There is no single typical size for all deep-sea anglerfish: their sizes vary by species, and females are often much larger than males. For example, female Murray’s abyssal anglerfish are reported at 12 cm, while a female Krøyer’s deep-sea anglerfish has a reported common length of 77 cm and a reported maximum of 120 cm total length.
Deep-sea anglerfish vary in size by species
“Deep-sea anglerfish” refers to a diverse group, not one species with a single average size. The figures below are source-reported species values, not a group-wide average.
| Species or group | Reported size | How to interpret it |
|---|---|---|
| Murray’s abyssal anglerfish | Female 12 cm; male 2 cm | Species-specific examples reported by the Australian Museum |
| Humpback blackdevil | Female 18 cm; male 2.9 cm | Species-specific examples reported by the Australian Museum |
| Krøyer’s deep-sea anglerfish (Ceratias holboelli) | Female common length 77 cm; reported maximum 120 cm total length | The maximum is an exceptional species-level record, not a typical size for the group |
| Females in the genus Gigantactis | Up to 40 cm | A genus-level upper figure, not a group-wide typical size |
| Warty seadevils | Females around 1 m; males a few centimetres | An approximate Natural History Museum description for this group |
How large is the largest deep-sea anglerfish?
The Australian Museum’s Fishes of Australia entry reports a maximum total length of 120 cm for a female Krøyer’s deep-sea anglerfish. It also lists 77 cm as the female’s common length. Treat 120 cm as a reported species-level maximum, not as the size of a typical deep-sea anglerfish or a size reached by most females.
Other species are much smaller. The Australian Museum reports female Murray’s abyssal anglerfish at 12 cm and female humpback blackdevils at 18 cm. These examples show why a single figure cannot describe the whole group.
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Why are female anglerfish often larger than males?
In many deep-sea anglerfish, females are substantially larger than males. The Australian Museum reports female and male sizes of 12 cm and 2 cm for Murray’s abyssal anglerfish, and 18 cm and 2.9 cm for humpback blackdevils.
Natural History Museum Senior Curator of Fish James Maclaine explains: “Females need to be a certain size to make and carry the eggs and so need more food.” This is a common pattern among deep-sea anglerfishes, not a rule to apply to every fish called an anglerfish.
Why measurement conventions matter
Not every fish-size figure uses the same measurement. The 120 cm maximum for female Ceratias holboelli is reported as total length. An Australian Museum account also describes a 31 cm female Gigantactis elsmani specimen using standard length; that is a specimen record, not the species’ maximum.
When comparing figures, check whether the source gives total length, standard length, a common reported length, or a maximum. These terms describe different kinds of measurements or records and should not be treated as interchangeable.
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How big is a typical deep-sea anglerfish?
There is no defensible group-wide average in the cited research. Size depends on species: for example, female Murray’s abyssal anglerfish are reported at 12 cm, while female Krøyer’s deep-sea anglerfish have a reported common length of 77 cm.
What is the largest reported deep-sea anglerfish?
The Australian Museum reports a maximum total length of 120 cm for a female Krøyer’s deep-sea anglerfish, Ceratias holboelli. This is a reported species-level maximum, not a typical size for the group.
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Are male deep-sea anglerfish smaller than females?
Females are much larger than males in many deep-sea anglerfish. The Australian Museum, for example, reports 12 cm females and 2 cm males for Murray’s abyssal anglerfish, and 18 cm females and 2.9 cm males for humpback blackdevils.
Why are female anglerfish larger?
Natural History Museum Senior Curator of Fish James Maclaine says females need enough size to make and carry eggs, and therefore need more food.
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