MEMBER FOR EXTERMINATION OF HARMFUL AQUATIC ORGANISMS, ADD-ON EXTERMINATION DEVICE AND CULTURE FACILITY

摘要

PROBLEM TO BE SOLVED: To provide an extermination member or extermination device using a multiple nozzle for extermination of harmful aquatic organisms, and a culture facility using them.SOLUTION: A piping-installed extermination member comprises: a flange plate for placing a multihole nozzle A; and one or a plurality of multihole nozzles A for extermination of harmful aquatic organisms. The multihole nozzle A has three or more adjacently-provided nozzle holes 1 that respectively comprise: an inlet-side opening part 2 which has a diameter decreased in a direction from an inlet opening toward a throat part 3 in the center of the hole; an outlet-side opening part 4 which has a diameter increased in a direction from the throat part 3 toward an outlet opening; and the throat part 3 which has a minimum inner diameter. The inlet-side opening parts 2 of the adjacent nozzle holes 1 are provided within a mutually-interfering distance, a dividing wall 5 at an interference portion between the inlet-side opening parts 2 is cut in a U-shape, and an uncut portion 5a between the adjacent U-shaped cut portions 5b is formed into a tip of a blade.SELECTED DRAWING: Figure 4