Hypoxia during incubation does not affect aerobic performance or haematology of Atlantic salmon (Salmo salar) when re-exposed in later life
Abstract Hypoxia in aquatic ecosystems is becoming increasingly prevalent, potentially reducing fish performance and survival by limiting the oxygen available for aerobic activities. Hypoxia is a challenge for conserving and managing fish populations and demands a better understanding of the short-...
Published in: | Conservation Physiology |
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Oxford University Press (OUP)
2019
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Online Access: | http://dx.doi.org/10.1093/conphys/coz088 http://academic.oup.com/conphys/article-pdf/7/1/coz088/31143239/coz088.pdf |
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croxfordunivpr:10.1093/conphys/coz088 2024-05-19T07:37:35+00:00 Hypoxia during incubation does not affect aerobic performance or haematology of Atlantic salmon (Salmo salar) when re-exposed in later life Wood, Andrew T Andrewartha, Sarah J Elliott, Nicholas G Frappell, Peter B Clark, Timothy D Cooke, Steven Salmon Enterprises of Tasmania Australian Government Research Training Program Scholarship Australian Research Council Australian Government 2019 http://dx.doi.org/10.1093/conphys/coz088 http://academic.oup.com/conphys/article-pdf/7/1/coz088/31143239/coz088.pdf en eng Oxford University Press (OUP) http://creativecommons.org/licenses/by/4.0/ Conservation Physiology volume 7, issue 1 ISSN 2051-1434 journal-article 2019 croxfordunivpr https://doi.org/10.1093/conphys/coz088 2024-04-25T07:58:58Z Abstract Hypoxia in aquatic ecosystems is becoming increasingly prevalent, potentially reducing fish performance and survival by limiting the oxygen available for aerobic activities. Hypoxia is a challenge for conserving and managing fish populations and demands a better understanding of the short- and long-term impacts of hypoxic environments on fish performance. Fish acclimate to hypoxia via a variety of short- and long-term physiological modifications in an attempt to maintain aerobic performance. In particular, hypoxia exposure during early development may result in enduring cardio-respiratory modifications that affect future hypoxia acclimation capacity, yet this possibility remains poorly investigated. We incubated Atlantic salmon (Salmo salar) in normoxia (~100% dissolved oxygen [DO, as percent air saturation]), moderate hypoxia (~63% DO) or cyclical hypoxia (100–25% DO daily) from fertilization until 113 days post-fertilization prior to rearing all groups in normoxia for a further 8 months. At ~11 months of age, subsets of each group were acclimated to hypoxia (50% DO) for up to 44 days prior to haematology, aerobic metabolic rate and hypoxia tolerance measurements. Hypoxia exposure during incubation (fertilization to 113 days post-fertilization) did not affect the haematology, aerobic performance or hypoxia tolerance of juvenile salmon in later life. Juveniles acclimated to hypoxia increased maximum aerobic metabolic rate and aerobic scope by ~23 and ~52%, respectively, when measured at 50% DO but not at 100% DO. Hypoxia-incubated juveniles also increased haematocrit and haemoglobin concentration but did not affect acute hypoxia tolerance (critical oxygen level and DO at LOE). Thus, while Atlantic salmon possess a considerable capacity to physiologically acclimate to hypoxia by improving aerobic performance in low oxygen conditions, we found no evidence that this capacity is influenced by early-life hypoxia exposure. Article in Journal/Newspaper Atlantic salmon Salmo salar Oxford University Press Conservation Physiology 7 1 |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
Abstract Hypoxia in aquatic ecosystems is becoming increasingly prevalent, potentially reducing fish performance and survival by limiting the oxygen available for aerobic activities. Hypoxia is a challenge for conserving and managing fish populations and demands a better understanding of the short- and long-term impacts of hypoxic environments on fish performance. Fish acclimate to hypoxia via a variety of short- and long-term physiological modifications in an attempt to maintain aerobic performance. In particular, hypoxia exposure during early development may result in enduring cardio-respiratory modifications that affect future hypoxia acclimation capacity, yet this possibility remains poorly investigated. We incubated Atlantic salmon (Salmo salar) in normoxia (~100% dissolved oxygen [DO, as percent air saturation]), moderate hypoxia (~63% DO) or cyclical hypoxia (100–25% DO daily) from fertilization until 113 days post-fertilization prior to rearing all groups in normoxia for a further 8 months. At ~11 months of age, subsets of each group were acclimated to hypoxia (50% DO) for up to 44 days prior to haematology, aerobic metabolic rate and hypoxia tolerance measurements. Hypoxia exposure during incubation (fertilization to 113 days post-fertilization) did not affect the haematology, aerobic performance or hypoxia tolerance of juvenile salmon in later life. Juveniles acclimated to hypoxia increased maximum aerobic metabolic rate and aerobic scope by ~23 and ~52%, respectively, when measured at 50% DO but not at 100% DO. Hypoxia-incubated juveniles also increased haematocrit and haemoglobin concentration but did not affect acute hypoxia tolerance (critical oxygen level and DO at LOE). Thus, while Atlantic salmon possess a considerable capacity to physiologically acclimate to hypoxia by improving aerobic performance in low oxygen conditions, we found no evidence that this capacity is influenced by early-life hypoxia exposure. |
author2 |
Cooke, Steven Salmon Enterprises of Tasmania Australian Government Research Training Program Scholarship Australian Research Council Australian Government |
format |
Article in Journal/Newspaper |
author |
Wood, Andrew T Andrewartha, Sarah J Elliott, Nicholas G Frappell, Peter B Clark, Timothy D |
spellingShingle |
Wood, Andrew T Andrewartha, Sarah J Elliott, Nicholas G Frappell, Peter B Clark, Timothy D Hypoxia during incubation does not affect aerobic performance or haematology of Atlantic salmon (Salmo salar) when re-exposed in later life |
author_facet |
Wood, Andrew T Andrewartha, Sarah J Elliott, Nicholas G Frappell, Peter B Clark, Timothy D |
author_sort |
Wood, Andrew T |
title |
Hypoxia during incubation does not affect aerobic performance or haematology of Atlantic salmon (Salmo salar) when re-exposed in later life |
title_short |
Hypoxia during incubation does not affect aerobic performance or haematology of Atlantic salmon (Salmo salar) when re-exposed in later life |
title_full |
Hypoxia during incubation does not affect aerobic performance or haematology of Atlantic salmon (Salmo salar) when re-exposed in later life |
title_fullStr |
Hypoxia during incubation does not affect aerobic performance or haematology of Atlantic salmon (Salmo salar) when re-exposed in later life |
title_full_unstemmed |
Hypoxia during incubation does not affect aerobic performance or haematology of Atlantic salmon (Salmo salar) when re-exposed in later life |
title_sort |
hypoxia during incubation does not affect aerobic performance or haematology of atlantic salmon (salmo salar) when re-exposed in later life |
publisher |
Oxford University Press (OUP) |
publishDate |
2019 |
url |
http://dx.doi.org/10.1093/conphys/coz088 http://academic.oup.com/conphys/article-pdf/7/1/coz088/31143239/coz088.pdf |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Conservation Physiology volume 7, issue 1 ISSN 2051-1434 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/conphys/coz088 |
container_title |
Conservation Physiology |
container_volume |
7 |
container_issue |
1 |
_version_ |
1799476912151592960 |