FIELD: hydraulic structures for passing fish over dams of any height in both directions. SUBSTANCE: device has a chain of hermetic basins which connects with its ends lower pool 4 and upper pool 7. Hermetic basin chain is formed of branch 1 of lower pool, crest branch 2 and branch 3 of upper pool. Hermetic basins 8-16 are communicated with one another and with pools by means of admission hole 17-28 provided with gates 26-34. During migration fish passes successively through hermetic basins 8-16 and moves from one pool to the other. EFFECT: higher efficiency. 19 cl, 18 dwg
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