Manual of methods for fisheries resources survey and apparaisal / S. T. Forbes, O. Nakken
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TextoDetalles de publicación: Italia : FAO Food and Agricultue Organization of the United Nations 1972Edición: 1Descripción: 74 PTema(s): 1. STATISTICS 2. MANUAL-METHODS-FISHERIES 3. ECONOMETRY 4. FISHERIESResumen: Physical properties of sound in water, ist propagation and reflection from targets,derectivity of transducers, description of the soun field; the structure and functioning of sonar equipment, horizontal echo-ranging systems, the identificacion of targers and charactereistic of cho records, abundance estimation, practical methods, new developments in sonar techniques, survey and sampling considerations, new developments in sonar techniques, continuoes transmission frequency-modulated (CTEM) sonar.
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Physical properties of sound in water, ist propagation and reflection from targets,derectivity of transducers, description of the soun field; the structure and functioning of sonar equipment, horizontal echo-ranging systems, the identificacion of targers and charactereistic of cho records, abundance estimation, practical methods, new developments in sonar techniques, survey and sampling considerations, new developments in sonar techniques, continuoes transmission frequency-modulated (CTEM) sonar.
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