Passage and Behavior of Radio-Tagged Adult Pacific Lampreys (<i>Entosphenus tridentatus</i>) at the Willamette Falls Project, Oregon

Mesa, Matthew G.; Magie, Robert J.; Copeland, Elizabeth S.

doi:10.3955/046.084.0303

Cited by 25 publications

(36 citation statements)

References 12 publications

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“…Two of the 43 fish that passed Willamette Falls moved back over the falls. One of these two fish was undetected by our aerial surveys and moved back below the falls 2 days later; the other fish was detected by our surveys (Mesa et al 2010). We detected 24 of 43 fish (55.8% detection efficiency), including 22 fish in the mainstem Willamette and two in tributaries.…”

Section: Aerial Trackingmentioning

confidence: 62%

“…Most adult Pacific lamprey passed Bonneville Dam, the first dam encountered by these fish at river kilometer 223 on the Columbia River, at temperatures of 15-23°C (Keefer et al 2009). Similarly, peak passage of adult Pacific lamprey at Willamette Falls occurred during peak river temperatures of 23°C during 2005 (Mesa et al 2010). Lamprey that passed Willamette Falls may have done so to avoid warm temperatures, which is interesting in that fish appeared to show the opposite behavior upstream of Willamette Falls: many slowed or stopped migrating during times coinciding with peak river temperatures.…”

Section: Discussionmentioning

confidence: 88%

“…2) because we tagged fish that were a minimum of 11 cm in girth to insure there was sufficient space inside the body cavity to hold the radio tags. Additional details of fish capture and tagging can be found in Mesa et al (2010). We were not able to reliably and consistently sex the immature tagged fish, therefore we did not assess migration behavior in relation to sex.…”

Section: Study Areamentioning

confidence: 99%

“…Of the 136 lamprey that were tagged, 43 passed upstream of Willamette Falls (all via the fish ladder; Mesa et al 2010). Two of the 43 fish that passed Willamette Falls moved back over the falls.…”

Section: Aerial Trackingmentioning

confidence: 99%

“…The 12 m high falls (Stanford et al 2005) are comprised of basaltic bedrock and boulders, flanked by a hydroelectric dam and paper mill with a fish ladder on the west side of the river. The lamprey congregate at the falls before they attempt to ascend the falls or either pass via the fish ladder and continue their migration to spawning areas or they move back downstream without passing the falls (Mesa et al 2010).…”

Section: Introductionmentioning

confidence: 99%

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Pre-spawning migration of adult Pacific lamprey, Entosphenus tridentatus, in the Willamette River, Oregon, U.S.A.

et al. 2011

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We describe the migration distances and timing of the adult Pacific lamprey, Entosphenus tridentatus, in the Willamette River Basin (Oregon, U.S.A.). We conducted aerial surveys to track radiotagged fish upstream of a major waterfall and hydropower complex en route to spawning areas. We detected 24 out of the 43 fish that passed the waterfallhydropower complex. Of the detected fish, 17 were detected multiple times. Their maximum migration distance upstream in the mainstem Willamette approximated a normal distribution. The maximum distance migrated upstream did not significantly correlate with total body length (r=−0.186, P=0.385) or date that the fish passed Willamette Falls (r=−0.118, P= 0.582). Fish migrated primarily during the spring to early summer period before stopping during the summer, when peak river temperatures (≥20°C). However, at least three fish continued to migrate upstream after September. Behavior ranged from relatively slow migration, followed by holding; to rapid migration, followed by slow migration further up in the basin. This study provides a basis for informing more detailed research on Pacific lamprey in the future.

