The onion-eyed grenadier, or Berglax macrourus, is a deep-sea fish with very large eyes and a long body that tapers sharply towards the tail. It lives in the cold waters of the North Atlantic at great depths.
The onion-eyed grenadier differs from other grenadiers with its particularly large eyes and head shape. It plays an important role in the deep-sea food chain, eating small animals and becoming prey for larger fish.
Immature form that undergoes metamorphosis before adulthood.
tail
Worker
birth time
Pelagic Ocean
bottom
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
live octopuses, squids
How old you would be if you lived as {name}
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.
eyes
adult
Maturity
cephalopods
fish of small size
crabs
live marine and freshwater shrimps
Melon
About health
When your next birthday would fall if you lived as {name}
Repro interval
results
Polar sea
Eyes count
Colors
Sex
Upcoming jubilees
Gremllins
mo
all seas and oceans
Trophic type
Filters
small fish
Palearctic realm
Upcoming birthdays
Truly long lives: 40-100 years. Bowhead whales, albatrosses, giant tortoises recall their birthday at most once a year
Lifespan
Age (juvenile)
Age (from birth to death)
Foraging occurs on the floor of aquatic or terrestrial habitats.
Age (embryo)
most of Europe and Asia, various forests, steppes and tundra
Wanderers
far from shore, deep water, large whales and sharks live here
Jubilee = every 10th birthday
Earliest developmental stage inside an egg or womb.
Business sausages
the twilight zone of the sea, 200–1000 meters depth
Lifespan average
water is almost always cold, there may be ice in winter, not hot in summer
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
the upper illuminated layer of the sea, 0–200 meters
Share
Find a pet...
Mature, fully developed individual capable of reproduction.
Cold sea
Actively hunting and capturing live prey.
Pets
Primary oral structure used to seize, manipulate, or ingest food.
Nearctic realm
lateral line
{name} jubilee
Eyes size
cm
zooplankton feeding, animal plankton — small crustaceans and larvae
Old-timers
Find an animal or breed...
mouth
turns
Rascals
after fast growth and adult
Litter size
live crabs, shrimps, lobsters
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
Actively searching habitats to locate food items.
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.
from 0.8 to 1.2 kilograms, 0.6 – 1.2 meters
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
Offspring
Elders
Bro
Taxons
carnivore
if born as {name}
age
birth date
Head size
swimming
no permanent shelter
Palearctic realm
Close
was
Career from 7 to 15 months. Dwarf hamsters, voles, field crickets celebrate their birthday twice a month
Marine world
marine epipelagic
The basics
My weight?
marine mesopelagic
Non-stop carnival: they only live a few days. Mayflies, rotifers, midges celebrate their birthday more than twice a day
primary food sources
Potential Habitat
marine bathypelagic
active foraging for prey using large eyes and lateral line
d
In husbandry
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
Gestation
aquatic
vision
{name} birthday
Nearctic realm
No results found
North America and Greenland, from tundra to forests
Eyes color
On the map
lunge
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
How similar?
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
from birth to adulthood
zoo-plankton
What do they eat?
Where do they live?
Immature individual that has not yet reached reproductive maturity.
Marine world
from birth to death
early young
snout
Duration
saline marine habitat
This is me
most of Europe and Asia, various forests, steppes and tundra
Gamers
How are they built?
marine
mm
Theoretical lifespan
ml
Stars
Link copied
My age?
wk
My size?
sea almost always covered with thick ice, very cold all year round
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?
Sensory system detecting water movements to locate prey.
Head color
celebrated their {n} birthday
When you would have been born if you lived as {name}
Daddies
the dark depths of the sea, below 1000 meters
Lifespan maximum
foraging
from development to end of fast growth
Hermaphrodite ⚥
shrimp
North America and Greenland, from tundra to forests
Primarily detects and locates food using eyesight.
embryo
Length
kg
Rapid forward strike to seize prey.
Observations
◉{N} more on tap