Bryan McAllister’s personal reference notebook
July 30, 2026Short & citedBlog
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A quiet encyclopedia with a personal desk
Kept by Bryan McAllister — short guides, clear facts, and the Canadian angle when it matters.
Field Notes • Fish

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.

Updated July 30, 20261 min readCited sources

Anglerfish are a diverse order of ray-finned fish known for their bioluminescent lure. They inhabit marine environments from shallow waters to the deep sea.

What it is

Anglerfish belong to the order Lophiiformes and include over 200 species. They are not a single fish but a group with varied body forms, including seadevils, frogfish, and monkfish. Their most famous trait is a modified dorsal-fin spine that acts as a lure.

Key details

Many anglerfish have large heads, expandable mouths, and a bioluminescent lure to attract prey. They are carnivorous, feeding on fish, crustaceans, and cephalopods. Found worldwide, some species live near the seafloor while others inhabit reefs or shallow tropical waters.

Why it matters

Anglerfish reproduction is unusual: in some deep-sea species, males are much smaller than females and may attach permanently. For Canadian readers, the group is relevant to North Atlantic and Arctic marine research, particularly for deep-sea species like monkfish.

In short

  • Anglerfish are a group of over 200 species, not a single fish.
  • Their bioluminescent lure is a modified dorsal-fin spine.
  • They live in oceans worldwide, from shallow to deep waters.
  • Some species show extreme sexual dimorphism.
Canadian angle

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.

Quick questions

What is an anglerfish?
An anglerfish is a marine fish in the order Lophiiformes, known for its lure-like dorsal spine used to attract prey.
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.

Sources

  1. National Geographic — https://www.nationalgeographic.com/animals/fish/facts/anglerfish
    Supports: General description, habitat, diet, number of species, and lure-based predation
  2. Smithsonian Ocean — https://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 Topics — https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/anglerfish
    Supports: Species diversity, habitats, and predatory feeding
  4. NAMEPA — https://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. Wikipedia — https://en.wikipedia.org/wiki/Anglerfish
    Supports: Order Lophiiformes and lure derived from modified dorsal fin ray