Juvenile Salmon Migration Observations from the Hakai Institute Juvenile Salmon Program in the Discovery Islands in British Columbia, Canada in 2020

The Hakai Institute Juvenile Salmon Program has been monitoring juvenile salmon migrations in the Discovery Islands in British Columbia, Canada since 2015 with the specific purpose to understand how ocean conditions experienced by juvenile salmon during their early marine migration impact their growth, health, and ultimately survival. This report summarizes migration timing, purse-seine catch intensity and composition, fish length and weight, sea-louse loads, and ocean temperatures observed from six years of this research and monitoring program. Migration timing for sockeye, pink, and chum was not significantly different than respective time-series averages and occurred on May 23 for sockeye, June 17 for chum, and on June 20 for pink salmon. In order of highest to smallest catch proportion seines were dominated by juvenile pink, sockeye, and chum salmon. Catch intensity (our relative abundance measurement) for chum was the lowest on record in the time series, though sockeye and pink catch intensity were nearer their time-series averages. Mean annual fork length for sockeye, pink, and chum salmon were all within the time-series average range. The abundance of pre-adult and adult Caligus clemensi sea lice was relatively high on juvenile sockeye, pink, and chum salmon in 2020 compared to previous years. The salmonid-specialist sea louse, Lepeophtheirus salmonis, had relatively high abundance on pink and chum salmon but low abundance on sockeye. May–June 30 m depth integrated ocean temperature in the northern Strait of Georgia in 2020 was 0.79 °C warmer than average for the time series (2015–2020), and the warmest observed in this time series.

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Licence: Creative Commons Attribution 4.0

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Metadata Reference Date(s) November 19, 2021 (Publication)
November 19, 2021 (Revision)
Dataset Reference Date(s) May 15, 2020 (Creation)
February 01, 2021 (Publication)
Frequency of Update As Needed

Responsible Party 1
Name
Brett T. Johnson
Affiliation
Hakai Institute
Email
brett.johnson@hakai.org
Role
  • Custodian
  • Distributor
  • Owner
  • Principal Investigator
Responsible Party 2
Name
Brian P.V. Hunt
Affiliation
University of British Columbia
Email
b.hunt@oceans.ubc.ca
Role
  • Distributor
  • Owner
  • Principal Investigator
Responsible Party 3
Name
Julian C.L. Gan
Affiliation
Hakai Institute
Role
Author

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": [ [ [ -125.2, 49.94 ], [ -125.0, 50.31 ], [ -125.3, 50.54 ], [ -125.6, 50.44 ], [ -125.2, 49.94 ] ] ], "type": "Polygon" }
North Bounding Latitude 49.94
South Bounding Latitude 50.54
East Bounding Longitude -125.0
West Bounding Longitude -125.6
Temporal Extent
Begin
2020-05-15
End
2020-07-10
Vertical Extent
Min
0.0
Max
9.0
Default Locale English
Citation identifier
Code
10.21966/e5c1-c396