**ABSTRACT NOT FOR CITATION WITHOUT AUTHOR PERMISSION. The title, authors, and abstract for this completion report are provided below. For a copy of the full completion report, please contact the author via e-mail at sean_lewandoski@fws.gov . . Questions? Contact the GLFC via email at slrp@glfc.org or via telephone at 734-662-3018.**

CAPTURE EFFICIENCY OF SEA LAMPREY AND PASSAGE SUCCESS OF NON-TARGET SPECIES DURING PLUNGING AND STREAMING FLOW PATTERNS IN A POOL-TYPE FISHWAY

Sean Lewandoski², Peter Hrodey², Gregory Klingler², Scott Miehls³, Paul Piszczek⁴, Daniel Zielinski⁵

^{2U. S. Fish and Wildlife Service, Marquette Biological Station, 3090 Wright St., Marquette, MI 49855}

^{3 U. S. Geological Survey, Great Lakes Science Center, Hammond Bay Biological Station, 11188 Ray Road, Millersburg, MI 49759}

^{4Wisconsin DNR, Superior Service Center, 1701 N. 4th St, Superior WI 54880}

^{5Great Lakes Fishery Commission, 310 W. Front Street, Office 310C, Traverse City, MI 49684}

June 2020

ABSTRACT:

An understanding of how undesirable and desirable fish species respond behaviorally to turbulent flow in fishways would guide development of selective fish passage techniques. We used PIT telemetry to monitor the movements of sea lamprey Petromyzon marinus and white sucker Catostomus commersonii during fishway passage attempts and determined that sea lamprey (an invasive fish in the Great Lakes Basin) upstream passage probability declined from 0.73 to 0.03 as flow conditions became increasingly turbulent, while declines in white sucker (a desirable native fish in the region) upstream passage probability were less substantial (0.53 to 0.44). Sea lamprey upstream and downstream movement rates were best predicted by principle components of maximum and spatially-averaged turbulence metrics derived from high resolution computational fluid dynamics models, while maximum total kinetic energy (TKE) best predicted white sucker movement. Deploying a sea lamprey trap in the fishway did not effectively reduce sea lamprey upstream passage probability, though capture rate increased during trials with cooler water temperature and low TKE. Bifurcated fishways that maintain low turbulent flow in the entrapment route and high turbulent flow in the upstream passage route could increase the effectiveness of trapping sea lamprey in fishways as a means to advance selective passage goals in the Great Lakes Basin.