Fish intake mortality at power stations the problem and its remedy

Summary Fish larvae and juveniles are not strong enough to maintain in the water flow occurring at cooling water intakes of power stations. Therefore, they are drawn into the cooling water system and show considerable mortality mainly due to mechanical causes. In this paper several measures are discussed which may lead to a reduction of this problem. Special emphasis is laid on site selection in low productive areas, reduction of the volume of cooling water, careful removal and transport from the screens and preventing fish from entering the intake. Illumination of the intake area during night appears to be an effective means in decreasing the large nocturnal fish inflow. It is suggested to modify the current cooling water standards in order to diminish the intake fish mortality.