Application of blue LED irradiation to antifouling of a ship´s bottom

We examined the effectiveness of LED irradiation on the inhibition of cypris larvae settlement onto an adhesion plate, on which the certain area located just under the light source was continuously covered with the light. So far examined, the inhibition percentage of the population in the area varied from zero at 465.0 nm to 3.0±1.4% cm^-2 at 600.0 nm in the laboratory experiment although the maximum irradiance of LEDs differed from 170.7 W m^-2 at 500.0 nm (blue-green) to 293.6 W m^-2 at 465.0 nm. Similar results were obtained from the field experiment, indicating that blue LEDs with high irradiation has potential to inhibit the settlement of cypris larvae onto a ship´s bottom.