For the last 3 years, members of the local community have been testing the applicability of Bio Rock technology on Koh Tao through a small pilot project built by the Koh Tao Dive Operators Club and Bio Rock Thailand. In that time, we have observed dramatic improvements in coral health and biodiversity, and fish abundance in the area on and around the Bio Rock. With the success of the pilot project, Save Koh Tao and the local community of Dive Schools and businesses have decided to construct a larger Bio Rock that will act to improve the health of our reefs and reduce the damages caused by SCUBA diving on natural areas.

The construction is set for September 2008, and fund raising efforts are already underway. This project will further increase awareness and community involvement in environmental conservation projects and improve tourist perceptions of Koh Tao. See the Koh Tao Bio Rock 2008 Project Proposal for more detailed information or if you can assist with granting and fund raising efforts.

Background

Following the mass bleaching event of 1998, the corals in Shark Bay, and Ao Taa Chaa, were almost 100% killed and by 2005 were showing little signs of recovery. To address this problem, the Ao Taa Chaa Biorock was installed in 2005 using funds from the island’s dive schools and the now disbanded Koh Tao Dive Operators Club (KTDOC).  

 Biorock is an artificial reef structure that uses low voltage electrical current to improve the growing conditions for corals and other reef organisms. This process is called mineral accretion, and uses electrolysis of sea water to lower the surrounding water pH level which causes minerals to precipitate out and collect on the structure by. Corals, calms, and other calcium carbonate secreting organisms growing on the structure are able to grow on an average of 3 to 5 times faster, and in a wider range of environmental conditions, such as warmer, more acidic, or more nutrient rich waters (Goreau 2007; Smith 2002). 
The structure of the Biorock (cathode) can be built into almost any shape with a variety of functions to create coral or fish nurseries, restore marginalized areas, control beach erosion, and support the local environment and economy.  Structures can be built by community members, private businesses, hotels, or anybody else interested in reef and coastal management. After construction based on the purpose of the structure, all of the features are joined together into one large Biorock structure.

Global Sea Surface Temperatures in 1998 and 2010 were the highest that they have been in over 650,000 years. During years of intense sunlight and warm waters, algae living inside the corals which provide for 85% of their energy is lost, causing the reefs to loose their color and turn white.  Some corals are able to recover their algae after temperatures go down, but many will die.  This was first seen on Koh Tao in 1998, when a large proportion of the islands reefs bleached and died. During this last year, widespread coral bleaching has been experienced all around the island, with some areas up to 98.1% bleached (Ao Leuk, May 20th, 2010). Already by the beginning of June 2010, 20% mortality of hard corals was seen in areas like Chalok Ban Kao during reef surveys conducted through the Save Koh Tao/SSI Ecological Monitoring Program.

During this time however, rates of bleaching and subsequent mortality have been found to be much lower on the Biorock projects than the surrounding areas. In a survey conducted on the 19th of May 2010, only 10% of the naturally growing hard corals around the Hin Fai site were considered healthy, while over 56% of the hard corals on the Biorock Structure were listed as healthy.

News about the Ao Taa Chaa Biorock Site:

The power supply for the Taa Chaa Biorock (built in 2005) broke over 1 year ago, and has not yet been fixed. The cause for the broken transformer was the electrical supply line and the age of the transformer. In order to get the project running again we will need:
• A new electrical line running from the Government grid to the site location (through OK II Resort)
• A new box installed below a bungalow at OK II Resort to house the transformer
• A new electrical transformer to power the site
• A protective cover (made from PVC) for the site anode

For more information about Biorock Structures, or if you want to use this technology on your reef or coastal area please see:

The Global Coral Reef Alliance

Biorock-Thailand

Biorock.net

In 2008, the local community of Koh Tao took the first, but very large, steps towards making marine conservation a priority for our island. Along with the Save Koh Tao Group, seventeen local dive schools and a number of local businesses donated and raised almost 1 million Baht to build a Biorock™ alternative dive site on the island. Becoming the largest Biorock in the Gulf of Thailand, and the world’s first Biorock SCUBA diver training area. This new site utilizes low voltage electrical energy to stimulate coral growth and will provide an interesting and attractive training area for new SCUBA divers before they go out to the natural reefs.

In late September of 2008, about 100 volunteers from the local dive shops and community came down every day to construct the large Biorock structure, which consists of four massive steel domes connected together to form a site that covers almost 1,000 square meters of sandy bottom. In only a short time, fish and corals will settle here and create a thriving new ecosystem, and because it is a Biorock site, the area will be better prepared to survive changing environmental conditions caused by rising sea temperatures.

The project was a great success, and had the added benefit of pulling together and educating the local community. This project is only the beginning of the new ideological state on Koh Tao where business goals and environmental stewardship go hand in hand, protecting our resources and livelihoods well into the future.

Be sure to check out the movie made by Liquid Media (free of charge) about the Hin Fai Biorock Construction.

Each week there is a lecture and dive at the biorock site. Participants get to learn about the technology and how it works before practicing research and maintenance on the

project. If you would like to attend contact This e-mail address is being protected from spambots. You need JavaScript enabled to view it (Free for Professional divers from schools that helped to fund the biorock or are involved in the EMP)

Download the Hin Fai Map .pdf Put together by DMTs at New Heaven Dive School