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.