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Title

Cortisol response to air exposure in Solea senegalensis post-larvae is affected by dietary arachidonic acid-to-eicosapentaenoic acid ratio

AuthorsAlves Martins, D.; Engrola, Sofía; Morais, Sofia; Bandarra, Narcisa; Coutinho, Joana; Yúfera, Manuel ; Conceição, L. E. C.
KeywordsStress
Cortisol
Fatty acids
Arachidonic acid
Eicosapentaenoic acid
Solea senegalensis
Issue DateDec-2011
PublisherSpringer
CitationFish Physiology and Biochemistry 37(4): 733-743 (2011)
AbstractAn experiment was conducted in order to evaluate the effects of feeding frozen Artemia diets differing in arachidonic acid-to-eicosapentaenoic acid ratios (ARA/EPA) on growth, survival and stress coping ability of Senegalese sole post-larvae (19-31 days after hatch). Two experimental diets presenting high ('High'; 3. 0) or low ('Low'; 0. 7) ARA/EPA ratios were tested under two rearing conditions: undisturbed (C) and stressed by a 2-min air exposure every two days (S). Growth, survival and basal cortisol levels were similar between groups indicating that independently of dietary ARA/EPA ratios, fish were able to cope with the repeated stress imposed. Also, cortisol levels at 3 h past air exposure were determined in all groups at the end of the experiment. Among fish fed the 'Low' diet, C groups seemed to present a quicker recovery from the acute stress (basal-like levels) than S groups. Repeated stress effects were not apparent in fish fed the 'High' diet and, relative to basal levels, twofold higher cortisol concentrations were detected at 3 h, in both C and S groups. This study suggests the importance of ARA in steroidogenesis regulation and the modulatory role of EPA in this process. Despite the tolerance to a wide range of dietary ARA/EPA as indicated by growth and survival results, acute stress coping response may be more efficient in Senegalese sole post-larvae fed low ARA/EPA ratios and, under these particular conditions, a faster recovery of cortisol to basal values could be indicative of rearing conditions (undisturbed vs. repeatedly stressed). © 2011 Springer Science+Business Media B.V.
URIhttp://hdl.handle.net/10261/101526
DOI10.1007/s10695-011-9473-4
Identifiersdoi: 10.1007/s10695-011-9473-4
issn: 0920-1742
e-issn: 1573-5168
Appears in Collections:(ICMAN) Artículos
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