Brauer's cyclothone is a small deep-sea fish up to seven centimeters long. It lives in complete darkness at great depths, glows with special organs, and is considered one of the most common vertebrates on Earth.
Brauer's cyclothone stands out with curved teeth and a large number of light organs. It occupies an important place in the ocean's food chain, converting small plankton into food for larger fish and squids.
Immature form that undergoes metamorphosis before adulthood.
Worker
birth time
Pelagic Ocean
Dogs, dolphins, lynx hang out for 9-25 years and party on their birthday three times a year
m
Map
will celebrate their {n} birthday
g
t
When your next jubilee falls in {name} life years
Human
days
marine pelagic
How old you would be if you lived as {name}
suction
Theoretical maximum lifespan estimated from the Dynamic Energy Budget (DEB) mathematical model. This value reflects a biological potential derived from metabolic parameters, not from direct observation — real recorded lifespans are often significantly shorter.
Captures food by straining water or substrate through specialized structures.
adult
Maturity
marine benthic
About health
marine demersal
When your next birthday would fall if you lived as {name}
results
Colors
Sex
Upcoming jubilees
Gremllins
mo
all seas and oceans
Trophic type
Filters
Upcoming birthdays
Truly long lives: 40-100 years. Bowhead whales, albatrosses, giant tortoises recall their birthday at most once a year
Lifespan
Age (from birth to death)
most of Europe and Asia, various forests, steppes and tundra
Wanderers
copepods
far from shore, deep water, large whales and sharks live here
Jubilee = every 10th birthday
Draws prey or water into the mouth by creating negative pressure.
Earliest developmental stage inside an egg or womb.
Business sausages
Lifespan average
water is almost always cold, there may be ice in winter, not hot in summer
Rapidly swallows prey or food items whole without chewing.
What do they look like?
Maturity
emergence (insects)
end of lifespan
How do they live?
fertilization / egg laying
How do they behave?
birth / hatching
metamorphosis / end of larval stage
end of acceleration
Share
Find a pet...
Mature, fully developed individual capable of reproduction.
Cold sea
gulping
Actively hunting and capturing live prey.
Pets
Primary oral structure used to seize, manipulate, or ingest food.
whole swallow
{name} jubilee
Photophores count
Eyes size
cm
zooplankton feeding, animal plankton — small crustaceans and larvae
Old-timers
Find an animal or breed...
mouth
turns
Rascals
Abyssal Ocean
Litter size
Map data sources: Ecosystem classification — IUCN Global Ecosystem Typology (Keith et al., 2022), indicative distribution maps Keith et al. (2020), https://doi.org/10.5281/zenodo.3546513; Large Marine Ecosystems — NOAA LME Program; Bathymetry — GEBCO Bathymetric Compilation Group (2026), GEBCO_2026 Grid, https://doi.org/10.5285/4f68d5c7-45eb-f999-e063-7086abc036fa; Climate data — Generated using Copernicus Climate Change Service information; Species occurrence data — GBIF.org, Derived dataset "all animals", https://zveriki.com/dataset/dataset.tsv; Terrestrial ecoregions — RESOLVE Ecoregions 2017 (Dinerstein et al., 2017), CC BY 4.0
How to care for them?
Living from 25 to 40 years. Orangutans, bald eagles, African elephants celebrate their birthday twice a year
°C
Not specified
Egg color
pelagic zone — open water far from shore and seabed
Where are they found?
all seas and oceans
Species lacks any fixed or lasting shelter structure.
Locomotion through water employed while searching for or capturing prey.
Legendary longevity: over 100 years. Galapagos tortoises, Greenland sharks, ocean quahogs celebrate with family once every 4 years
Photophores color
Offspring
Elders
Bro
Taxons
carnivore
if born as {name}
age
birth date
Palearctic realm
swimming
no permanent shelter
Close
water column
plankton
was
Career from 7 to 15 months. Dwarf hamsters, voles, field crickets celebrate their birthday twice a month
Marine world
The basics
My weight?
Non-stop carnival: they only live a few days. Mayflies, rotifers, midges celebrate their birthday more than twice a day
3 to 8 grams, 0.5 – 5 centimeters
primary food sources
Potential Habitat
suction
d
In husbandry
Feeds while suspended in open water between surface and bottom.
On the go from 1.3 to 3.5 years. Forest mice, anoles, rainbow fish party on their birthday once a month
Feeding occurs in water bodies such as rivers, lakes, or oceans.
Mass
Mosquitoes, fruit flies, small crustaceans hustle for up to 7 months and throw a birthday party every week
Body size
aquatic
{name} birthday
No results found
very deep, dark and cold, strange fish live here
Eyes color
On the map
lunge
small crustaceans
all life stages
Female ♀
Body color
Map data sources: Ecosystem classification — IUCN Global Ecosystem Typology (Keith et al., 2022), indicative distribution maps Keith et al. (2020), https://doi.org/10.5281/zenodo.3546513; Large Marine Ecosystems — NOAA LME Program; Bathymetry — GEBCO Bathymetric Compilation Group (2026), GEBCO_2026 Grid, https://doi.org/10.5285/4f68d5c7-45eb-f999-e063-7086abc036fa; Climate data — Generated using Copernicus Climate Change Service information; Species occurrence data — GBIF.org, Derived dataset "all animals", https://zveriki.com/dataset/dataset.tsv; Terrestrial ecoregions — RESOLVE Ecoregions 2017 (Dinerstein et al., 2017), CC BY 4.0
Potential habitat modelled from GBIF occurrence data. Map © Zveriki.com, licensed under CC BY 4.0.
birth year
Maturity
sq mm
yr
benthic zone — the bottom of the open sea
How similar?
Egg size
Male ♂
until the celebration
age as {name}
How do they breed?
On the go from 3.5 to 6 years. Hedgehogs, crows, lizards treat themselves to birthday snacks 6 times a year
What if eaten?
Neither
Mouthpart modified to create suction for ingesting food or anchoring.
zoo-plankton
What do they eat?
Where do they live?
Marine world
cyclops and other small copepod crustaceans
early young
Duration
filter feeding
saline marine habitat
This is me
Gamers
Teeth count
How are they built?
marine
mm
Theoretical lifespan
ml
Stars
Link copied
My age?
wk
My size?
Asexual
swap
active predation
Rabbits, falcons, red-eared turtles hang out for 6-9 years and party on their birthday four times a year
Where do they take shelter?
celebrated their {n} birthday
When you would have been born if you lived as {name}
Daddies
small crabs, amphipods and other crustaceans
Lifespan maximum
Berry
Hermaphrodite ⚥
embryo
Length
kg
Rapid forward strike to seize prey.
near-bottom water layer of the open sea
Observations
◉{N} more on tap