On the frequency dependence of target strength of mature herring
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Original versionThis report is not to be cited without prior reference to the authors
Mature herring (Clupea harengus), hibernating in Ofotfjord in December 1991, was measured simultaneously at each of three frequencies: 18, 38, and 120 kHz. Measurements of the mean volume backscattering coefficient were integrated over the water column and averaged over 0.1- nautical mile intervals. Through a regression analysis of the resulting values of area backscattering coefficient, performed for pairs of frequencies, the ratio of backscattering cross sections o was determined.