Can structural enrichment reduce predation mortality and increase recaptures of hatchery‐reared Atlantic salmon Salmo salar L. fry released into the wild?
Abstract Captive‐reared fish often have poor survival in the wild and may fail to boost threatened populations. Enrichment during the nursery period can in some circumstances generate a broader behavioural repertoire than conventional hatchery production. Yet, we do not know if enrichment promotes s...
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Online Access: | http://dx.doi.org/10.1111/jfb.14004 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfb.14004 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.14004 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jfb.14004 |
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crwiley:10.1111/jfb.14004 2024-04-14T08:09:13+00:00 Can structural enrichment reduce predation mortality and increase recaptures of hatchery‐reared Atlantic salmon Salmo salar L. fry released into the wild? Solås, Martine R. Skoglund, Helge Salvanes, Anne G. V. 2019 http://dx.doi.org/10.1111/jfb.14004 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfb.14004 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.14004 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jfb.14004 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 95, issue 2, page 575-588 ISSN 0022-1112 1095-8649 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2019 crwiley https://doi.org/10.1111/jfb.14004 2024-03-19T10:52:11Z Abstract Captive‐reared fish often have poor survival in the wild and may fail to boost threatened populations. Enrichment during the nursery period can in some circumstances generate a broader behavioural repertoire than conventional hatchery production. Yet, we do not know if enrichment promotes survival after release into the wild. We conducted a field experiment during three field seasons using age 0+ year Atlantic salmon Salmo salar to investigate if enrichment during rearing, in the form of structural complexity (shelters), reduced immediate (within 2 days after release) predation mortality by piscine predators (brown trout Salmo trutta ) and if such rearing environments improved long‐term (2–3 months after release) post ‐ release survival. In addition, we investigated if predation mortality of released fry was size‐selective. S. salar fry were reared in a structurally enriched environment or in a conventional rearing environment and given otolith marks using alizarin during the egg stage to distinguish between enriched and conventionally‐reared fry. The outcome from the field experiments showed that structural enrichment did not consistently reduce immediate predation mortality and it did not improve, or had a negative effect on, the recapture rate of fry from the river 2–3 months after release. The data also showed that enriched rearing tended to reduce growth. Additionally, we found that S. trutta predators fed on small individuals of the released fry. Overall, the data suggest that structural enrichment alone is not sufficient to improve long‐term survival of hatchery‐reared fish after release and that other factors might affect post ‐ release survival. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Journal of Fish Biology 95 2 575 588 |
institution |
Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Solås, Martine R. Skoglund, Helge Salvanes, Anne G. V. Can structural enrichment reduce predation mortality and increase recaptures of hatchery‐reared Atlantic salmon Salmo salar L. fry released into the wild? |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Abstract Captive‐reared fish often have poor survival in the wild and may fail to boost threatened populations. Enrichment during the nursery period can in some circumstances generate a broader behavioural repertoire than conventional hatchery production. Yet, we do not know if enrichment promotes survival after release into the wild. We conducted a field experiment during three field seasons using age 0+ year Atlantic salmon Salmo salar to investigate if enrichment during rearing, in the form of structural complexity (shelters), reduced immediate (within 2 days after release) predation mortality by piscine predators (brown trout Salmo trutta ) and if such rearing environments improved long‐term (2–3 months after release) post ‐ release survival. In addition, we investigated if predation mortality of released fry was size‐selective. S. salar fry were reared in a structurally enriched environment or in a conventional rearing environment and given otolith marks using alizarin during the egg stage to distinguish between enriched and conventionally‐reared fry. The outcome from the field experiments showed that structural enrichment did not consistently reduce immediate predation mortality and it did not improve, or had a negative effect on, the recapture rate of fry from the river 2–3 months after release. The data also showed that enriched rearing tended to reduce growth. Additionally, we found that S. trutta predators fed on small individuals of the released fry. Overall, the data suggest that structural enrichment alone is not sufficient to improve long‐term survival of hatchery‐reared fish after release and that other factors might affect post ‐ release survival. |
format |
Article in Journal/Newspaper |
author |
Solås, Martine R. Skoglund, Helge Salvanes, Anne G. V. |
author_facet |
Solås, Martine R. Skoglund, Helge Salvanes, Anne G. V. |
author_sort |
Solås, Martine R. |
title |
Can structural enrichment reduce predation mortality and increase recaptures of hatchery‐reared Atlantic salmon Salmo salar L. fry released into the wild? |
title_short |
Can structural enrichment reduce predation mortality and increase recaptures of hatchery‐reared Atlantic salmon Salmo salar L. fry released into the wild? |
title_full |
Can structural enrichment reduce predation mortality and increase recaptures of hatchery‐reared Atlantic salmon Salmo salar L. fry released into the wild? |
title_fullStr |
Can structural enrichment reduce predation mortality and increase recaptures of hatchery‐reared Atlantic salmon Salmo salar L. fry released into the wild? |
title_full_unstemmed |
Can structural enrichment reduce predation mortality and increase recaptures of hatchery‐reared Atlantic salmon Salmo salar L. fry released into the wild? |
title_sort |
can structural enrichment reduce predation mortality and increase recaptures of hatchery‐reared atlantic salmon salmo salar l. fry released into the wild? |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1111/jfb.14004 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfb.14004 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.14004 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jfb.14004 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Journal of Fish Biology volume 95, issue 2, page 575-588 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/jfb.14004 |
container_title |
Journal of Fish Biology |
container_volume |
95 |
container_issue |
2 |
container_start_page |
575 |
op_container_end_page |
588 |
_version_ |
1796306684552937472 |