They have been told by God knows who most probably some NGO's that the fish stock will suffer with the plant but this unfounded, I just come across this intresting link:
Ecological and Environmental Protection - JSC «Institute Hydroproject»
Aquatic Life
The next step of the protection complex was the fish protection concentrator with vertical separation. It was decided not to use traditional mesh, grids and other filtering elements, which with intensive fouling could not cope with so great amount of organic matter. Its structural design in principally new and it permits avoiding direct contact of fish and biomass particles with largely perforated protective water intake surface. To increase fish protection effectiveness the concentrator was additionally equipped with air-bubble curtain to stimulate withdrawal of organisms to the upper fish diversion system. Its connection with the sea alongshore canal permits withdrawal of fish and other aquatic organisms to the safe zone equipped with artificial reefs presenting a system of near-shore tetrapods. They serve to provide around the dyke the formation of favorable habitats preventing fish from migration to the dangerous water intake zone.