Biorock

Biorock
A community-driven reef restoration and conservation project started in 2000 that has changed not only the reef itself, but also the attitudes, livelihoods and economy of the entire region.
Bio-Rock is a technology that uses low voltage electrical current on artificial underwater structures to encourage growth of Corals and other reef life. Experiments with the technology worldwide have shown that it can help counteract some of the difficult environmental factors affecting coral growth.
In the past Pemuteran reefs have suffered greatly from damage by destructive fishing and the El Nino effect. Pemuteran village residents have taken action to prevent use of these destructive methods in their reefs, whether by locals or by outsiders.
Coral nurseries were built using the Electrolytic Mineral Accretion Technology, which provide unique advantages for restoring coral reefs. Corals grown on mineral accretion are exceptionally brightly coloured and rapidly growing, and support dense fish populations. The coral nursery structures are made of welded construction steel bars, of around1 centimetre diameter. They are built in a variety of shapes. The success of these structures in stimulating rapid coral growth was apparent within months, leading to requests to greatly expand the project. All structures are charged by power supplies located on the adjacent land.
More then fifty-six Biorock coral nursery structures have been installed since June 2000 in Pemuteran Village. With a total length of 300 metres situated in an area of 2 hectares, this is the largest Biorock coral reef nursery and restoration project worldwide.

These structures are located in an area parallel to the shore, about 50-100 metres from the coastline, in waters ranging from about 3 to 7 metres deep. They are roughly lined up, forming a natural snorkelling and diving trail. Komang Astika of the Biorock Centre is in charge of maintaining the structures, he is the guardian of the reef, go by and have a talk with him. He will inform you on the status of different projects.
http://www.globalcoral.org/pemuteran_coral_reef_restoration.htm