Acoustic measurements of schooling herring. Estimation of school biomass and target strength
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The connections between reflected echo energy and dimensions of fatty herring schools were studied by a combination of multibeam sonar and a calibrated echo integration unit. A relation between the area and the biomass of the schools was established. A target strength relation was derived by preseining echo integration and sonar measurments of schools. Method deficiencies and improvements for school biomass estimation using sonar and preseining target strength measurements are discussed.