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Skorobogatov, M. A., D. S. Pavlov, A. Barekyan and L. G. Shtaf (1983). Selecting sites of projected fish passes. Doklady Biological Sciences. 272:508- 510.

One of the most important problems arising in the planning of areas for fish to pass through a dam is choosing the sites of the passes in the system at the hydroelectric center. A procedure for this choice is presented based on a comparison of the probable working efficiency of a fish pass at each possible location site. Hydraulic-biological studies carried out a few years ago make it possible to ascertain the factors influencing the formation of the paths of motion of fish, as well as the reactions of fish to various flow characteristics. The behavioral features of each school of fish are taken into account by finding the deviations of the transverse and longitudinal fish velocities from the average values. In order to determine the efficiency of a fish pass for a known flow structure in the tailwater of a hydroelectric system, all possible paths of fish motion from the initial point to the entry of the fish collecting chute are calculated. As an example , the efficiency was calculated for one operating regime of a model hydroelectric center with a fish pass located in the middle of the spillway, for passage through the system of schools of roach with an average length of 25.4 mm. This approach provides an objective evaluation of the likelihood that fish will enter a fish pass and indicates the optimum location of the pass in the hydroelectric system, as well as the optimum operating regime. In order to apply this approach to specific planning operations, it is advisable to carry out studies in two possible directions: to seek small experimental fish with behavior similar to that of spawning migrants and to study the reactions of fish likely to pass through hydroeletric centers.