Use of ultrasonic telemetry to locate the spawning area of Chinese sturgeons

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 spawned