MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY
Biorock reef restoration. Healthy hard corals beginning to grow on a Biorock reef restoration structure made from old bicycles. The Biorock process was developed by Thomas Goreau and Wolf Hilbertz in the 1970's. Electricity is used to promote the deposition of calcium carbonate, which builds up on the surface of the structure giving hard corals a base to bond to. The process is thought to accelerate coral growth by up to four times - however, it has been suggested that simple wire meshes are just as effective. The resulting 'reef' of hard coral soon attracts other inhabitants and the process has been touted as a way to rehabilitate reefs in all tropical areas. Photographed in Pemuteran, Bali, Indonesia.
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