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Please use this identifier to cite or link to this item: http://hdl.handle.net/10023/2603
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Title: The influence of the freshwater environment and the biological characteristics of Atlantic salmon smolts on their subsequent marine survival
Authors: Russell, Ian
Aprahamian, Miran
Barry, Jon
Davidson, Ian
Fiske, Peder
Ibbotson, Anton
Kennedy, Richard
Maclean, Julian
Moore, Andrew
Otero, Jaime
Potter, Ted
Todd, Christopher David
Keywords: Atlantic salmon
Biological characteristics
Climate change
Freshwater
Marine survival
Smolts
QH301 Biology
Issue Date: 2012
Citation: Russell , I , Aprahamian , M , Barry , J , Davidson , I , Fiske , P , Ibbotson , A , Kennedy , R , Maclean , J , Moore , A , Otero , J , Potter , T & Todd , C D 2012 , ' The influence of the freshwater environment and the biological characteristics of Atlantic salmon smolts on their subsequent marine survival ' ICES Journal of Marine Science , vol 69 , no. 9 , pp. 1563-1573 .
Abstract: Atlantic salmon have declined markedly in the past 20-30 years throughout their range. Much of the focus for this decline has been on increased mortality during the marine phase of the life cycle. However, marine mortality does not operate independently of factors acting in freshwater and the biological characteristics of smolts migrating to sea. Over recent decades, juvenile salmon in many rivers have grown faster and migrated to sea at a younger age, and thus typically smaller. This has shortened the generation time for many individuals, and may dampen the impact of increased marine mortality, assuming expected higher in-river survival prior to smolting is not outweighed by increased mortality of smaller smolts at sea. Over the same period, smolt run-timing across the geographic range has been occurring earlier, at a rate of almost three days per decade, on average. This has given rise to growing concerns about smolts potentially missing the optimum environmental migration “window”, the timing of which may also be changing. Contaminants and other factors operating in freshwater also impact on smolt quality with adverse consequences for their physiological readiness for life at sea. Given that managers have very limited ability to influence the broad scale factors limiting salmon survival at sea, it is vital that freshwater habitats are managed to both maximise smolt output and to minimise the impact of factors acting in freshwater which may compromise salmon once they migrate to sea.
Version: Publisher PDF
Status: Peer reviewed
URI: http://hdl.handle.net/10023/2603
DOI: http://dx.doi.org/10.1093/icesjms/fsr208
ISSN: 1054-3139
Type: Journal article
Rights: (c) Crown copyright 2012, available under the terms of the Open Government Licence (http://www.nationalarchives.gov.uk/doc/open-government-licence/)
Appears in Collections:University of St Andrews Research
Biology Research
Scottish Oceans Institute Research



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