An Empirical Equation for the Determination of the Maximum Side-Aspect Target Strength of an Individual Fish
2007
Love, Richard H.
Experiments are described in which the target strengths of a number of individual fish were measured at various frequencies. The results of these experiments are combined with results from six other sources and an empirical equation approximating the maximum side-aspect target strength of an individual fish is found to be: T = 24.1 log L - 4.1 log lambda - 33.2, for 1 < or = L/ lambda < or = 100, where T is the target strength at one yard in dB, L is the fish length in feet, and lambda is the acoustic wavelength in feet. This result is combined with a theoretical estimate of the resonance of a fish containing a swimbladder, to produce a curve approximating the maximum side-aspect target strength of an individual bladder-fish for L/lambda < or = 100.
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