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Staghorn Coral

Staghorn coral is one of the most important reef-building corals found around Koh Tao. Its branching structure provides shelter and habitat for countless reef fish and marine invertebrates.

Near Threatened
Staghorn Coral: Staghorn coral is one of the most important reef-building corals found around Koh Tao. Its branching structure provides shelter and habitat for countless reef fish and marine invertebrates.
Scientific Name
Acropora spp.
Typical size
Colonies up to several meters
difficulty to see
Common
Best Time to See
Year Round

Overview

Staghorn corals are among the most recognizable hard corals found on tropical reefs throughout the Indo-Pacific. Their branching structures resemble the antlers of a deer, giving them their common name.

These corals play a vital role in reef ecosystems by creating complex underwater habitats that support fish, crustaceans, and countless other marine species. Around Koh Tao, healthy staghorn coral colonies can be found at many shallow reef sites where they contribute to the island’s vibrant underwater landscapes.

Although corals may appear to be plants or rocks, they are actually colonies of tiny animals called polyps. These polyps work together to build the calcium carbonate skeleton that forms the foundation of coral reefs.

Staghorn corals face increasing threats from climate change, coral bleaching, pollution, and physical damage. Protecting coral reefs is essential for maintaining healthy marine ecosystems and supporting the incredible biodiversity that attracts divers and snorkelers to Koh Tao.

Conservation Status
Near Threatened
Danger Level
Harmless
Typical Depth 
3-18m
Behavior
Spawning, Filter Feeding

Snorkel with staghorn corals

We regularly encounter this species on our dives and guided snorkel trips around Koh Tao.
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Identification

Staghorn Coral grows in dense thickets of cylindrical, tapering branches that radiate outward from a central base, closely resembling the antlers of a stag.
Branches are uniform in diameter along their length and typically finger-thick, ranging from a few centimetres to over a metre long in established colonies. The overall colony form is one of the most immediately recognisable shapes on the reef.
Staghorn Coral forms some of the largest coral structures on Koh Tao's shallower reefs, with mature thickets reaching several metres across and providing critical habitat for juvenile fish, invertebrates, and small reef species that shelter between the branches.

Conservation Notes

Never touch, stand on, or kneel near coral. A single fin kick can break branches that took years to grow. Maintain good buoyancy control before diving shallow reef areas where staghorn colonies are dense. If you see white or pale colonies, report the location to your dive instructor — bleaching events are tracked by local conservation groups on Koh Tao.

Staghorn Coral Facts

Staghorn coral can grow several centimeters per year, making it one of the fastest-growing reef-building corals.
Corals are animals, not plants.
A single coral colony may contain thousands of individual polyps.

Where to find them

Staghorn thickets are worth slowing down for. The fish life inside a healthy colony is dense — look for small wrasse, damselfish, and juvenile fish sheltering between the branches. Japanese Gardens has some of the healthiest shallow staghorn formations around Koh Tao, particularly on the northern end of the site at around 4–8 metres.

White Rock

Reef • 5–26 m

Tanote Bay

Reef • 2–20 m

Japanese Gardens

Reef • 5–18 m

Twins

Pinnacle • 6–25 m

Frequently Asked Questions

A: The coral itself won’t sting you, but the calcium carbonate skeleton is sharp enough to cut skin, and touching it damages the living tissue. Even a light brush removes the protective mucus layer that helps coral defend against infection. The rule is simple — look, don’t touch.

A: Healthy staghorn coral is brown, golden, or occasionally greenish, with pale or white growth tips. The colour comes from the zooxanthellae algae living in the tissue. If an entire colony is white rather than just the branch tips, it may be bleaching — a stress response to warm water.

A: Staghorn coral is a reef builder. The physical structure it creates supports hundreds of other species. Remove the coral and you remove the habitat — fish populations decline, invertebrates lose shelter, and the reef loses its complexity. Healthy staghorn colonies are one of the best indicators of overall reef health.

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