Retrospective analysis of marine growth and relationships to return rates of Penobscot River Atlantic salmon

Barajas, Miguel F.; Sheehan, Timothy F.; Haas-Castro, Ruth E.; Ellingson, Brandon; Mills, Katherine E.

doi:10.1139/cjfas-2021-0142

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i

Retrospective analysis of marine growth and relationships to return rates of Penobscot River Atlantic salmon

2022
By Barajas, Miguel F. ; Sheehan, Timothy F. ; Haas-Castro, Ruth E. ; ...
Source: Canadian Journal of Fisheries and Aquatic Sciences, 79(6), 863-874

[PDF-3.28 MB]

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Details:

Journal Title:

Canadian Journal of Fisheries and Aquatic Sciences
Personal Author:

Barajas, Miguel F. ; Sheehan, Timothy F. ; Haas-Castro, Ruth E. ; Ellingson, Brandon ; Mills, Katherine E.

Barajas, Miguel F. ; Sheehan, Timothy F. ; Haas-Castro, Ruth E. ; Ellingson, Brandon ; Mills, Katherine E. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; NEFSC (Northeast Fisheries Science Center) ; CINAR (Cooperative Institute for the North Atlantic Region) ; OAR (Oceanic and Atmospheric Research)

NMFS (National Marine Fisheries Service) ; NEFSC (Northeast Fisheries Science Center) ; CINAR (Cooperative Institute for the North Atlantic Region) ; OAR (Oceanic and Atmospheric Research) Less -
Description:

Beginning in the 1980s, return rates of Atlantic salmon (Salmo salar) to the Penobscot River, Maine, USA, declined and have persisted at low levels. This downturn coincided with similar declines in North American and European Atlantic salmon stocks and with changes in the Northwest Atlantic ecosystem. Previous studies investigated whether early marine growth explained the declines, but results varied, with decreased growth associated with declines in European stocks but not North American stocks. In this study, we evaluate whether growth over the entire marine stage is related to Atlantic salmon marine survival. We constructed a growth time series from scales of returned Penobscot River Atlantic salmon spanning periods of varying marine survival. We used analysis of variance (ANOVA) and post hoc tests to quantify seasonal growth increment differences and principal component analysis to characterize variability among the suite of growth increments. We observed reduced growth during the second winter and second marine year starting in the 1990s, with compensatory seasonal growth relationships. These results indicate that diminished growth during late marine stages is associated with low return rates in this population.
Keywords:

[+]

Analysis Of Variance Atlantic Salmon Fish Populations
Source:

Canadian Journal of Fisheries and Aquatic Sciences, 79(6), 863-874
DOI:

https://doi.org/10.1139/cjfas-2021-0142
Document Type:

Journal Article
Funding:

Grant no. NA14OAR4320158
Place as Subject:

Penobscot River (Me.)
License:

https://creativecommons.org/licenses/by/4.0/
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:d5318459aae1e04727971999e6556e8fc8f0aa54ddc993015803033ff0bc049c
Download URL:

https://repository.library.noaa.gov/view/noaa/46541/noaa_46541_DS1.pdf
File Type:

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