IMITATOR OF FISHES SOUNDS Russian patent published in 2009 - IPC A01K79/00 

FIELD: agriculture.

SUBSTANCE: imitator contains pipe for supply of compressed air from source, accumulating chamber for accumulation of compressed air with control volume, nozzle with channels for air passage and mechanism of air portioning, having valve, and resonator in the form of cylinder, communicated to nozzle by means of channel. Nozzle outside has bevel truncated side surface, which ends with sharp circular ledge. On side surface of nozzle in non-bevel non-truncated part of it there is a circular bore. In bore there is a toroidal rubber ring. Cylindrical shell of resonator is arranged as elastic and is pressed with internal surface from one side to toroidal rubber ring and bevel truncated side surface of nozzle. On the other side cylindrical shell is pressed to side surface of nozzle, in wall of which there are exhaust holes, which are covered with elastic shell. Volume of air cavity produced by cylindrical shell of resonator, is arranged as adjustable and equal to volume of fish air bladder, onto which action of imitator signals is directed. Nozzle is installed on pipe for supply of compressed air with the possibility of axial displacement and fixation in required position.

EFFECT: such design makes it possible to develop radiation of sounds of physostomous fishes as maximally approximate to natural sounds produced by organs of physostomous fishes, and also possibility to control parametres of radiated sounds depending on size species composition of fishes and to increase reliability of device start-up.

4 cl, 3 dwg