FISH PASS FOR FISH PASSAGE FROM ONE HYDROSYSTEM POOL TO ANOTHER ONE Russian patent published in 2007 - IPC E02B8/08 

FIELD: hydraulic building, particularly fish passes permitting fish passage through support structures to fish hatchery and growth areas.

SUBSTANCE: fish pass comprises fish-passing canal made as gutter, which connects upper and lower hydrosystem pools, feeding unit gate installed in fish-passing canal from upper pool side and providing full opening of fish-passing canal throat. Fish pass also has horizontal guiding means made in side depressions and parallel thereto, swimming-in orifices arranged along fish-passing canal width and double-flap transversal partitions installed in side depressions. The transversal partitions may be moved by means of drive with respect to side depressions and fish-passing canal. Flap ends facing each other are connected one with another through guiding means made as hinge. Flap end facing upper pool is supported by pin. Device also has longitudinal partition, urging means and bucket. Longitudinal partition is installed along longitudinal gutter axis and divides fish-passing canal into two independent fish-accumulation sections. Urging device has mesh web provided with vertical slot arranged in front of longitudinal partition. Rubber aprons are connected to slot sides. Bucket is installed in bottom depression made in upper section of fish-passing canal. Side depressions are made in longitudinal partition sides. Flaps of transversal partitions are perforated and define swimming-in orifices, which permit free fish passage. The swimming-in orifices are arranged in staggered order across area of transversal partition flaps.

EFFECT: provision of conditions stimulating fish movement via fish pass at varying environment parameters.

8 cl, 19 dwg