Acropora echinata

Acropora echinata is a stony coral in the family Acroporidae, distinguished by its finely branching, corymbose to arborescent growth form, with short, tapering branchlets radiating outward. Like other Acropora species, it is a colonial organism built from thousands of tiny polyps that secrete calcium carbonate skeletons, gradually constructing the complex three-dimensional reef structures that shelter fish, invertebrates, and other marine life. It relies on symbiotic zooxanthellae algae for the bulk of its energy, obtained through photosynthesis, supplemented by capturing plankton with its tentacles at night.

As a fast-growing branching species, it contributes significantly to reef framework building and habitat complexity.

The species occurs across parts of the Indo-Pacific, including Australia, Japan, China, India, Palau, and Kiribati, inhabiting shallow marine neritic zones and coastal reef environments, generally in clear, current-swept waters typical of reef slopes and lagoons.

Its population is declining due to a wide array of pressures: coral mining and quarrying, destructive fishing and harvesting practices, recreational activities such as diving and anchoring, disease outbreaks and invasive species, coral predators, and pollution from urban wastewater and agricultural runoff. Habitat alteration, storms, flooding, and fire-related land-use changes compound these stresses, while rising sea temperatures increase susceptibility to bleaching.

Conservation efforts include its listing under CITES Appendix II, inclusion in marine protected areas across parts of its range, and reef monitoring and restoration programs in several countries. Water quality management and fishing regulations are being applied in some jurisdictions.

Given the breadth and persistence of ongoing threats, the species' trajectory remains one of continued decline, consistent with its Endangered status.