Empirical analyses of the length, weight, and condition of adult Atlantic salmon on return to the Scottish coast between 1963 and 2006

P.J. Bacon, S.C.F. Palmer, J.C. MacLean, G.W. Smith, B.D.M. Whyte, W.S.C. Gurney, A.F. Youngson, Atlantic Salmon Trust (Funder), EU FinE (Funder)

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Sea age, size, and condition of adult Atlantic salmon (Salmo salar) are prime determinants of individual, and hence population, productivity. To elucidate potential mechanisms, 151 000 records of salmon returning to six Scottish coastal sites over 44 years were analysedfor length, weight, and condition, by site, sex, sea age, and river age. After correcting for capture effort biases, all sites showed seasonal increases in length and weight for both 1 sea winter (1SW) and 2SW fish. However, whereas condition increased slightly with season for 2SW, it decreased notably for 1SW. Sites showed common decadal trends in length, weight, and condition. Within years, length and weight residuals from trends were coherent across sites, but residuals from condition trends were not. Rates of seasonal condition change also showed decadal trends, dramatically different between sea ages, but common across sites within sea-age groups. Longer salmon were disproportionately heavy in all seasons. 1SW condition was markedly lower in 2006. Detrended correlations withoceanic environmental variables were generally not significant, and always weak. A published correlation between the condition of 1SW salmon caught at a single site and sea surface temperatures in the Northeast Atlantic could not be substantiated for any of the six fisheries over the wider time-scales examined.
LanguageEnglish
Pages844-859
Number of pages15
JournalICES Journal of Marine Science
Volume66
Issue number5
DOIs
Publication statusPublished - 17 Apr 2009

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Salmo salar
coasts
coast
salmon
winter
surface temperature
fisheries
sea
environmental factors
rivers
gender
fish
sea surface temperature
fishery
timescale
productivity
trend
river

Keywords

  • climate change
  • condition
  • marine environment
  • NAO
  • Salmo salar
  • sea surface temperature

Cite this

Bacon, P.J. ; Palmer, S.C.F. ; MacLean, J.C. ; Smith, G.W. ; Whyte, B.D.M. ; Gurney, W.S.C. ; Youngson, A.F. ; Atlantic Salmon Trust (Funder) ; EU FinE (Funder). / Empirical analyses of the length, weight, and condition of adult Atlantic salmon on return to the Scottish coast between 1963 and 2006. In: ICES Journal of Marine Science. 2009 ; Vol. 66, No. 5. pp. 844-859.
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Bacon, PJ, Palmer, SCF, MacLean, JC, Smith, GW, Whyte, BDM, Gurney, WSC, Youngson, AF, Atlantic Salmon Trust (Funder) & EU FinE (Funder) 2009, 'Empirical analyses of the length, weight, and condition of adult Atlantic salmon on return to the Scottish coast between 1963 and 2006' ICES Journal of Marine Science, vol. 66, no. 5, pp. 844-859. https://doi.org/10.1093/icesjms/fsp096

Empirical analyses of the length, weight, and condition of adult Atlantic salmon on return to the Scottish coast between 1963 and 2006. / Bacon, P.J.; Palmer, S.C.F.; MacLean, J.C.; Smith, G.W.; Whyte, B.D.M.; Gurney, W.S.C.; Youngson, A.F.; Atlantic Salmon Trust (Funder); EU FinE (Funder).

In: ICES Journal of Marine Science, Vol. 66, No. 5, 17.04.2009, p. 844-859.

Research output: Contribution to journalArticle

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AU - Bacon, P.J.

AU - Palmer, S.C.F.

AU - MacLean, J.C.

AU - Smith, G.W.

AU - Whyte, B.D.M.

AU - Gurney, W.S.C.

AU - Youngson, A.F.

AU - Atlantic Salmon Trust (Funder)

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AB - Sea age, size, and condition of adult Atlantic salmon (Salmo salar) are prime determinants of individual, and hence population, productivity. To elucidate potential mechanisms, 151 000 records of salmon returning to six Scottish coastal sites over 44 years were analysedfor length, weight, and condition, by site, sex, sea age, and river age. After correcting for capture effort biases, all sites showed seasonal increases in length and weight for both 1 sea winter (1SW) and 2SW fish. However, whereas condition increased slightly with season for 2SW, it decreased notably for 1SW. Sites showed common decadal trends in length, weight, and condition. Within years, length and weight residuals from trends were coherent across sites, but residuals from condition trends were not. Rates of seasonal condition change also showed decadal trends, dramatically different between sea ages, but common across sites within sea-age groups. Longer salmon were disproportionately heavy in all seasons. 1SW condition was markedly lower in 2006. Detrended correlations withoceanic environmental variables were generally not significant, and always weak. A published correlation between the condition of 1SW salmon caught at a single site and sea surface temperatures in the Northeast Atlantic could not be substantiated for any of the six fisheries over the wider time-scales examined.

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