Abstract: To conserve downstream migratory fish, a variety of fish passage facilities have been built in view of the specific operating characteristics and the needs of fish conservation when building dams and weirs. In this paper we first briefly introduce measures frequently adopted to help downstream migratory fish pass a dam through spillway, turbine, fishway, fish transportation system and ship lock, etc. In subsequence we introduce in details the new technologies in foreign countries developing passage facilities for downstream migratory fish such as surface collector, full-depth fish gathering technology, bypass, fish trap-transportation system, fish-friendly turbine and auxiliary technologies. Finally we propose that we should learn the experiences from developed countries to meet the great needs of downstream migratory fish to passage dams in China, particularly fish gathering and fish guiding technologies. Meanwhile, China will need to develop fundamental research and make breakthroughs in the area of fish passage.

Key words: fish, downstream migration, hydropower project, fish passage facilities, passing dam technology for downstream migratory fish, full-depth fish gathering technology, fish trap-transportation system