Skip to main content
U.S. flag

An official website of the United States government

Downstream migration and multiple dam passage by Atlantic Salmon smolts

October 13, 2017

The purpose of this study was to investigate behavior and survival of radio-tagged wild and hatchery-reared landlocked Atlantic Salmon Salmo salar smolts as they migrated past three hydropower dams equipped with fish bypass solutions in the Winooski River, Vermont. Among hatchery-reared smolts, those released early were more likely to initiate migration and did so after less delay than those released late. Once migration was initiated, however, the late-released hatchery smolts migrated at greater speeds. Throughout the river system, hatchery-reared fish performed similarly to wild fish. Dam passage rates varied between the three dams and was highest at the dam where unusually high spill levels occurred throughout the study period. Of the 50 fish that did migrate downstream, only 10% managed to reach the lake. Migration success was low despite the presence of bypass solutions, underscoring the need for evaluations of remedial measures; simply constructing a fishway is not synonymous with providing fish passage.

Publication Year 2017
Title Downstream migration and multiple dam passage by Atlantic Salmon smolts
DOI 10.1080/02755947.2017.1327900
Authors D. Nyqvist, Stephen D. McCormick, L. Greenberg, W.R. Ardren, E. Bergman, O. Calles, Theodore R. Castro-Santos
Publication Type Article
Publication Subtype Journal Article
Series Title North American Journal of Fisheries Management
Index ID 70191484
Record Source USGS Publications Warehouse
USGS Organization Leetown Science Center