Provided is a multi-hole nozzle for use in aquatic pest control which, while supplying water, physically kills aquatic pests and thereby allows intake water to be directly supplied to a culture tank or a ballast tank without the need for a pre-treatment water tank, chemical agents, or neutralizing agents. This multi-hole nozzle A for aquatic pest control has three or more adjacent nozzle holes 1, each nozzle hole 1 being configured from: an inlet-side opening section 2 having a diameter that decreases from an inlet opening to a throat section 3 at the center of the hole; an outlet-side opening section 4 having a diameter that increases from the throat section 3 to an outlet opening; and the throat section 3, which has the smallest inner diameter. The adjacent nozzle holes 1 are spaced apart by such a distance that the inlet-side opening sections 2 thereof interfere each other. Partitions 5 of the interference portions 6 of the inlet-opening sections 2 are cut out in a U-shape, and the remaining portions 5a be
