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Overview

Acropora robusta is a distinct, thick-branching stony coral found throughout the Indo-Pacific region. It is well-adapted to high-energy environments, typically thriving in shallow reef areas exposed to strong wave action.

Distribution & habitat

This species is widely distributed across the tropical Indo-Pacific, ranging from the Red Sea and the Indian Ocean to the central Pacific. It is most commonly found in shallow, high-energy reef environments, particularly along reef margins and crests where it can withstand significant water movement.

Appearance

Colonies of A. robusta exhibit an irregular, robust growth form characterized by an encrusting base. The central portion of the colony features thick, conical branches, while the periphery displays thinner, prostrate branches with upturned ends. A key identifier is the presence of rasp-like radial corallites of varying sizes. The coloration is typically vibrant, often appearing as bright green with deep pink branch tips, though it may also be found in shades of pinkish-brown, yellow-brown, or cream.

Biology & behavior

Like other members of its genus, A. robusta relies on a symbiotic relationship with zooxanthellae, which provide energy through photosynthesis. It is a fast-growing coral that thrives in conditions with intense light and strong, random water flow. Due to its preference for high-energy zones, it is structurally resilient, though like many corals, it is susceptible to bleaching if water temperatures become excessively high.