Biofouling prevention systems comprising an electrical rectifier, conductors and electrodes for emitting electrical currents and voltages; Antifouling systems for boats, docks, and marinas comprising an electrical rectifier, conductors and electrodes for emitting electrical currents and voltages; Electrochemical antifouling systems comprised of electrodes and a rectifier for emitting electrical currents and voltages that inhibit barnacles, worms, snails, and other hard-shell growth from adher...