Substrate Addition - Artificial reef — Hoi Ha Wan Marine Park

OPP-3P60QApermanent identifier · cite as oceanportfolio.org/p/OPP-3P60QA

Published as: Coral recruitment onto an experimental pulverized fuel ash-concrete artificial reef | Technique: Substrate Addition - Artificial reef | Disturbance addressed: Land reclamation | Genera: Oulastrea, Culicia | Method: An experimental artificial reef was used to document natural coral recruitment onto a stabilised pulverised fuel ash (PFA)–concrete artificial reef.The blocks were deployed in a random fashion from a barge within the gazetted site, in a pyramid shape. Additionally, 176 test blocks made from four cement/PFA (pulverised fuel ash) mixes were placed to determine seasonal patterns of coral recruitment. Cumulative coral recruitment onto the artificial reef was studied over a period of two years. | Post-restoration monitoring: 24 months | Authors' conclusion: Two species of coral recruited to the blocks. O. crispata settled predominantly on the undersides of the reef blocks, and C. japonica had a preference for exposed surfaces. O. crispata did not show a preference for block composition whereas C. japonica favoured blocks with high (75% by volume) PFA levels. | Lessons reported: This shows that PFA–concrete is a potential substratum for artificial reef construction, especially when such reefs aim at rehabilitating corals. | This record was compiled from a published source and has not been confirmed by the organisation that carried out the work. No contribution to the condition index is recorded: the source reports survival of transplanted material, which is not a measure of ecosystem condition.

Recorded result

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