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ANALYSES OF SMALL TANK ACOUSTICS: EMPIRICAL AND THEORETICAL APPROACHES

Due to practical constraints, most of fish sound recordings are made in small tanks. Because of the boundary effects, serious distortion of recorded sound is expected (Parvulescu 1967). Thus there is a considerable need for a basis for interpreting the fish sound spectrum recorded in small tanks and providing practical ways of extracting useful information. Here we present the mechanism of spectrum distortion observed in small tanks both in empirical and theoretical ways. The minimum resonant frequency of small rectangular tanks with coordinates of X, Y, and Z, respectively, is provided by solving the wave equation (Kinsler et al 2000) as follows: