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Simulation of echo data can be useful for verifying echo integrators realized in computer software. A model is presented which associates distinct stochastic processes with each of the following: bottom depth; number, depth, and orientation of fish in the beam; and background noise. A measure of realism is preserved, perhaps, by (1) simulating echo registration with an ideal circular transducer of 8-deg beamwidth, moving forward at 10-knots speed; (2) allowing individual fish to be tracked through the beam; and (3) using measurements on fish to describe the target strength. Attendees may form their own opinion of the success of the simulation from examples to be shown - in colour.