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

摘要: Fishways designed for salmonids often restrict passage by non-salmonids, and effective tools are needed both to identify problems nontarget species inform remediation planning. In this case study, we used migration histories from 2170 radio-tagged adult Pacific lamprey (Entosphenus tridentatus) locations of poor (bottlenecks) at a large, multifishway dam. Over 10 years, 49% tagged that entered fishways failed pass the Models accounting repeated attempts individual indicated successful strongly depended on attempted route. Success also varied with time fishway entry, water temperature, body size. Most terminated in lower segments, but extensive seasonal shifts bottleneck were detected. Ranking metrics helped prioritize bottlenecks identified sites where structural or operational modifications should improve passage. Our integration spatially int...