TITLE

Fishway passage bottleneck identification and prioritization: a case study of Pacific lamprey at Bonneville Dam

AUTHOR(S)
Keefer, Matthew L.; Caudill, Christopher C.; Clabough, Tami S.; Jepson, Michael A.; Johnson, Eric L.; Peery, Christopher A.; Higgs, Megan D.; Moser, Mary L.; Tonn, William
PUB. DATE
October 2013
SOURCE
Canadian Journal of Fisheries & Aquatic Sciences;Oct2013, Vol. 70 Issue 10, p1551
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Fishways designed for salmonids often restrict passage by non-salmonids, and effective tools are needed both to identify passage problems for nontarget species and to inform remediation planning. In this case study, we used migration histories from 2170 radio-tagged adult Pacific lamprey ( Entosphenus tridentatus) to identify locations of poor passage (bottlenecks) at a large, multifishway dam. Over 10 years, 49% of tagged lamprey that entered fishways failed to pass the dam. Models accounting for repeated attempts by individual lamprey indicated successful passage strongly depended on attempted passage route. Success also varied with time of fishway entry, water temperature, and lamprey body size. Most failed passage attempts terminated in lower fishway segments, but extensive seasonal shifts in bottleneck locations were detected. Ranking metrics helped prioritize bottlenecks and identified sites where structural or operational modifications should improve lamprey passage. Our integration of spatially intensive monitoring with novel analytical techniques was critical to understanding the complex relationships among fishway features, environmental variation, and lamprey behavior. The prioritization framework can be applied to a wide range of fish passage assessments.
ACCESSION #
90494406

 

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