Japanese Sea Slugs 1590

From the tropical reefs of Okinawa to the temperate waters of Honshu, Japan offers some of the world's most diverse habitats for sea slugs and nudibranchs. Browse Japanese sea slug species observed at dive sites nationwide — built for underwater photographers and marine biologists studying Indo-Pacific nudibranch diversity.

Diving Regions Browse Photos Diving Guide (8 regions)

Japanese Sea Slugs

Shooting Location

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Top Diving Regions in Japan

Okinawa

Experience the rich subtropical coral reefs and diverse marine environments.

1085 species Explore

Shizuoka

Explore diverse marine ecosystems from Suruga Bay's deep waters to shallow coastal areas.

949 species Explore

Kagoshima

Experience unique marine environments shaped by volcanic activity and the main Kuroshio Current.

740 species Explore

Tokyo

Discover the rich marine ecosystems of these volcanic islands, nourished by the warm Kuroshio Current.

739 species Explore

Kanagawa

Discover Sagami Bay's diverse topography and surprisingly rich marine environments near major cities.

599 species Explore

Kumamoto

Explore 473 documented species in this region's diverse marine environments.

473 species Explore

Best Time to Dive in Japan

17701

Total Observations

5.0°C - 30.1°C

Water Temperature Range

Mar , May , Jan

Peak Season

5837

Peak Observations

Monthly Diving Activity & Water Temperature

Observations Water Temperature Higher bars indicate peak diving activity

Planning Your Dive Trip

Best for beginners: Peak Activity season (peak activity)
Water temperature: 5.0°C - 30.1°C range

Peak observations: 5837 in Peak Activity
Year-round diving: 17701 total observations recorded

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Complete Species List

Unidentia sp. 2

Unidentia sp. 2

Avaldesia spp.

Avaldesia spp.

Tenellia sp.33

Tenellia sp.33

Aegires hapsis

Aegires hapsis

Fahey & Gosliner, 2004

Aegires petalis

Aegires petalis

Fahey & Gosliner, 2004

Hypselodoris festiva

Hypselodoris festiva

(A. Adams, 1861)

Hypselodoris spp.

Hypselodoris spp.

Hypselodoris sp. 6

Hypselodoris sp. 6

Hypselodoris sp.19

Hypselodoris sp.19

Doriopsis pecten

Doriopsis pecten

(Collingwood, 1881)

Jorunna sp. 3

Jorunna sp. 3

Tenellia sp.11

Tenellia sp.11

Oxynoe sp. 3

Oxynoe sp. 3

Dermatobranchus caeruleomaculatus

Dermatobranchus caeruleomaculatus

Gosliner & Fahey, 2011

Tubulophilinopsis gardineri

Tubulophilinopsis gardineri

(Eliot, 1903)

Elysia sp. 2

Elysia sp. 2

Glaucus atlanticus

Glaucus atlanticus

Forster, 1777

Stiliger sp. 1

Stiliger sp. 1

Stiliger sp. 3

Stiliger sp. 3

Stiliger sp. 5

Stiliger sp. 5

Stiliger sp.10

Stiliger sp.10

Stiliger sp.11

Stiliger sp.11

Trapania palmula

Trapania palmula

Gosliner & Fahey, 2008

Costasiella sp. 6

Costasiella sp. 6

Armina rubida

Armina rubida

(A. A. Gould, 1852)

Ceratodoris kondoi

Ceratodoris kondoi

(Hamatani, 2001)

Sakuraeolis enosimensis

Sakuraeolis enosimensis

(Baba, 1930)

Sakuraeolis sp. 1

Sakuraeolis sp. 1

Sakuraeolis sp. 2

Sakuraeolis sp. 2

Sakuraeolis sp. 3

Sakuraeolis sp. 3

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