2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/21/2019 | 10:15 AM - 10:30 AM | HYDRAULIC CONDITIONS INFLUENCE CAPTURE AND UPSTREAM PASSAGE OF WHITE SUCKER AND INVASIVE SEA LAMPREY IN A POOL-TYPE FISHWAY | 250 CF

HYDRAULIC CONDITIONS INFLUENCE CAPTURE AND UPSTREAM PASSAGE OF WHITE SUCKER AND INVASIVE SEA LAMPREY IN A POOL-TYPE FISHWAY

Fishways in the Great Lakes watershed mitigate fish habitat fragmentation, but also increase risk of invasive sea lamprey (Petromyzon marinus) infestation upstream of dams. Techniques that guide sea lamprey into traps while allowing passage of desirable fishes would help managers minimize risk of sea lamprey infestation while addressing connectivity targets. We tracked sea lamprey and white sucker (Catostomus commersonii) as they navigated a pool-type fishway to examine how hydraulic conditions influenced capture and upstream passage. Upstream passage rates for white sucker and sea lamprey were high under streaming flow conditions. Increasing the head difference between pools by 1 cm resulted in a 6% decrease (95% CI: 4-8%) in white sucker upstream passage and a 31% decrease (95% CI: 28-34%) for sea lamprey. Sea lamprey capture rate was higher during streaming flow conditions compared to plunging flow and a 1 degree Celsius increase in water temperature was associated with a 29% decrease (95% CI: 22-36%) in capture rate. Surface-oriented behavior at high temperatures and attraction to surface turbulence likely drove reductions in sea lamprey capture rate in our bottom-oriented trap at high temperatures and during plunging flow conditions.

Dams
Fish
Conservation

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Presenters/Authors

Sean Lewandoski (), USFWS, sean_lewandoski@fws.gov;