Aarestrup, Kim

Johnsson, Jörgen I

Larsen, Martin Hage

Näslund, Joacim

Thomassen, Søren T

The overall aim of this study was to investigate the effect of rearing density on the post-release survival of Atlantic salmon (Salmo salar) smolts during seaward migration. Fish were either reared at conventional hatchery density or at one-third of conventional density. Three hundred one-year old smolts from each density treatment were individually tagged with passive integrated transponder (PIT) tags and released 3.2 km upstream of a stationary antenna array in a natural stream. There were no significant differences in length, body mass, or condition between fish from the two density treatments during rearing in the hatchery. However, individuals reared at reduced density had less eroded dorsal fins and opercula relative to those from the high-density treatment. In the stream, the downstream migration success was 16% higher for fish reared at reduced density than for conspecifics kept at high-density, but the timing of migration was similar for both groups. These novel results suggest that conventionally high rearing densities may reduce welfare and the post-release migration success of hatchery-reared Atlantic salmo

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Reduced rearing density increases postrelease migration success of Atlantic salmon(Salmo salar) smolts - DTU Orbit (08/11/2017) Reduced rearing density increases postrelease migration success of Atlantic salmon (Salmo salar) smoltsThe overall aim of this study was to investigate the effect of rearing density on the post-release survival of Atlantic salmon(Salmo salar) smolts during seaward migration. Fish were either reared at conventional hatchery density or at one-third ofconventional density. Three hundred one-year old smolts from each density treatment were individually tagged withpassive integrated transponder (PIT) tags and released 3.2 km upstream of a stationary antenna array in a natural stream.There were no significant differences in length, body mass, or condition between fish from the two density treatmentsduring rearing in the hatchery. However, individuals reared at reduced density had less eroded dorsal fins and opercularelative to those from the high-density treatment. In the stream, the downstream migration success was 16% higher forfish reared at reduced density than for conspecifics kept at high-density, but the timing of migration was similar for bothgroups. These novel results suggest that conventionally high rearing densities may reduce welfare and the post-releasemigration success of hatchery-reared Atlantic salmon General informationState: PublishedOrganisations: National Institute of Aquatic Resources, Section for Freshwater Fisheries Ecology, University ofGothenburg, Danish Center for Wild SalmonAuthors: Larsen, M. H. (Intern), Johnsson, J. I. (Ekstern), Näslund, J. (Ekstern), Thomassen, S. T. (Ekstern), Aarestrup, K.(Intern)Pages: 804-810Publication date: 2016Main Research Area: Technical/natural sciences Publication informationJournal: Canadian Journal of Fisheries and Aquatic SciencesVolume: 73Issue number: 5ISSN (Print): 0706-652XRatings: BFI (2017): BFI-level 2 Web of Science (2017): Indexed yes BFI (2016): BFI-level 2 Scopus rating (2016): CiteScore 2.56 SJR 1.322 SNIP 1.163 Web of Science (2016): Indexed yes BFI (2015): BFI-level 2 Scopus rating (2015): SJR 1.256 SNIP 1.051 CiteScore 2.22 Web of Science (2015): Indexed yes BFI (2014): BFI-level 2 Scopus rating (2014): SJR 1.443 SNIP 1.379 CiteScore 2.6 Web of Science (2014): Indexed yes BFI (2013): BFI-level 2 Scopus rating (2013): SJR 1.421 SNIP 1.081 CiteScore 2.25 ISI indexed (2013): ISI indexed yes Web of Science (2013): Indexed yes BFI (2012): BFI-level 2 Scopus rating (2012): SJR 1.324 SNIP 1.196 CiteScore 2.29 ISI indexed (2012): ISI indexed yes Web of Science (2012): Indexed yes BFI (2011): BFI-level 2 Scopus rating (2011): SJR 1.423 SNIP 1.09 CiteScore 2.13 ISI indexed (2011): ISI indexed yes Web of Science (2011): Indexed yes BFI (2010): BFI-level 2 Scopus rating (2010): SJR 1.425 SNIP 1.118 Web of Science (2010): Indexed yes BFI (2009): BFI-level 2 Scopus rating (2009): SJR 1.451 SNIP 1.196 Web of Science (2009): Indexed yes BFI (2008): BFI-level 2 Scopus rating (2008): SJR 1.589 SNIP 1.379 Web of Science (2008): Indexed yes Scopus rating (2007): SJR 1.621 SNIP 1.236 Web of Science (2007): Indexed yes Scopus rating (2006): SJR 1.354 SNIP 1.267 Web of Science (2006): Indexed yes Scopus rating (2005): SJR 1.558 SNIP 1.553 Web of Science (2005): Indexed yes Scopus rating (2004): SJR 1.744 SNIP 1.542 Web of Science (2004): Indexed yes Scopus rating (2003): SJR 2.097 SNIP 1.622 Scopus rating (2002): SJR 1.909 SNIP 1.457 Web of Science (2002): Indexed yes Scopus rating (2001): SJR 1.769 SNIP 1.46 Web of Science (2001): Indexed yes Scopus rating (2000): SJR 1.5 SNIP 1.464 Web of Science (2000): Indexed yes Scopus rating (1999): SJR 1.928 SNIP 1.436 Original language: EnglishDOIs: 10.1139/cjfas-2014-0563 Source: FindItSource-ID: 2287636469Publication: Research - peer-review › Journal article – Annual report year: 2015 

Reduced rearing density increases postrelease migration success of Atlantic salmon (Salmo salar) smolts

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Reduced rearing density increases postrelease migration success of Atlantic salmon (Salmo salar) smolts

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