Impairment on fillet fatty acid profile and oxidative damage in pirarucu, Arapaima gigas, acutely exposed to extreme ambient temperature

Climatic events are affecting the Amazon basin and according to projections it is predicted the intensification of climate changes through increases in temperature and carbon dioxide (CO2). Recent evidence has revealed that exposure to an extreme climate scenario elicits oxidative damage in some fis...

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Published in:	Comparative biochemistry and physiology. Part A, Molecular & integrative physiology Vol. 293; p. 111625
Main Authors:	Siqueira, Cristiano S., Ribeiro, Stephanie R., Milarch, Carine F., Wagner, Roger, Baldisserotto, Bernardo, Val, Adalberto L., Baldissera, Matheus D.
Format:	Journal Article
Language:	English
Published:	United States Elsevier Inc 01-07-2024
Subjects:	Animals Antioxidants - metabolism Carbon dioxide Carbon Dioxide - pharmacology Environment Fatty Acids Fatty Acids, Unsaturated Fish Fishes - metabolism Oxidative Stress Temperature Oxidative stress Environment Fish Temperature Carbon dioxide
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Summary:	Climatic events are affecting the Amazon basin and according to projections it is predicted the intensification of climate changes through increases in temperature and carbon dioxide (CO2). Recent evidence has revealed that exposure to an extreme climate scenario elicits oxidative damage in some fish species, impairing their metabolism and physiology, contributing to their susceptibility. Thus, the comprehension of physiological alterations in Arapaima gigas (pirarucu) to the climatic changes forecasted for the next 100 years is important to evaluate its capability to deal with oxidative stress. The objective of this work was to determine whether antioxidant defense system is able to prevent muscle oxidative damage of pirarucu exposed 96 h to extreme climate scenario, as well as the effects of this exposition on muscle fatty acid levels. Lipid peroxidation and reactive oxygen species significantly increase in the muscle of pirarucus exposed to an extreme climate scenario compared to control, while muscle superoxide dismutase, catalase, and glutathione peroxidase were significantly lower. Total amount of saturated fatty acids (SFAs) was significantly higher in pirarucu exposed to an extreme climate scenario compared to control, while total content of monounsaturated (MUFAs) and polyunsaturated fatty acids (PUFAs) was significantly lower. Exposure to an extreme climate scenario causes muscular oxidative stress and that the antioxidant systems are inefficient to avoid oxidative damage. In addition, the increase of total SFAs and the decrease of MUFAs and PUFAs probably intend to maintain membrane fluidity while facing high temperature and CO2 levels. [Display omitted] •Pirarucu exposed to an extreme climate scenario presented muscle oxidative stress.•Exposure to an extreme climate scenario caused impairment on fish fillet fatty acids.•Antioxidant systems are inefficient to avoid oxidative damage in fish exposed to extreme climate scenario.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1095-6433 1531-4332
DOI:	10.1016/j.cbpa.2024.111625