Multi-tube nozzle for use in eradicating harmful aquatic organisms

Abstract

Provided is a multi-tube nozzle for use in eradicating harmful aquatic organisms, which physically kills harmful aquatic organisms while feeding water and thus allows intake water to be fed directly into a culture tank or a ballast tank without the need for a pretreatment tank, chemicals, neutralizers, etc. A multi-tube nozzle (A) for use in eradicating harmful aquatic organisms includes at least three nozzle tubes () that are provided adjacent to each other. The nozzle tubes () each includes: an inlet-side opening section () having an inner diameter that decreases from an inlet opening toward a throat section () located in the middle of the tube; an outlet-side opening section () having an inner diameter that increases from the throat section () toward an outlet opening; and the throat section () having a smallest inner diameter. The adjacent nozzle tubes () are spaced apart by a distance such that the adjacent inlet-side opening sections () overlap each other. A wall () of an overlapping portion () of the inlet-side opening sections () is cut in a U shape. An uncut portion () between the adjacent U-shaped cut portions () forms a sword-like pointed tip.