The sound treatment did not impact the density of salmonids measured within the lock chamber. A successful technology causes a desired change in fish behavior, e.g., direction, avoidance, or attraction. Stimuli include electricity, light, sound, and changes in the water flow field. Structures such as louvers and angled-bar racks integrate behavioral technologies. These have guided Atlantic salmon smolts and juvenile and post-spawned American shad and river herring downstream at hydroelectric dams in the Northeast.
Effectiveness differs under varying design and site conditions and between species and life stages.
The number of target species considered in the Northeast has increased. Fish physiology and behavior and environmental stimuli should be evaluated. Emphasis should be on developing effective means, including behavioral fish guidance devices, to guide fish moving upstream and downstream at water developments in the Northeast. Flows into the culvert were up to 62.5 cms, with maximum instantaneous water velocities of 1.7 mps. We installed ten flash heads adjacent to the north filling culvert and ran lights at 600 watts with a pulse rate of 300 flashes per minute.