known for a lure-like dorsal spine used to attract prey.
Are anglerfish a single species?
No. Anglerfish are a group of more than 200 species across multiple families.
Where do anglerfish live?
They live in marine environments worldwide, from shallow waters to deep-sea habitats.
What do anglerfish eat?
They are carnivores that eat fish, crustaceans, cephalopods, and other small marine animals.
Why are anglerfish famous?
They are famous for the bioluminescent lure used by many species to attract prey.
Do male and female anglerfish look the same?
Often no. In some deep-sea species, females are much larger than males, and the sexes can differ greatly in form.

References

  1. National Geographichttps://www.nationalgeographic.com/animals/fish/facts/anglerfish
    Supports: General description, habitat, diet, number of species, and lure-based predation
  2. Smithsonian Oceanhttps://ocean.si.edu/ocean-life/fish/anglerfish-lure-prey-throughout-ocean
    Supports: Classification within Lophiiformes and distribution across shallow and deep marine habitats
  3. ScienceDirect Topicshttps://www.sciencedirect.com/topics/agricultural-and-biological-sciences/anglerfish
    Supports: Species diversity, habitats, and predatory feeding
  4. NAMEPAhttps://namepa-website-media.s3.amazonaws.com/wp-content/uploads/2023/09/21134139/Anglerfish-Fact-Sheet-2.pdf
    Supports: Over 200 known species, deep-sea habitat, benthic habits, size, and lifespan
  5. Wikipediahttps://en.wikipedia.org/wiki/Anglerfish
    Supports: Order Lophiiformes and lure derived from modified dorsal fin ray