Effect of long-term thermal challenge on the Antarctic notothenioid Notothenia rossii

The thermal stability of the Antarctic Ocean raises questions concerning the metabolic plasticity of Antarctic notothenioids to changes in the environmental temperature. In this study, Notothenia rossii survived 90 days at 8 degrees C, and their condition factor level was maintained. However, their...

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Bibliographic Details
Published in:Fish Physiology and Biochemistry
Main Authors: Kandalski, Priscila Krebsbach, Zaleski, Tania, Forgati, Mariana, Baduy, Flávia, Eugenio, Danilo Santos, Machado, Cintia, Dmengeon Pedreiro de Souza, Maria Rosa, Piechnik, Claudio Adriano, Favaro, Luis Fernando, Donatti, Lucelia
Format: Article in Journal/Newspaper
Language:English
Published: Springer 2019
Subjects:
Antioxidant defense system
Oxidative stress
Biochemical parameters
Climate-change
Temperature-acclimation
Elevated-temperature
Clarias-gariepinus
Goldfish tissues
African catfish
Cold adaptation
Antarctic
Antarctic Ocean
The Antarctic
Antarc*
Notothenia rossii
Online Access:http://hdl.handle.net/10400.1/14281
https://doi.org/10.1007/s10695-019-00660-3
Description
Summary:The thermal stability of the Antarctic Ocean raises questions concerning the metabolic plasticity of Antarctic notothenioids to changes in the environmental temperature. In this study, Notothenia rossii survived 90 days at 8 degrees C, and their condition factor level was maintained. However, their hepatosomatic (0.29x) index decreased, indicating a decrease in nutrient storage as a result of changes in the energy demands to support survival. At 8 degrees C, the plasma calcium, magnesium, cholesterol, and triglyceride concentrations decreased, whereas the glucose (1.91x) and albumin (1.26x) concentrations increased. The main energy substrate of the fish changed from lipids to glucose due to a marked increase in lactate dehydrogenase activity, as demonstrated by an increase in anaerobic metabolism. Moreover, malate dehydrogenase activity increased in all tissues, suggesting that fish acclimated at 8 degrees C exhibit enhanced gluconeogenesis. The aerobic demand increased only in the liver due to an increase (2.23x) in citrate synthase activity. Decreases in the activities of superoxide dismutase, catalase, and glutathione-Stransferase to levels that are most likely sufficient at 8 degrees C were observed, establishing a new physiological activity range for antioxidant defense. Our findings indicate that N. rossii has some compensatory mechanisms that enabled its long-term survival at 8 degrees C. CAPESCAPES CNPqNational Council for Scientific and Technological Development (CNPq) FAPERJ through projects PNPD (CAPES) [2443/2011] EBA (MCTI/CNPq) [52.0125/2008-8] INCT-APA (CNPq)National Council for Scientific and Technological Development (CNPq) [574018/2008-5, FAPERJ E-26/170.023/2008] EBA (CNPq)National Council for Scientific and Technological Development (CNPq) [305562/2009-6, 305969/2012-9]

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