FIELD: hydraulic structures, particularly fish passes to permit fish passage through support structures to fish hatchery and growth areas.;SUBSTANCE: fish pass comprises waterway made as a channel with head part connected to upper pool and mouth part communicated with lower pool of hydrosystem, spawning substrate made as gravel-and-pebble filling laid on channel bottom and slopes, rough members located on channel bottom and extending at an angle to longitudinal channel axis along the full length thereof. The flexible shells are connected by inlet air channels with distribution manifold and compressor. The flexible elastic shells are arranged inside the latticed frame. Lower frame part is connected to concrete base having cross-section shaped as inverted T. Vertical concrete base part faces frame interior and is arranged in base center.;EFFECT: possibility to reduce excessive kinetic energy of the flow.;7 cl, 20 dwg
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