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Section: Aerial Trackingmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 88%

Section: Study Areamentioning

confidence: 99%

Section: Aerial Trackingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pre-spawning migration of adult Pacific lamprey, Entosphenus tridentatus, in the Willamette River, Oregon, U.S.A.

et al. 2011

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Passage Effectiveness at a Pool‐and‐Weir Fishway Designed to Accommodate Pacific Lampreys

Ackerman

Pyper²,

David

et al. 2019

N American J Fish Manag

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Providing passage at man‐made barriers is important to preserving migratory fish species. Fishways used to bypass barriers have historically been designed to provide passage for economically important species, with little regard given to nontarget species. Consequently, native fish species whose swimming behaviors are not well suited to these fishways have suffered from restricted access to habitat. For example, poor passage at dams has contributed to declines in populations of Pacific Lamprey Entosphenus tridentatus in the Columbia River basin. Pool‐and‐weir fishways typical of Columbia basin dams are well suited to salmonids but not to anguilliforms like the Pacific Lamprey. We evaluated the passage efficiency of Pacific Lampreys through a new pool‐and‐weir fishway at River Mill Dam on the Clackamas River, Oregon, that was designed to facilitate Pacific Lamprey passage. Rounded corners at the fishway entrances, flush‐mounted weir gates, chamfered corners on orifices and weir walls, and orifices flush with the floor were all included in the fishway design specifically for Pacific Lampreys. In 2013 and 2015, Pacific Lampreys were radio‐tagged and PIT‐tagged to assess passage success. Dam passage efficiency estimates ranged from 84% to 98%, roughly 10–50% higher than Pacific Lamprey passage efficiency estimates at other dams in the Pacific Northwest. The median passage time through the fishway was 0.87 d in 2013 and 0.71 d in 2015. The high passage efficiency of Pacific Lampreys at River Mill Dam is likely due to the design elements incorporated specifically for Pacific Lampreys. These features could inform future fishway designs and modifications at locations where Pacific Lamprey passage is a consideration.

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Rapid Migration and High Survival of Adult Pacific Lampreys in Reservoirs

Keefer

Noyes

Clabough

et al. 2020

N American J Fish Manag

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Dams and reservoirs present diverse hazards for riverine fishes, including slowed migration, reduced or blocked access to essential habitats, and direct and delayed mortality risks. Many of these hazards are evident for Pacific Lamprey Entosphenus tridentatus in the heavily dammed Columbia River basin, where the species’ distribution and abundance has sharply declined. In a 3‐year study, we used acoustic telemetry to investigate behavior and apparent survival of 784 adult Pacific Lampreys in Columbia River reservoirs and turbulent dam tailraces, two environments where previous monitoring efforts have been somewhat ineffectual. We released Pacific Lampreys upstream and downstream from Bonneville Dam to test whether Pacific Lamprey passage at one dam negatively affected upstream dam and reservoir passage metrics (i.e., delayed effects on migration rate or reach passage success) and whether upstream‐released groups migrated further than their downstream‐released counterparts. Overall, results showed that Pacific Lampreys migrated very rapidly (median rates = 50–62 km/d) in reservoir reaches and slowly (1–3 km/d) in reaches with tailraces or fishways. Pacific Lampreys also had much higher passage success in reservoir reaches (reach × year estimates = 0.93–0.99) than in reaches with tailraces or fishways (most estimates = 0.58–0.82). We found little statistical evidence for negative delayed effects of dam passage. Pacific Lampreys released in the Bonneville forebay were far more likely to pass upstream dams (~26–57%) than were those released in the Bonneville tailrace (~20–36%). We conclude that tailraces and fishways constrained the upstream distribution of adult Pacific Lampreys, that reservoirs were not associated with high mortality during active upstream migration, and that translocation past individual dams can increase the upstream migration distance of individuals and population distribution. Areas of continuing uncertainty include behavior and survival during overwintering (i.e., prespawn holding) and the potential delayed effects of tailrace and fishway passage on Pacific Lamprey fitness.

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Passage and Behavior of Radio-Tagged Adult Pacific Lampreys (Entosphenus tridentatus) at the Willamette Falls Project, Oregon

Cited by 25 publications

References 12 publications

Pre-spawning migration of adult Pacific lamprey, Entosphenus tridentatus, in the Willamette River, Oregon, U.S.A.

Pre-spawning migration of adult Pacific lamprey, Entosphenus tridentatus, in the Willamette River, Oregon, U.S.A.

Passage Effectiveness at a Pool‐and‐Weir Fishway Designed to Accommodate Pacific Lampreys

Rapid Migration and High Survival of Adult Pacific Lampreys in Reservoirs

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