Acoustic measurements of schooling herring. Estimation of school biomass and target strength
Original version
This report is not to be cited without prior reference to the authorsAbstract
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.