Anglerfish

Anglerfish facts at a glance

How big is a anglerfish?

An adult anglerfish measures 60 cm long — about 35% of the height of an average adult person (1.73 m) — and weighs around 25 kg, about 36% of an average adult’s body weight (70 kg).

What is a baby anglerfish called?

Explore more animal collective nouns and baby animal names .

The glowing lure

Deep-sea anglerfish have a modified spine that extends over the mouth and ends in a fleshy, glowing tip. The light is produced by symbiotic bacteria living inside the lure, an example of bioluminescence. By wiggling this lure in the dark, the anglerfish draws curious prey close to its waiting jaws.

Built for the deep

Many anglerfish live in the cold, dark, high-pressure waters of the deep sea, where food is scarce. They have enormous mouths, expandable stomachs, and long, inward-curving teeth that let them swallow prey nearly as large as themselves. Slow metabolisms help them survive long gaps between meals.

Extreme reproduction

In several deep-sea species, males are tiny compared with the much larger females. A male finds a female using smell, bites onto her body, and in some species permanently fuses to her, sharing her bloodstream and becoming little more than an attached source of sperm. This ensures a mate is always available in the vast, empty deep.

Habitat and range

Anglerfish are found in oceans worldwide, with many of the famous lured species living far below the sunlit zone. Some relatives, such as the shallow-water monkfish, live on the seafloor and are caught for food. Because deep-sea species are so remote, most are not considered threatened.

Did you know? Anglerfish facts

• The anglerfish is a deep-sea fish named for the glowing, fishing-rod-like lure that grows from its head and attracts prey in the darkness.
• An anglerfish glows because of bioluminescent bacteria living in the lure on its head. The light attracts prey in the dark deep sea, drawing it close enough for the anglerfish to snap up.
• The lure is a built-in fishing rod. By dangling and wiggling the glowing tip, the anglerfish entices curious prey toward its mouth, then ambushes it with a quick gulp.
• In some deep-sea species, yes. The much smaller male bites onto the female and can permanently fuse to her body, sharing her blood supply and serving as a lifelong source of sperm.
• Many anglerfish live in the deep ocean, often well below 1,000 m where sunlight cannot reach, although some relatives live on the seafloor in shallower coastal waters.
• Conservation: Least Concern (most species).

Diet & feeding

Anglerfish feeds primarily as a carnivore. Deep-sea anglerfish have a modified spine that extends over the mouth and ends in a fleshy, glowing tip. The light is produced by symbiotic bacteria living inside the lure, an example of bioluminescence. By wiggling this lure in the dark, the anglerfish draws curious prey clos

Adaptations

• Deep-sea anglerfish have a modified spine that extends over the mouth and ends in a fleshy, glowing tip. The light is produced by symbiotic bacteria living inside the lure, an example of bioluminescence. By wiggling this lure in the dark, the anglerfish draws curious prey close to its waiting jaws.
• Many anglerfish live in the cold, dark, high-pressure waters of the deep sea, where food is scarce. They have enormous mouths, expandable stomachs, and long, inward-curving teeth that let them swallow prey nearly as large as themselves. Slow metabolisms help them survive long gaps between meals.

Behaviour & ecology

• Deep-sea anglerfish have a modified spine that extends over the mouth and ends in a fleshy, glowing tip. The light is produced by symbiotic bacteria living inside the lure, an example of bioluminescence. By wiggling this lure in the dark, the anglerfish draws curious prey close to its waiting jaws.
• Many anglerfish live in the cold, dark, high-pressure waters of the deep sea, where food is scarce. They have enormous mouths, expandable stomachs, and long, inward-curving teeth that let them swallow prey nearly as large as themselves. Slow metabolisms help them survive long gaps between meals.
• In several deep-sea species, males are tiny compared with the much larger females. A male finds a female using smell, bites onto her body, and in some species permanently fuses to her, sharing her bloodstream and becoming little more than an attached source of sperm. This ensures a mate is always available in the vast, empty deep.

Communication

• Lateral-line and visual cues coordinate schooling, courtship, or territorial behaviour.
• Some species produce low-frequency sounds or drumming for spawning or defence.

Habitat & range

Deep ocean, often below 1,000 m

Ecological role

Anglerfish acts as a predator that helps regulate prey populations and maintain balance in deep ocean, often below 1,000 m.

Conservation status of the Anglerfish

Sources & references

This guide is compiled and reviewed against established zoological and conservation references. Key sources for the Anglerfish:

• IUCN Red List of Threatened Species

  Conservation status (Least Concern) reflects the IUCN Red List category for Lophiiformes.

• iNaturalist — observations & photos

  Search citizen-science observations and community IDs for Lophiiformes. Useful for range checks and recent sightings — not a substitute for formal Red List status.

• GBIF — occurrence data

  Global Biodiversity Information Facility species search for Lophiiformes. Explore published occurrence records used in range research.

• IUCN Red List — Lophiiformes.

  Conservation status (Least Concern) and population trends.

• Wikipedia — Anglerfish.

  General taxonomy and overview (cross-check primary sources).

• Global Animal Guide editorial standards

  How we research, source, review, and update every guide for accuracy.