FAO.org

This technical paper provides information on provisions, made in the USSR, to facilitate fish migration under conditions of modified river flow resulting from engineering construction (e.g. dams) and water abstraction. The fish-pass and fish protection structures described utilise a knowledge of the physiology, biology, ecology and behaviour of the migrating species. The principles of their design and operation are elaborated in relation to characteristics of the species of fish concerned. Structures described include sluice fish-passes, hydraulic and mechanical fish-lifts and mobile devices for fish collection and transfer, together with protection and guiding devices used to ensure downstream migration of young fish.