Differential infestation of juvenile pacific salmon by parasitic sea lice in British Columbia, Canada

Cole B. Brookson; Martin Krkošek; Brian P.V. Hunt; Brett T. Johnson; Luke A. Rogers; Sean C. Godwin

doi:10.1139/cjfas-2020-0160

Differential infestation of juvenile pacific salmon by parasitic sea lice in British Columbia, Canada

Cole B. Brookson, Martin Krkošek, Brian P.V. Hunt, Brett T. Johnson, Luke A. Rogers, Sean C. Godwin

Medicine

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Fraser River Pacific salmon have declined in recent decades, possibly from parasitism by sea lice (Caligus clemensi and Lepeophtheirus salmonis). We describe the abundance of both louse species infesting co-migrating juvenile pink (Oncorhynchus gorbuscha), chum (Oncorhynchus keta), and sockeye (Oncorhynchus nerka) salmon over 5 years in the Discovery Islands and Johnstone Strait, British Columbia. The generalist louse, C. clemensi, was 5, 7, and 39 times more abundant than the salmonid specialist, L. salmonis, on pink, chum, and sockeye salmon, respectively. Caligus clemensi abundance was higher on pink salmon (0.45, 95% CI: 0.38–0.55) and sockeye (0.39, 95% CI: 0.33–0.47) than on chum salmon. Lepeophtheirus salmonis abundance was highest on pink salmon (0.09, 95% CI = 0.06–0.15). Caligus clemensi had higher abundances in Johnstone Strait than in the Discovery Islands. These results suggest differences in host specialization and transmission dynamics between louse species. Because both lice infest farmed salmon, but only C. clemensi infests Pacific herring (Clupea pallasii), conservation science and management regarding lice and Fraser River salmon should further consider C. clemensi and transmission from farmed salmon and wild herring.

Original language	English
Pages (from-to)	1960-1968
Number of pages	9
Journal	Canadian Journal of Fisheries and Aquatic Sciences
Volume	77
Issue number	12
DOIs	https://doi.org/10.1139/cjfas-2020-0160
Publication status	Published - 2020

Bibliographical note

Funding Information:
First and foremost, the authors thank the Hakai Institute for its tremendous support of the Juvenile Salmon Program. We are also grateful to Salmon Coast Field Station for its invaluable contributions to the Johnstone Strait portion of the field work. This work was funded by the Hakai Institute, an NSERC Post-Graduate Scholarship and a Liber Ero Postdoctoral Fellowship to SCG, a MITACS Accelerate Grant (No. IT09911) to BPVH, and an NSERC Discovery Grant and Canada Research Chair to MK. Thanks as well to Simon Fraser University, the University of Toronto, The University of British Columbia, and the many field and lab technicians that have assisted the Juvenile Salmon Program. We thank two anonymous reviewers for their feedback, which improved the paper.

Publisher Copyright:
© 2020, Canadian Science Publishing. All rights reserved.

ASJC Scopus Subject Areas

Ecology, Evolution, Behavior and Systematics
Aquatic Science

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10.1139/cjfas-2020-0160

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@article{bdc07572e8234472b1c19f25da80c758,

title = "Differential infestation of juvenile pacific salmon by parasitic sea lice in British Columbia, Canada",

abstract = "Fraser River Pacific salmon have declined in recent decades, possibly from parasitism by sea lice (Caligus clemensi and Lepeophtheirus salmonis). We describe the abundance of both louse species infesting co-migrating juvenile pink (Oncorhynchus gorbuscha), chum (Oncorhynchus keta), and sockeye (Oncorhynchus nerka) salmon over 5 years in the Discovery Islands and Johnstone Strait, British Columbia. The generalist louse, C. clemensi, was 5, 7, and 39 times more abundant than the salmonid specialist, L. salmonis, on pink, chum, and sockeye salmon, respectively. Caligus clemensi abundance was higher on pink salmon (0.45, 95% CI: 0.38–0.55) and sockeye (0.39, 95% CI: 0.33–0.47) than on chum salmon. Lepeophtheirus salmonis abundance was highest on pink salmon (0.09, 95% CI = 0.06–0.15). Caligus clemensi had higher abundances in Johnstone Strait than in the Discovery Islands. These results suggest differences in host specialization and transmission dynamics between louse species. Because both lice infest farmed salmon, but only C. clemensi infests Pacific herring (Clupea pallasii), conservation science and management regarding lice and Fraser River salmon should further consider C. clemensi and transmission from farmed salmon and wild herring.",

author = "Brookson, {Cole B.} and Martin Krko{\v s}ek and Hunt, {Brian P.V.} and Johnson, {Brett T.} and Rogers, {Luke A.} and Godwin, {Sean C.}",

