Depth zone0–200 m

Sunlight Zone

Epipelagic zone

The ocean's topmost layer, where enough sunlight reaches for photosynthesis. It holds most of the sea's plant-like life and the majority of familiar marine animals.

Conditions in this zone

Depth: roughly 0–200 metres
Sunlight: abundant — enough for photosynthesis
Temperature: the warmest ocean layer, varying with latitude and season
The most productive and biodiverse part of the open ocean

Life of the sunlight zone

Most animals people picture in the sea live here, from reef fish and rays to dolphins, sea turtles, and the great whales that feed in productive surface waters.

Animal profiles in this zone

Marine animals FaunaHub profiles that are documented in this zone. Many also occur in other layers.

Blue-Ringed Octopus
Small octopuses of shallow Indo-Pacific waters, tide pools, and reefs; their warning blue rings flash when alarmed.
Verified range
Source: WoRMS, Britannica, Animal Diversity Web
Clownfish
Reef fish of shallow, sunlit tropical waters.
Verified range
Source: Animal Diversity Web, Encyclopaedia Britannica
Dolphin
Air-breathing mammals of sunlit surface waters.
Verified range
Source: Animal Diversity Web, Encyclopaedia Britannica, IUCN Red List of Threatened Species
Giant Clam
The largest living bivalves, embedded in shallow, sunlit coral reefs where symbiotic algae in the mantle photosynthesise.
Verified range
Source: WoRMS, Britannica, NOAA Fisheries
Penguin
Penguins pursue prey in the sunlit surface layer.
Verified range
Source: Animal Diversity Web, Britannica, IUCN Red List of Threatened Species
Sea Turtle
Sea turtles surface to breathe and forage in shallow, sunlit waters.
Verified range
Source: Animal Diversity Web, NOAA Fisheries, IUCN Red List of Threatened Species
Seahorse
Seahorses live in shallow seagrass and reef habitats.
Verified range
Source: Animal Diversity Web, NOAA Fisheries, IUCN Red List of Threatened Species
Tuna
Fast open-ocean predators of the sunlit zone.
Verified range
Source: Animal Diversity Web, NOAA Fisheries, IUCN Red List of Threatened Species
Whale
Baleen whales such as the humpback feed in productive surface waters.
Verified range
Source: Animal Diversity Web, Britannica, IUCN Red List of Threatened Species
Abalone
Large grazing sea snails that cling to rocks and reefs in sunlit, algae-rich coastal waters, especially kelp.
Broad / widespread
Source: WoRMS, Britannica, IUCN Red List of Threatened Species
Chiton
Eight-plated molluscs (Polyplacophora) that grip rocks on sunlit, wave-washed shores and shallow seas.
Broad / widespread
Source: WoRMS, Britannica, Animal Diversity Web
Cone Snail
Predatory sea snails of warm, shallow reefs and sandy bottoms; some species have venom that is medically significant to people.
Broad / widespread
Source: WoRMS, Britannica, Animal Diversity Web
Cowrie
Glossy-shelled sea snails of warm, shallow reefs and rocky shores, where the mantle polishes the shell.
Broad / widespread
Source: WoRMS, Britannica, Animal Diversity Web
Crab
Many crabs live in shallow coastal and intertidal habitats.
Broad / widespread
Source: Animal Diversity Web, NOAA Fisheries, Encyclopaedia Britannica
Eel
Moray and other eels are common on shallow reefs.
Broad / widespread
Source: Animal Diversity Web, NOAA Fisheries, Encyclopaedia Britannica
Jellyfish
Jellyfish drift through surface waters, and some occur down in the twilight zone.
Broad / widespread
Source: Animal Diversity Web, NOAA Fisheries, Encyclopaedia Britannica
Limpet
Cone-shelled gastropods that cling tightly to rocks on sunlit, wave-battered shores and graze algae.
Broad / widespread
Source: WoRMS, Britannica, Animal Diversity Web
Lobster
Many lobsters live on relatively shallow seabeds.
Broad / widespread
Source: Animal Diversity Web, NOAA Fisheries, Encyclopaedia Britannica
Octopus
Many octopuses live on shallow reefs and coastal seabeds.
Broad / widespread
Source: Animal Diversity Web, Britannica, IUCN Red List of Threatened Species
Pufferfish
Many pufferfish live in warm, shallow coastal waters.
Broad / widespread
Source: Animal Diversity Web, NOAA Fisheries, Encyclopaedia Britannica
Ray
Many rays live on shallow seabeds and in coastal waters.
Broad / widespread
Source: Animal Diversity Web, NOAA Fisheries, Encyclopaedia Britannica
Scallop
Filter-feeding bivalves of sandy and gravelly seabeds; many can swim by clapping their valves to escape predators.
Broad / widespread
Source: WoRMS, Britannica, NOAA Fisheries
Sea Slug
An informal group of shell-less marine gastropods — sea hares, nudibranchs, and kin — of shallow seabeds, reefs, and seaweed.
Broad / widespread
Source: WoRMS, Britannica, Animal Diversity Web
Seal
Seals forage in coastal and surface waters, diving for prey.
Broad / widespread
Source: Animal Diversity Web, Britannica, IUCN Red List of Threatened Species
Shark
Many sharks hunt in sunlit surface waters; some descend into the twilight zone on deep dives.
Broad / widespread
Source: Animal Diversity Web, Britannica, IUCN Red List of Threatened Species
Squid
Squid range from surface waters down into the twilight zone.
Broad / widespread
Source: Animal Diversity Web, NOAA Fisheries, Encyclopaedia Britannica
Starfish
Sea stars are common from the shore into shallow seas.
Broad / widespread
Source: Animal Diversity Web, NOAA Fisheries, Encyclopaedia Britannica
Whelk
Predatory and scavenging sea snails of sandy, muddy, and rocky seabeds in cool and temperate coastal seas.
Broad / widespread
Source: WoRMS, Britannica, NOAA Fisheries

Source & methodology

Zone science here is summarised from authoritative ocean-science sources. Animal placements reuse each species' verified source and show a confidence label; a depth zone is not treated as a complete range, since many animals move between layers.

Frequently Asked Questions

How deep is the sunlight zone?

The sunlight zone (epipelagic zone) spans roughly 0–200 m.

Do these animals live only in the sunlight zone?

Not necessarily. Many marine animals move between depth zones, some migrating vertically each day. We show the zone(s) each animal is documented to occur in, with a confidence label.

Last updated: 2026-06-27