SIMULATOR OF FISH SOUNDS Russian patent published in 1998 - IPC

FIELD: fish industry. SUBSTANCE: simulator of fish sounds has resonator 4 which is made in the form of cylinder. Resonator has hole 7 in its side surface which is closed by member made of elastic material in the form of flap 8. This makes stimulating mechanism or resonator 4 operating closer to natural. Resonator 4 is connected by passage 9 with hollow of head-piece 3. Created in upper part of head-piece 3 is back-pressure space 10, and made in body of head-piece 3 is passage 11 which connects space 10 with chamber 2 used for accumulation of compressed air. Resonator 4, head-piece 3, and chamber 2 are successively mounted on air delivery pipe 1 having hole 12. Chamber 2 is provided with cover 13 which is installed for possible axial displacement for adjustment of compressed air flow rate. Aforesaid simulator of fish sounds ensures effective emittance of sound signal at any depth of water with maximal approximation of signal spectrum to spectrum of natural signals of fish. Enhanced biological action is achieved by adjusting flow rate of compressed air depending on regular composition of attracted objects. EFFECT: higher efficiency. 1 cl, 2 dwg