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Trends in Pacific Canadian groundfish stock status

View ORCID ProfileSean C. Anderson, Brendan M. Connors, Philina A. English, Robyn E. Forrest, Rowan Haigh, Kendra R. Holt
doi: https://doi.org/10.1101/2021.12.13.472502
Sean C. Anderson
1Pacific Biological Station, Fisheries and Oceans Canada, Nanaimo, BC, Canada
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  • For correspondence: sean.anderson@dfo-mpo.gc.ca
Brendan M. Connors
2Institute of Ocean Sciences, Fisheries and Oceans Canada, Sidney, BC, Canada
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Philina A. English
1Pacific Biological Station, Fisheries and Oceans Canada, Nanaimo, BC, Canada
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Robyn E. Forrest
1Pacific Biological Station, Fisheries and Oceans Canada, Nanaimo, BC, Canada
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Rowan Haigh
2Institute of Ocean Sciences, Fisheries and Oceans Canada, Sidney, BC, Canada
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Kendra R. Holt
2Institute of Ocean Sciences, Fisheries and Oceans Canada, Sidney, BC, Canada
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Abstract

We assembled estimated biomass (B) time series from stock assessments for 24 Pacific Canadian groundfish stocks and modelled average and stock status through 2020 based on biomass relative to each stock’s (1) Limit Reference Point (B/LRP), (2) Upper Stock Reference (B/USR), and (3) biomass at maximum sustainable yield (B/BMSY). The overall mean B/LRP in 2020 was 3.2 (95% credible interval [CI]: 2.6–3.9). The overall mean B/USR and B/BMSY in 2020 was 1.5 (95% CI: 1.3–1.9) and 1.4 (95% CI: 1.1–1.7), respectively. Average stock status declined from 1950 to around 2000 and has remained relatively stable since then. The change around 2000 followed the implementation of ITQs (individual transferable quotas) for the trawl fleet and the commencement of the synoptic trawl surveys. As of their last assessment, four stocks (Strait of Georgia Lingcod [Area 4B], coastwide Bocaccio, and inside and outside Quillback Rockfish) had a greater than 5% probability of being below their LRP (i.e., in the “ critical zone”); Pacific Cod in Area 3CD had a 4.6% probability. Roughly one-third of stocks had a greater than 1 in 4 chance of being below their USR (i.e., in the “ cautious zone”). Conversely, two-thirds of assessed groundfish stocks had a high (>75%) probability of being above the USR (i.e., in the “ healthy zone”).

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • Yelloweye Rockfish 4B and Yellowtail Rockfish BC references in Table 1 and some in-text citation formatting have been corrected.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted December 18, 2021.
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Trends in Pacific Canadian groundfish stock status
Sean C. Anderson, Brendan M. Connors, Philina A. English, Robyn E. Forrest, Rowan Haigh, Kendra R. Holt
bioRxiv 2021.12.13.472502; doi: https://doi.org/10.1101/2021.12.13.472502
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Trends in Pacific Canadian groundfish stock status
Sean C. Anderson, Brendan M. Connors, Philina A. English, Robyn E. Forrest, Rowan Haigh, Kendra R. Holt
bioRxiv 2021.12.13.472502; doi: https://doi.org/10.1101/2021.12.13.472502

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