PROBLEM TO BE SOLVED: To provide a device, system and method for aquaculture of marine products in which an ultrasonic wave in an acoustic wave is made to uniformly irradiate the inside of an aquarium by a simple structural device, and thereby the resistance force of the cultivating marine products is improved to raise a survival rate and the harvest can be improved.SOLUTION: An acoustic wave is made to irradiate marine products 29 cultivating, the acoustic wave that is at least any one of sound waves and ultrasonic waves. A device for aquaculture of the marine products includes an ultrasonic vibrator 20 capable of generating the acoustic wave, a drive unit 15 for driving the ultrasonic vibrator 20, and an outer case 12 holding the ultrasonic vibrator 20 and the drive unit 15. The device includes an acoustic wave diffusion layer 24 in a front side where a high strength acoustic wave 19 emitted from the ultrasonic vibrator 20 is emitted, the acoustic wave diffusion layer that diffuses the high strength acoustic wave 19 and converts it into a low strength acoustic wave 21 having weak strength per unit area for irradiation and comprises an acoustic wave diffusion material.SELECTED DRAWING: Figure 1【課題】簡単な構造の装置により、音響波中の超音波を水槽内で均一に照射して、養殖している水産物の抵抗力を向上させて生存率を上げ、収穫量を向上させることができる水産物養殖装置と水産物養殖システム及び水産物養殖方法を提供する。【解決手段】養殖している水産物２９に、音波及び超音波の少なくともいずれかである音響波を照射する。音響波を発生可能な超音波振動子２０と、超音波振動子２０を駆動する駆動部１５と、超音波振動子２０及び駆動部１５を保持した外ケース１２とを備える。超音波振動子２０から発せられる高強度音響波１９が放射される前面側に、高強度音響波１９を拡散させるとともに、単位面積当たりの強度が弱い低強度音響波２１に変換し照射させる音響波拡散材料から成る音響波拡散層２４を備える。【選択図】図1
