All manner of concrete, steel, and stone rubble from dredging, demolition projects, and other construction is used as artificial reef materials. This material is generally available at very low cost or free from construction companies who are more than happy to get rid of it. Transportation costs determine where this material is used by the Reef Program.
Old vessels make excellent artificial reefs. They provide high profile structure for pelagic fish, low profile structure for demersal fish, as well as surface area for the attachment of mussels, barnacles, tubeworms, and other food organisms. Shipwrecks have been the basis for the state's bottom fisheries which feature sea bass, tautog, ling, cod, and pollock. and for recreational scuba diving activities. The New Jersey coast has a large number of shipwrecks, estimates range from 500 to 3,000. These wrecks are the result of 200 years of maritime disasters and enemy submarine operations during World Wars I and II.