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Effect of fish behavior on echo energy the need for measurements of orientation distributions



Effect of fish behavior on echo energy the need for measurements of orientation distributions



Journal du Conseil Conseil International pour l'Exploration de la Mer 39(2): 193-201



The proper target strengths to be used in establishing target-strength-to-fish-length regressions for use in interpreting acoustic measurements of fish abundance are the averages of target-strength functions with respect to the orientation distribution of the fish. Averaged target-strength regressions are computed for cod, Gadus morhua, at 38 kHz, for which measurements of dorsal aspect target-strength functions are available, for 3 kinds of behavior as defined by observed and postulated tilt-angle distributions. Errors incurred in abundance estimation due to the misuse of taret-strength regressions are computed and found to be significant. Empirical evidence for the behavior dependence of echo energy is adduced through an analysis of observations of a nonmonotonic dependence of echo energy on fish-number density for encaged aggregations of fish. The need for measurements of orientation distributions of fish whose abundance is to be determined acoustically is noted.

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Accession: 005239323

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