The present invention is to solve a problem of the prior art. In the problem, when a ship is anchored near land for a long time (in other words, when a ship is exposed to a low-salinity sea water environment), a concentration of salt included in the sea water flowing into a cooling system installed in the ship is lowered as compared with the concentration of salt included in the normal sea water, and an MGPS which is a device for preventing marine creatures included in the seawater from increasing is not effectively operated. The present invention relates to a marine creature attachment prevention apparatus of a low-salinity seawater generator and a marine creature attachment prevention method using the marine creature attachment prevention apparatus. As technical characteristics, when a ship is exposed to a low-salinity seawater environment equal to or lower than a predetermined salinity, high-salinity seawater discharged from a fresh water generator is not discharged and is introduced into the MGPS. When the concentration of salt included in the seawater discharged from the fresh water generator is not sufficiently high, the seawater discharged from the fresh water generator is not discharged out of the ship, and is allowed to pass through a recirculation cycle of storing the seawater in a recirculation tank introducing the seawater into the fresh water generator again, and it is possible to supply the seawater having a salt concentration equal to or higher than a predetermined level to the MGPS. The high-salinity seawater generated while generating fresh water in the fresh water generator is supplied to the marine creature attachment prevention apparatus. Accordingly, even when the ship is exposed to the low-salinity seawater environment, it is possible to provide a method capable of effectively preventing marine creatures from increasing.
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