SIMULATOR OF FISH SOUNDS Russian patent published in 1998 - IPC

FIELD: fish industry. SUBSTANCE: this relates to acoustic devices used for directing runs of fish to fishing zone. Simulator has compressed air source 1, and connected to its output is control unit 2. Flexible pipeline 5 successively connects compressed air source 1 and acoustic signal radiators 6-20 which are combined in groups 21-25. Installed in front of each group of radiators beginning from second group is extreme non-return valve 27-30 and receiver 31-34 of fixable volume which is larger than in preceding group. Alternating engagement and disengagement of radiators in groups 21-25 simulate movement of fish runs and stimulate direction of fish movement from distant areas to zone where fishing tools 26 are operating. Application of aforesaid device improves operating efficiency due to increased range of operation and better simulation of fish sound movement. EFFECT: higher efficiency. 2 dwg