Abstract
The estimation of fish abundance by the echo‐integration method is based on the assumption that the total integrated echo intensity returned from randomly distributed targets is proportional to their quantities. In the case where the multiple scattering between targets is negligible, the precision of this estimation can be affected by the interference between individual echos from every single target. In this work, an evaluation function to determine the eventual divergence of the estimated result from the linearity is proposed. As a function of different parameters, such as the total number and the dimension of targets, the transmitted signal frequency, distance from transducer to the network plan and the transducer beamwidth, the importance of interference effect is analyzed for a network of spheres with various spatial distributions. [Work supported by [FREMER.]
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