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

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 (O. keta), and sockeye (O. nerka) salmon over five 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 pinks (0.45, 95% CI: 0.38-0.55) and sockeye (0.39 95% CI 32 0.33-0.47) than chum. L. salmonis abundance was highest on pinks (0.09, 95% CI = 0.06-0.15). Caligus clemensi had higher abundances in Johnstone Strait than 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.

Access and Use

Licence: Creative Commons Attribution 4.0

Data and Resources

Citation

Keywords

Dataset extent

Map data © OpenStreetMap contributors

Metadata Reference Date(s) September 28, 2021 (Publication)
September 28, 2021 (Revision)
Dataset Reference Date(s) September 04, 2020 (Publication)
Frequency of Update As Needed

Responsible Party 1
Name
Cole Brookson
Affiliation
University of Alberta
Email
brookson@ualberta.ca
Role
  • Author
  • Point of Contact
Responsible Party 2
Name
Martin Krkosek
Affiliation
University of Toronto
Email
martin.krkosek@utoronto.ca
Role
  • Point of Contact
  • Principal Investigator
Responsible Party 3
Name
Brian Hunt
Affiliation
University of British Columbia
Email
b.hunt@oceans.ubc.ca
Role
Author
Responsible Party 4
Name
Brett Johnson
Affiliation
Hakai Institute
Email
brett.johnson@hakai.org
Role
  • Author
  • Custodian
  • Distributor
  • Owner
Responsible Party 5
Name
Luke Rogers
Affiliation
Fisheries and Oceans Canada
Role
Author
Responsible Party 6
Name
Sean Godwin
Affiliation
Dalhousie University
Email
sean.godwin@gmail.com
Role
  • Point of Contact
  • Principal Investigator

Field Value
Ocean Variables Other
Scope Dataset
Status On Going
Topic Category oceans
Maintenance Note Generated from https://cioos-siooc.github.io/metadata-entry-form
Spatial Extent { "coordinates": [ [ [ -126.87477074, 49.80151064 ], [ -124.30109865, 49.80151064 ], [ -124.30109865, 50.66883255 ], [ -126.87477074, 50.66883255 ], [ -126.87477074, 49.80151064 ] ] ], "type": "Polygon" }
North Bounding Latitude 50.66883255
South Bounding Latitude 49.80151064
East Bounding Longitude -124.30109865
West Bounding Longitude -126.87477074
Vertical Extent
Min
0.0
Max
9.0
Default Locale English
Citation identifier
Code
10.5281/zenodo.4005400