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Title: DHA but not EPA, enhances sound induced escape behavior and Mauthner cells activity in Sparus aurata
Authors: Benítez Santana, Tibiábin
Atalah, Eyad
Betancor Quintana, Mónica Beatriz
Caballero Cansino, María José 
Hernández Cruz, Carmen María 
Izquierdo López, María Soledad 
UNESCO Clasification: 3105 Peces y fauna silvestre
310502 Piscicultura
240104 Citología animal
Keywords: Polyunsaturated Fatty-Acids
Dietary Docosahexaenoic Acid
Herring Clupea-Harengus
Gilthead Seabream, et al
Issue Date: 2014
Publisher: 0031-9384
Journal: Physiology and Behavior 
Abstract: Dietary omega - 3 long chain polyunsaturated fatty acids (n - 3 LCPUFA), eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), have a marked effect on fish behavior. There is limited information on the mechanisms involved in this effect and its relation to neuron development and functioning. Deficiency of n - 3 LCPUFA reduces fish escape swimming. Mauthner cells (M-cell) are neurons responsible for initiating an escape response. The aim was to compare the effect of dietary DHA and EPA on escape behavior and neuronal activity of sea bream larvae. We studied burst swimming speed as a measure of behavior. M-cell activity was studied by ChAT immuno-fluorescence. Feeding the lowest n - 3 LCPUFA levels a lower burst swimming speed. Increase in dietary EPA did not significantly improve escape response. Elevation of dietary DHA was correlated with a higher burst speed denoting the importance of this nutrient for escape swimming. Incorporation of DHA into larval tissues was proportional to DHA dietary levels and significantly correlated with burst speed. In addition, a higher immunoreactivity to ChAT, associated to a higher neural activity, was found in M-cell of larvae fed higher dietary DHA contents. These results show first evidence of n - 3 LCPUFA on fish neuronal activity and their implications in behavior, denoting that DHA boosts escape swimming and this effect is at least partly mediated by the increase in neural activity of M-cell.
ISSN: 0031-9384
DOI: 10.1016/j.physbeh.2013.10.021
Source: Physiology and Behavior [ISSN 0031-9384], v. 124, p. 65-71
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