Gezhouba Dam was built in 1981 across the Yangtze River at Yichang, Hubei Prov-ince, China. It blocked the upstream spawning migration of all anadromous species offish, including the Chinese sturgeon Acipenser sinensi...Gezhouba Dam was built in 1981 across the Yangtze River at Yichang, Hubei Prov-ince, China. It blocked the upstream spawning migration of all anadromous species offish, including the Chinese sturgeon Acipenser sinensis. Although the main historicalspawing areas of Chinese sturgeons were far upstream of the dam, successful spawning inthe reach below the dam has been documented each year since 1982 by collecting展开更多
Anadromous alosines are widespread throughout the Northern Hemisphere.Juveniles of this clade are notoriously fragile animals that are at high risk of injury and death associated with passage at hydroelectric faciliti...Anadromous alosines are widespread throughout the Northern Hemisphere.Juveniles of this clade are notoriously fragile animals that are at high risk of injury and death associated with passage at hydroelectric facilities.Although turbine mortality is a common concern,conditions encountered when bypassed around these routes may also be hazardous.Downstream bypass structures typically discharge into plunge pools,which are highly turbulent and may cause mechanical injury.We subjected live,actively migrating juvenile blueback herring to a suite of realistic plunge pool conditions(3 m drop,pool depth of 60-180 cm,and discharge of 0.28-1.70 m^(3)/s)and monitored them for≥96 h.Survival was generally higher than expected(>80%in all cases).However,both plunge pool volume and total discharge affected survival with elevated discharge and shallow conditions associated with increased mortality.Mortality was often delayed:rates remained elevated throughout the monitoring period,indicating that survival studies based on shorter periods underestimate total mortality.展开更多
基金Project supported by the United States-China Natural Program.
文摘Gezhouba Dam was built in 1981 across the Yangtze River at Yichang, Hubei Prov-ince, China. It blocked the upstream spawning migration of all anadromous species offish, including the Chinese sturgeon Acipenser sinensis. Although the main historicalspawing areas of Chinese sturgeons were far upstream of the dam, successful spawning inthe reach below the dam has been documented each year since 1982 by collecting
基金This work was funded through a collaborative agreement between USGS and Albany Engineering Corporation.,Albany,NY(AE)(agreement#18ENLB500001).
文摘Anadromous alosines are widespread throughout the Northern Hemisphere.Juveniles of this clade are notoriously fragile animals that are at high risk of injury and death associated with passage at hydroelectric facilities.Although turbine mortality is a common concern,conditions encountered when bypassed around these routes may also be hazardous.Downstream bypass structures typically discharge into plunge pools,which are highly turbulent and may cause mechanical injury.We subjected live,actively migrating juvenile blueback herring to a suite of realistic plunge pool conditions(3 m drop,pool depth of 60-180 cm,and discharge of 0.28-1.70 m^(3)/s)and monitored them for≥96 h.Survival was generally higher than expected(>80%in all cases).However,both plunge pool volume and total discharge affected survival with elevated discharge and shallow conditions associated with increased mortality.Mortality was often delayed:rates remained elevated throughout the monitoring period,indicating that survival studies based on shorter periods underestimate total mortality.
