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Concrete In Australia : June 2013
8 Concrete in Australia Vol 39 No 2 NEWS Gold Members Concrete reefs created in Western Australia Two purpose-built arti cial reefs for recreational shing have been completed in Geographe Bay, Western Australia, as part of the state government s $2.38 million sheries strategy to develop a sustainable resource. In April, Western Australia sheries minister Troy Buswell opened the state s rst trial arti cial reefs, located o Dunsborough and Bunbury. " is trial is aimed at providing quality shing experiences and increasing sh stocks, to assist in the sustainable management of Western Australia s sh resource," Buswell said. e internationally proven design from Australian company Haejoo includes construction and deployment of concrete modules. Each arti cial reef is made up of thirty 10t reinforced concrete modules placed in six clusters in the 4ha reef area. Purpose-built arti cial reefs are designed to create complex spaces and habitats with di erences in light, shade and water ow to encourage further colonisation of marine organisms. e reef structures can be tailored to suit the requirements of speci c target species such as rock lobster, abalone, demersal (living on or near the sea oor) or pelagic n sh (living near to the surface or higher up in the water column). e modules can also be designed to create an up-welling e ect -- diverting more nutrient-rich colder water from the seabed up in the water column. is creates food for plankton and larval sh, which attracts small sh, which in turn attracts larger sh. e fabrication of all 60 arti cial reef modules was carried out in Australind at MJB Industries, a local concrete pipe manufacturer. Each module weighs 10t and required approximately 580t of locally supplied concrete by Australind Premix and 20t of steel reinforcement. Haejoo has donated one of its 10t reef modules to the City of Busselton for permanent display at the Quindalup boat ramp to be used for public education. The concrete modules were fabricated at MJB Industries in Australind.