note = "Funding Information: First and foremost, the authors thank the Hakai Institute for its tremendous support of the Juvenile Salmon Program. We are also grateful to Salmon Coast Field Station for its invaluable contributions to the Johnstone Strait portion of the field work. This work was funded by the Hakai Institute, an NSERC Post-Graduate Scholarship and a Liber Ero Postdoctoral Fellowship to SCG, a MITACS Accelerate Grant (No. IT09911) to BPVH, and an NSERC Discovery Grant and Canada Research Chair to MK. Thanks as well to Simon Fraser University, the University of Toronto, The University of British Columbia, and the many field and lab technicians that have assisted the Juvenile Salmon Program. We thank two anonymous reviewers for their feedback, which improved the paper. Publisher Copyright: {\textcopyright} 2020, Canadian Science Publishing. All rights reserved.",

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language = "English",

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T1 - Differential infestation of juvenile pacific salmon by parasitic sea lice in British Columbia, Canada

AU - Brookson, Cole B.

AU - Krkošek, Martin

AU - Hunt, Brian P.V.

AU - Johnson, Brett T.

AU - Rogers, Luke A.

AU - Godwin, Sean C.

N1 - Funding Information: First and foremost, the authors thank the Hakai Institute for its tremendous support of the Juvenile Salmon Program. We are also grateful to Salmon Coast Field Station for its invaluable contributions to the Johnstone Strait portion of the field work. This work was funded by the Hakai Institute, an NSERC Post-Graduate Scholarship and a Liber Ero Postdoctoral Fellowship to SCG, a MITACS Accelerate Grant (No. IT09911) to BPVH, and an NSERC Discovery Grant and Canada Research Chair to MK. Thanks as well to Simon Fraser University, the University of Toronto, The University of British Columbia, and the many field and lab technicians that have assisted the Juvenile Salmon Program. We thank two anonymous reviewers for their feedback, which improved the paper. Publisher Copyright: © 2020, Canadian Science Publishing. All rights reserved.

PY - 2020

Y1 - 2020

N2 - Fraser River Pacific salmon have declined in recent decades, possibly from parasitism by sea lice (Caligus clemensi and Lepeophtheirus salmonis). We describe the abundance of both louse species infesting co-migrating juvenile pink (Oncorhynchus gorbuscha), chum (Oncorhynchus keta), and sockeye (Oncorhynchus nerka) salmon over 5 years in the Discovery Islands and Johnstone Strait, British Columbia. The generalist louse, C. clemensi, was 5, 7, and 39 times more abundant than the salmonid specialist, L. salmonis, on pink, chum, and sockeye salmon, respectively. Caligus clemensi abundance was higher on pink salmon (0.45, 95% CI: 0.38–0.55) and sockeye (0.39, 95% CI: 0.33–0.47) than on chum salmon. Lepeophtheirus salmonis abundance was highest on pink salmon (0.09, 95% CI = 0.06–0.15). Caligus clemensi had higher abundances in Johnstone Strait than in the Discovery Islands. These results suggest differences in host specialization and transmission dynamics between louse species. Because both lice infest farmed salmon, but only C. clemensi infests Pacific herring (Clupea pallasii), conservation science and management regarding lice and Fraser River salmon should further consider C. clemensi and transmission from farmed salmon and wild herring.

AB - Fraser River Pacific salmon have declined in recent decades, possibly from parasitism by sea lice (Caligus clemensi and Lepeophtheirus salmonis). We describe the abundance of both louse species infesting co-migrating juvenile pink (Oncorhynchus gorbuscha), chum (Oncorhynchus keta), and sockeye (Oncorhynchus nerka) salmon over 5 years in the Discovery Islands and Johnstone Strait, British Columbia. The generalist louse, C. clemensi, was 5, 7, and 39 times more abundant than the salmonid specialist, L. salmonis, on pink, chum, and sockeye salmon, respectively. Caligus clemensi abundance was higher on pink salmon (0.45, 95% CI: 0.38–0.55) and sockeye (0.39, 95% CI: 0.33–0.47) than on chum salmon. Lepeophtheirus salmonis abundance was highest on pink salmon (0.09, 95% CI = 0.06–0.15). Caligus clemensi had higher abundances in Johnstone Strait than in the Discovery Islands. These results suggest differences in host specialization and transmission dynamics between louse species. Because both lice infest farmed salmon, but only C. clemensi infests Pacific herring (Clupea pallasii), conservation science and management regarding lice and Fraser River salmon should further consider C. clemensi and transmission from farmed salmon and wild herring.

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JF - Canadian Journal of Fisheries and Aquatic Sciences

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Differential infestation of juvenile pacific salmon by parasitic sea lice in British Columbia, Canada

Abstract

Bibliographical note

ASJC Scopus Subject Areas

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