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Developmental hypoxia has negligible effects on long-term hypoxia tolerance and aerobic metabolism of Atlantic salmon (Salmo salar)

Citation

Wood, AT and Clark, TD and Andrewartha, SJ and Elliott, NG and Frappell, PB, Developmental hypoxia has negligible effects on long-term hypoxia tolerance and aerobic metabolism of Atlantic salmon (Salmo salar), Physiological and Biochemical Zoology, 90, (4) pp. 494-501. ISSN 1522-2152 (2017) [Refereed Article]


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Copyright 2017 The University of Chicago. All rights reserved.

DOI: doi:10.1086/692250

Abstract

Exposure to developmental hypoxia can have long-term impacts on the physiological performance of fish because of irreversible plasticity. Wild and captive-reared Atlantic salmon (Salmo salar) can be exposed to hypoxic conditions during development and continue to experience fluctuating oxygen levels as juveniles and adults. Here, we examine whether developmental hypoxia impacts subsequent hypoxia tolerance and aerobic performance of Atlantic salmon. Individuals at 8C were exposed to 50% (hypoxia) or 100% (normoxia) dissolved oxygen (DO) saturation (as percent of air saturation) from fertilization for ∼100 d (800 degree days) and then raised in normoxic conditions for a further 15 mo. At 18 mo after fertilization, aerobic scope was calculated in normoxia (100% DO) and acute (18 h) hypoxia (50% DO) from the difference between the minimum and maximum oxygen consumption rates ( and , respectively) at 10C. Hypoxia tolerance was determined as the DO at which loss of equilibrium (LOE) occurred in a constantly decreasing DO environment. There was no difference in , , or aerobic scope between fish raised in hypoxia or normoxia. There was some evidence that hypoxia tolerance was lower (higher DO at LOE) in hypoxia-raised fish compared with those raised in normoxia, but the magnitude of the effect was small (12.52% DO vs. 11.73% DO at LOE). Acute hypoxia significantly reduced aerobic scope by reducing , while remained unchanged. Interestingly, acute hypoxia uncovered individual-level relationships between DO at LOE and , , and aerobic scope. We discuss our findings in the context of developmental trajectories and the role of aerobic performance in hypoxia tolerance.

Item Details

Item Type:Refereed Article
Keywords:aquaculture, hypoxia
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal Physiological Ecology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Coastal and Estuarine Flora, Fauna and Biodiversity
Author:Wood, AT (Mr Andrew Wood)
Author:Clark, TD (Dr Timothy Clark)
Author:Andrewartha, SJ (Dr Sarah Andrewartha)
Author:Frappell, PB (Professor Peter Frappell)
ID Code:116100
Year Published:2017
Deposited By:Centre for Fisheries and Aquaculture
Deposited On:2017-05-01
Last Modified:2017-07-10
Downloads:0

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