Providing refuges for adult Pacific lamprey Entosphenus tridentatus inside fishways

Moser, Mary L.; Keefer, Matthew L.; Corbett, Stephen C.; Frick, Kinsey E.; Caudill, Christopher C.; Tackley, Sean C.

doi:10.1016/j.aaf.2019.03.003

Cited by 6 publications

(2 citation statements)

References 25 publications

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“…Morphological differences both among and within lamprey species have been linked to differences in behavior, which may affect ecological processes. For example, Pacific lamprey with a shorter distance between the first and second dorsal fins (that were closer to sexual maturity) were more likely to use refuges during passage at Bonneville Dam [ 47 ] and had lower passage success in an experimental vertical slot fishway [ 48 ]. The present study has identified marked differences between the two Geotria species, especially regarding growth of the oral disc.…”

Section: Discussionmentioning

confidence: 99%

Morphometric and physical characteristics distinguishing adult Patagonian lamprey, Geotria macrostoma from the pouched lamprey, Geotria australis

et al. 2021

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The pouched lamprey, Geotria australis Gray, 1851, has long been considered monotypic in the Geotriidae family with a wide southern temperate distribution across Australasia and South America. Recent studies have provided molecular and morphological evidence for a second Geotria species in South America; Geotria macrostoma (Burmeister, 1868). The aim of this study was to determine morphometric and physical characteristics of adult G. macrostoma that further differentiate this re-instated species of Geotriidae from G. australis. The diagnostic features discriminating immature adult G. macrostoma from G. australis when entering fresh water, are distinct differences in dentition, oral papillae and fimbriae counts and differences in coloration. In addition, G. macrostoma display greater growth of the prebranchial region and oral disc and has a deeper body depth and higher condition factor. All current ecological knowledge of the genus Geotria is based on Australasian populations, which may not be applicable to G. macrostoma. To ensure the conservation and protection of the Patagonian lamprey as a re-identified species, further investigations are needed to understand its life history, biology and ecology throughout its range.

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Section: Discussionmentioning

confidence: 99%

Morphometric and physical characteristics distinguishing adult Patagonian lamprey, Geotria macrostoma from the pouched lamprey, Geotria australis

et al. 2021

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“…Frequent Pacific Lamprey resting inside Bonneville fishways (Keefer et al. ; Moser et al., in press), or upon exiting fishways into dam forebays, may have effectively mitigated short‐term delayed effects on swim performance.…”

Section: Discussionmentioning

confidence: 99%

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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Distribution and abundance of the Patagonian lamprey (Geotria macrostoma) in the largest unfragmented river of southern Patagonia, Argentina

Quiroga,

Baker,

Baigún

et al. 2023

Environ Biol Fish

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Providing refuges for adult Pacific lamprey Entosphenus tridentatus inside fishways

Cited by 6 publications

References 25 publications

Morphometric and physical characteristics distinguishing adult Patagonian lamprey, Geotria macrostoma from the pouched lamprey, Geotria australis

Morphometric and physical characteristics distinguishing adult Patagonian lamprey, Geotria macrostoma from the pouched lamprey, Geotria australis

Rapid Migration and High Survival of Adult Pacific Lampreys in Reservoirs

Distribution and abundance of the Patagonian lamprey (Geotria macrostoma) in the largest unfragmented river of southern Patagonia, Argentina

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