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Marine Life on Koh Tao

Koh Tao's reefs support an extraordinary range of species — from whale sharks and turtles to nudibranchs smaller than your thumbnail. This guide covers the animals you're most likely to encounter on a dive or snorkel trip with us.

Want to see these species in person?

We run fun dives, snorkeling trips, and training dives daily. Small groups, experienced guides, and some of the best reefs in the Gulf of Thailand.
    • Shark
    • Carcharhinus melanopterusScientific Name
    • VulnerableIUCN Threatened Status
    • Fish
    • Ostracion cubicusScientific Name
    • Least ConcernIUCN Threatened Status
    • Fish
    • Pterocaesio chrysozonaScientific Name
    • Least ConcernIUCN Threatened Status
    • Fish
    • Gymnothorax thyrsoideusScientific Name
    • Least ConcernIUCN Threatened Status
    • Turtle
    • Eretmochelys imbricataScientific Name
    • Critically EndangeredIUCN Threatened Status
    • Other
    • Heteractis magnificaScientific Name
    • Least ConcernIUCN Threatened Status
    • Coral
    • Plerogyra sinuosaScientific Name
    • Least ConcernIUCN Threatened Status
    • Nudibranch
    • Jorunna funebrisScientific Name
    • Least ConcernIUCN Threatened Status
    • Coral
    • Acropora spp.Scientific Name
    • Near ThreatenedIUCN Threatened Status
    • Ray
    • Taeniura lymmaScientific Name
    • Near ThreatenedIUCN Threatened Status
    • Fish
    • Balistoides viridescensScientific Name
    • Least ConcernIUCN Threatened Status
    • Shark
    • Rhincodon typusScientific Name
    • EndangeredIUCN Threatened Status
    • Turtle
    Close-up of green sea turtle head — small non-retractable head with blunt rounded beak – as it feeds on a jellyfish in the water of Koh Tao, Thailand.
    • Chelonia mydasScientific Name
    • EndangeredIUCN Threatened Status