Figure 4. A sensor-packed synthetic salmon that passes through the turbines at Bonneville Dam and other hydroelectric projects on the Columbia River to measure the conditions that real fish encounter on the way to the Pacific Ocean. The Pacific Northwest National Laboratory (PNNL) developed the sensor to collect information to improve the passage of endangered salmon.
Courtesy: PNNL; Bonneville Dam and salmon smolts are courtesy of the U.S. Army Corps of Engineers.