Skip to main content

Tracking anadromous fish over successive freshwater migrations reveals the influence of tagging effect, previous success and abiotic factors on upstream passage over barriers.

Davies, P., Britton, J. R., Castro-Santos, T., Crundwell, C., Dodd, J. R., Nunn, A. D., Velterop, R. and Bolland, J. D., 2023. Tracking anadromous fish over successive freshwater migrations reveals the influence of tagging effect, previous success and abiotic factors on upstream passage over barriers. Canadian Journal of Fisheries and Aquatic Sciences, 80 (7), 1110-1125.

Full text available as:

[img]
Preview
PDF
CJFAS_shad_revision.pdf - Accepted Version
Available under License Creative Commons Attribution Non-commercial.

1MB

DOI: 10.1139/cjfas-2022-0196

Abstract

Predicting and mitigating the impact of anthropogenic barriers on migratory fish requires an understanding of the individual and environmental factors that influence barrier passage. Here, the upstream spawning migrations of iteroparous twaite shad Alosa fallax were investigated over three successive spawning migrations in a highly fragmented river basin using passive acoustic telemetry (n=184). More fish approached and passed barriers in the lower river reaches than further upstream, with the median cumulative weir passage time (IQR) of 4.6 (1.8 - 9.2) days representing 18% of their time in river. Returning fish in their second year had significantly higher weir passage rates than in their tagging year, with passage rates also positively influenced by previous passage success. Higher water temperature and river level also had positive impacts on passage rates. Lower weir passage rates by newly tagged individuals suggests that reliance on within-year passage estimates in telemetry-based barrier impact assessments could result in conservative results, while higher passage rates of previously successful versus unsuccessful individuals suggests a conserved motivation and/or inherent ability to pass barriers.

Item Type:Article
ISSN:0706-652X
Group:Faculty of Science & Technology
ID Code:38512
Deposited By: Symplectic RT2
Deposited On:18 May 2023 14:25
Last Modified:24 May 2024 09:31

Downloads

Downloads per month over past year

More statistics for this item...
Repository Staff Only -