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Acute but not chronic hyperoxia increases metabolic rate without altering the cardiorespiratory response in Atlantic salmon alevins

Citation

Polymeropoulos, ET and Elliott, NG and Frappell, PB, Acute but not chronic hyperoxia increases metabolic rate without altering the cardiorespiratory response in Atlantic salmon alevins, Aquaculture, 502 pp. 189-195. ISSN 0044-8486 (2019) [Refereed Article]

Copyright Statement

Copright 2018 Elsevier B.V.

DOI: doi:10.1016/j.aquaculture.2018.12.041

Abstract

Hyperoxia has been shown to affect growth, survival and cellular homeostasis in fish. Previous findings on chronic hypoxia (low environmental O2) exposure in Atlantic salmon alevins indicate that re-exposure to normoxic conditions after hypoxia exposure (relative hyperoxia) elevates metabolism above normal. Hence, we here investigated whether acute hyperoxia above normoxic conditions also alters O2) uptake and whether chronic hyperoxia affects O2) uptake under normoxic and hypoxic conditions. To this end, the effects of acute and chronic hyperoxia exposure on metabolic rate and cardiorespiratory function (heart rate and ventilation rate) in Atlantic salmon (Salmo salar) alevins incubated at 4 C were investigated, and how it is affected by an increase in ambient temperature (4 C and 8 C).

Hyperoxia (1518 days at 28 kPa) reared alevins display advanced development compared with normoxia incubated animals. While acute hypoxia generally leads to metabolic depression (≈70%, 21 kPa compared with 5 kPa), acute hyperoxia (28 kPa) causes hypermetabolism (≈30% compared with normoxia at 4 C and ≈20% at 8 C). Chronic hyperoxic rearing on the other hand did not alter metabolic rate at 4 C or 8 C in acute hyperoxia, normoxia or hypoxia. Heart rates and ventilation rates were also unaltered with acute hyperoxia and were unaffected by chronic hyperoxia exposure. It is shown that acute hyperoxia increases O2) uptake above normoxic conditions but chronic hyperoxia does not result in long term physiological changes. This adds further proof that O2) uptake is not limited by O2) transport capacity but by O2) availability at this developmental stage in salmonids.

Item Details

Item Type:Refereed Article
Keywords:salmon aquaculture, Atlantic salmon, hyperoxia, temperature, acclimation, cardiorespiratory function
Research Division:Biological Sciences
Research Group:Physiology
Research Field:Comparative Physiology
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Aquaculture Fin Fish (excl. Tuna)
UTAS Author:Polymeropoulos, ET (Dr Elias Polymeropoulos)
UTAS Author:Elliott, NG (Dr Nick Elliott)
UTAS Author:Frappell, PB (Professor Peter Frappell)
ID Code:129902
Year Published:2019
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2018-12-20
Last Modified:2019-08-12
Downloads:0

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