A hydroacoustic device adapted to be used in a liquid medium, the hydroacoustic device comprising: • a converter of liquid-medium oscillations and electrical signals, the converter being capable of receiving and/or transmitting hydroacoustic signals, the converter having a cylindrical form, • a first disk-shaped printed or wire board comprising a receive/transmission signal path connected to a switch cable for providing power and transmitting electrical signals, the diameter of the first disk-shaped printed or wire board being equal to the diameter of the cylindrical converter, • a second disk-shaped printed or wire board, the diameter of the second disk-shaped printed or wire board being equal to the diameter of the cylindrical converter, • a protective material allowing for a transmission of the hydroacoustic oscillations and being a waterproof compound, one base of the cylindrical converter being disposed on the first printed or wire board, and the other base of the cylindrical converter being disposed on the second printed or wire board, each of the first and second printed or wire circuit board comprising a first outer surface oriented away from the cylindrical converter and a second inner surface oriented toward the cylindrical converter, the cylindrical converter comprising a first inner surface, and a second outer surface, a single housing of the hydroacoustic device being formed by: • the first outer surface of the first printed or wire circuit board, • the first outer surface of the second printed or wire circuit board, • the second outer surface of the cylindrical converter, and • the protective material which is configured to coat said first outer surface of the first printed or wire circuit board, first outer surface of the second printed or wire circuit board, and second outer surface of the cylindrical converter, the cylindrical converter, the first printed or wire circuit bord and the second printed or wire circuit board being adapted to be used as a structural support element of the single housing, the hydroacoustic device being characterized in that the hydroacoustic device comprises a support rod positioned inside the inner surface of the cylindrical converter and extending from the second inner surface of the first printed or wire circuit board to the second inner surface of the second printed or wire circuit board, and in that the support rod is configured to additionally support a load resulting from an external pression of the liquid medium to the end surfaces of the single housing. • a converter of liquid-medium oscillations and electrical signals, the converter being capable of receiving and/or transmitting hydroacoustic signals, the converter having a cylindrical form, • a first disk-shaped printed or wire board comprising a receive/transmission signal path connected to a switch cable for providing power and transmitting electrical signals, the diameter of the first disk-shaped printed or wire board being equal to the diameter of the cylindrical converter, • a second disk-shaped printed or wire board, the diameter of the second disk-shaped printed or wire board being equal to the diameter of the cylindrical converter, • a protective material allowing for a transmission of the hydroacoustic oscillations and being a waterproof compound, one base of the cylindrical converter being disposed on the first printed or wire board, and the other base of the cylindrical converter being disposed on the second printed or wire board, each of the first and second printed or wire circuit board comprising a first outer surface oriented away from the cylindrical converter and a second inner surface oriented toward the cylindrical converter, the cylindrical converter comprising a first inner surface, and a second outer surface, a single housing of the hydroacoustic device being formed by: • the first outer surface of the first printed or wire circuit board, • the first outer surface of the second printed or wire circuit board, • the second outer surface of the cylindrical converter, and • the protective material which is configured to coat said first outer surface of the first printed or wire circuit board, first outer surface of the second printed or wire circuit board, and second outer surface of the cylindrical converter, • the first outer surface of the first printed or wire circuit board, • the first outer surface of the second printed or wire circuit board, • the second outer surface of the cylindrical converter, and • the protective material which is configured to coat said first outer surface of the first printed or wire circuit board, first outer surface of the second printed or wire circuit board, and second outer surface of the cylindrical converter, the cylindrical converter, the first printed or wire circuit bord and the second printed or wire circuit board being adapted to be used as a structural support element of the single housing, the hydroacoustic device being characterized in that the hydroacoustic device comprises a support rod positioned inside the inner surface of the cylindrical converter and extending from the second inner surface of the first printed or wire circuit board to the second inner surface of the second printed or wire circuit board, and