SPAWNING SYSTEM FOR REOPHILIC FISH REPRODUCTION Russian patent published in 2006 - IPC E02B8/08 A01K61/00 

FIELD: hydraulic building, particularly structures to provide natural brood fishes spawning.

SUBSTANCE: spawning system comprises supply unit communicating with upper hydrosystem pool and with head part of spawning channel inclined in longitudinal direction. Spawning substrate, namely gravel-sand filling, is laid on channel bottom. Channel bottom also has roughness members installed so that the roughness members are project over the spawning substrate and extend at and angle to longitudinal axis of spawning channel. The system also has fish-pass gutter communicated with spawning channel and having inlet part communicated with lower hydrosystem pool, as well as brood fish keeping chamber. The chamber is connected with fish-pass gutter and spawning channel. The fish-pass gutter is provided with locks and stimulating device formed as cart sliding along guiding members and having stimulating web to provide fish movement along the full fish-pass gutter length. The spawning channels define spiral in plane. Fish-pass gutter is communicated with spawning channel through brood fish keeping chamber, which is connected with spawning channel inlet. Fish-pass gutter end is provided with means for fish inspection and selection. The means is made as ichthyologic plate and regulation lock, which separate the fish-pass gutter from the brood fish keeping chamber. The brood fish keeping chamber has water accumulation tray arranged in parallel to it and with trapping net, which isolates the chamber and water accumulation tray. Water accumulation tray interior is communicated with fish-pass gutter end via bottom gallery. Horizontal part of bottom gallery outlet has louver gate arranged under fish arresting grid. The water accumulation tray is provided with gate to separate thereof from discharge channel. Spawning channel gutter is supported by vertical posts, which form load-bearing pier structure.

EFFECT: improved hydraulic conditions for fish spawning.

14 cl, 29 dwg