
Boulder Brain Coral
Colpophyllia natans
Porites porites

Finger coral forms patches of short, finger-like branches spreading across the reef. It is common and tough, able to grow in many different reef settings.
Its fingers are wider than those of related Porites corals, so a lookalike branching coral with narrower, thinner fingers is a different species.
This coral grows as clusters of short, blunt-tipped fingers, sometimes packed close together and sometimes spaced apart. The fingers can curve or hook and point in every direction. Colour is usually white or a pale blue-grey.
Finger coral grows in shallow tropical seas, down to about 50 m, on both the front and back parts of reefs where the water stays fairly clear. It also grows on mangrove roots and among seagrass beds.
Finger coral gets food from algae living in its tissue, which use the coral's waste and sunlight to produce oxygen and nutrients. Unlike most stony corals, its polyps often stretch out their tentacles to feed during the day, not just at night.
Describe what you saw and we name it, then keep every species you find in your Oceandex.