Changes in growth and migration patterns of sea trout before and after the introduction of Atlantic salmon farming
Abstract Marine growth has strong implications for reproductive potential and ultimate fitness of sea trout. Hence, the effects of anthropogenic factors on marine growth are important when evaluating population responses and implementing management measures. Temporal changes in growth patterns of se...
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Oxford University Press (OUP)
2020
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsaa125 http://academic.oup.com/icesjms/article-pdf/77/7-8/2623/35589467/fsaa125.pdf |
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croxfordunivpr:10.1093/icesjms/fsaa125 2024-09-09T19:30:42+00:00 Changes in growth and migration patterns of sea trout before and after the introduction of Atlantic salmon farming Eldøy, Sindre Håvarstein Ryan, D Roche, W K Thorstad, E B Næsje, T F Sjursen, A D Gargan, P G Davidsen, J G Grabowski, Jonathan CHASES Research Council of Norway 2020 http://dx.doi.org/10.1093/icesjms/fsaa125 http://academic.oup.com/icesjms/article-pdf/77/7-8/2623/35589467/fsaa125.pdf en eng Oxford University Press (OUP) http://creativecommons.org/licenses/by/4.0/ ICES Journal of Marine Science volume 77, issue 7-8, page 2623-2634 ISSN 1095-9289 journal-article 2020 croxfordunivpr https://doi.org/10.1093/icesjms/fsaa125 2024-08-12T04:25:21Z Abstract Marine growth has strong implications for reproductive potential and ultimate fitness of sea trout. Hence, the effects of anthropogenic factors on marine growth are important when evaluating population responses and implementing management measures. Temporal changes in growth patterns of sea trout from three Norwegian and two Irish watercourses were examined, covering time spans of 25–65 years. Elemental chemistry Ba:Ca profiles and visual reading of fish scales were used to estimate smolt length and lifetime growth after first sea entry. Reduced growth after the first sea entry coincided with periods of nearby (<14 km) salmon-farming activity in impacted watersheds in both countries. Increased Ba:Ca levels were also recorded during these periods, likely indicating reduced residency in marine habitats caused by premature return to freshwater and estuaries. An increase in estimated length at first sea entry coinciding with salmon-farming activity, for groups of fish sampled after sea migration, suggests a size-selective marine mortality, with the smallest individuals experiencing a larger mortality. Article in Journal/Newspaper Atlantic salmon Oxford University Press ICES Journal of Marine Science 77 7-8 2623 2634 |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
Abstract Marine growth has strong implications for reproductive potential and ultimate fitness of sea trout. Hence, the effects of anthropogenic factors on marine growth are important when evaluating population responses and implementing management measures. Temporal changes in growth patterns of sea trout from three Norwegian and two Irish watercourses were examined, covering time spans of 25–65 years. Elemental chemistry Ba:Ca profiles and visual reading of fish scales were used to estimate smolt length and lifetime growth after first sea entry. Reduced growth after the first sea entry coincided with periods of nearby (<14 km) salmon-farming activity in impacted watersheds in both countries. Increased Ba:Ca levels were also recorded during these periods, likely indicating reduced residency in marine habitats caused by premature return to freshwater and estuaries. An increase in estimated length at first sea entry coinciding with salmon-farming activity, for groups of fish sampled after sea migration, suggests a size-selective marine mortality, with the smallest individuals experiencing a larger mortality. |
author2 |
Grabowski, Jonathan CHASES Research Council of Norway |
format |
Article in Journal/Newspaper |
author |
Eldøy, Sindre Håvarstein Ryan, D Roche, W K Thorstad, E B Næsje, T F Sjursen, A D Gargan, P G Davidsen, J G |
spellingShingle |
Eldøy, Sindre Håvarstein Ryan, D Roche, W K Thorstad, E B Næsje, T F Sjursen, A D Gargan, P G Davidsen, J G Changes in growth and migration patterns of sea trout before and after the introduction of Atlantic salmon farming |
author_facet |
Eldøy, Sindre Håvarstein Ryan, D Roche, W K Thorstad, E B Næsje, T F Sjursen, A D Gargan, P G Davidsen, J G |
author_sort |
Eldøy, Sindre Håvarstein |
title |
Changes in growth and migration patterns of sea trout before and after the introduction of Atlantic salmon farming |
title_short |
Changes in growth and migration patterns of sea trout before and after the introduction of Atlantic salmon farming |
title_full |
Changes in growth and migration patterns of sea trout before and after the introduction of Atlantic salmon farming |
title_fullStr |
Changes in growth and migration patterns of sea trout before and after the introduction of Atlantic salmon farming |
title_full_unstemmed |
Changes in growth and migration patterns of sea trout before and after the introduction of Atlantic salmon farming |
title_sort |
changes in growth and migration patterns of sea trout before and after the introduction of atlantic salmon farming |
publisher |
Oxford University Press (OUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1093/icesjms/fsaa125 http://academic.oup.com/icesjms/article-pdf/77/7-8/2623/35589467/fsaa125.pdf |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
ICES Journal of Marine Science volume 77, issue 7-8, page 2623-2634 ISSN 1095-9289 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/icesjms/fsaa125 |
container_title |
ICES Journal of Marine Science |
container_volume |
77 |
container_issue |
7-8 |
container_start_page |
2623 |
op_container_end_page |
2634 |
_version_ |
1809899678722949120 |