The only layer with enough light for photosynthesis, so nearly all ocean plants and 90% of marine life live here. This is where the sea meets the sun.
🐬Common dolphin
🐟Bluefin tuna
🐢Green sea turtle
🌿Giant kelp
🦠Phytoplankton
🦈Great white shark
200 – 1,000 m
🌆 Twilight Zone
Mesopelagic
LightDim blue
Temp~4–17°C
Pressure20–100 atm
Only faint blue light reaches here — too little for plants. Many animals migrate up at night to feed and sink back by day, the largest migration on Earth.
🐠Lanternfish
🗡️Swordfish
🦑Humboldt squid
🐟Hatchetfish
🐟Mahi-mahi
1,000 – 4,000 m
🌑 Midnight Zone
Bathypelagic
LightNone — only glow
Temp~2–4°C
Pressure100–400 atm
No sunlight ever reaches this far. The only light is bioluminescence — animals make their own glow to lure prey, find mates, or confuse predators.
🎣Anglerfish
🦑Giant squid
🐍Gulper eel
🦑Vampire squid
🐟Viperfish
4,000 – 6,000 m
⚫ Abyssal Zone
Abyssopelagic
LightNone
Temp~2°C
Pressure400–600 atm
Near-freezing, pitch black, and under crushing pressure. Food drifts down as "marine snow." Life is sparse, slow, and strange on the vast abyssal plains.
🐟Tripod fish
🐷Sea pig
🐙Dumbo octopus
🕷️Sea spider
6,000 – 11,000 m
🕳️ Hadal Zone
Hadalpelagic
LightNone
Temp1–4°C
Pressure600–1,100 atm
The deep ocean trenches — named for Hades. Pressure is over 1,000× the surface, yet life persists: snailfish hold the record, found 8,300 m down.
🐟Mariana snailfish
🦐Amphipod
🪱Giant tube worm
🦠Xenophyophore
5 ocean zones · surface to 11,000 mNOAA depth zones