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Article title THE RESULTS OF DEVELOPMENT OF THE PORTABLE MULTIBEAM SONAR INTENDED FOR COUNTING FISH IN FENCED AREAS OF COASTAL FISHING ZONES AND INLAND WATERS
Authors A.N. Dolgov, M.A. Raskita, A.N. Kutsenko, S.V. Tretyakov, K.V. Kolosov
Section SECTION I. ACOUSTICS AND HYDROACOUSTICS
Month, Year 12, 2015 @en
Index UDC 519.876.5
DOI
Abstract The main results of development of the portable multibeam sonar intended for counting fish in fenced areas of coastal fishing zones and inland water bodies are overviewed in this article. Innovative solutions implemented in the work are described. Software and hardware used for the scientific sonar is indicated. Results of transducer beam measurements in both transmission and reception modes with a fan of beams are here considered. The obtained results revealed constant beam width within the fan of beams and low side lobe. One more advantage which offers the sonar is its possibility to operate at short transmit pulse length. Screenshots of the control-and-display unit made during the in-situ acoustical surveys in modes “Echogram”, ”Sector” and “3D” are here shown. Besides, the following sonar software is described, such as: the calibration program for the scientific multibeam sonar using a standard tungsten-carbide sphere; the program of acoustic data postprocessing. It is noted that to calculate target strength of the standard sphere, a dedicated software Target Strength Calculator has been created. The article describes sonar field tests and acoustical surveys for stock assessment in shallow and inland waters. The organizations and establishments which experts took part in the field tests and acoustical surveys are here mentioned. All the obtained acoustical data have been processed by means of software postprocessing package. A depth chart and biomass distribution chart within the particular inland water body are demonstrated. The histogram of target strength distribution of the detected single fish is also shown. It is also noted, that it is the first scientific sonar intended for quantitative fish stock assessment that is created in Russia including Soviet era. This is the first step to replace foreign scientific sonar equipment with domestic products capable of exploring marine bio-resources of Russia.

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Keywords Aquaculture; marine biomass monitoring; multibeam sector scanning sonar; echocounting; echointegration; hydroacoustic surveys.
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