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Reduced n‑3 highly unsaturated fatty acids dietary content expected with global change reduces the metabolic capacity of the golden grey mullet

Abstract : In this study, we hypothesised that a reduction in n-3 HUFA availability for higher consumers, as expected with global change, would negatively impact the physiological performances of fish. The aim was to experimentally evaluate the effect of n-3 HUFA dietary content on cardio-respiratory performances of the golden grey mullet (Liza aurata), a microalgae grazer of high ecological importance in European coastal areas. These performances were evaluated in terms of critical swimming speed U crit, associated oxygen consumption MO2, post-exercise oxygen consumption and calcium fluxes in cardiomyocytes. Two replicated groups of fish were fed on a rich (standard diet, SD diet: 1.2 % n-3 HUFA on dry matter basis, DMB) or a poor n-3 HUFA (low n-3 HUFA diet, LD diet: 0.2 % n-3 HUFA on DMB) diet during 5 months and were called SD and LD groups, respectively. The results showed that the LD diet reduced growth rate as well as the aerobic capacity of L. aurata at 20 °C, suggesting that fish may have to save energy by modifying the proportion of energy allocated to energy-demanding activities, such as digestion or feeding. In addition, this LD diet induced higher levels of haematocrit and plasma osmolality, indicating a stress response at the second and third levels in that group. However, the LD diet caused a massive increase in swimming efficiency. This should improve the capacity of L. aurata to migrate and to forage over a wide area. In turn, these could then compensate for the reduction in growth rate and aerobic metabolism.
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Submitted on : Wednesday, March 4, 2015 - 11:53:36 AM
Last modification on : Wednesday, October 14, 2020 - 3:51:46 AM

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Marie Vagner, Jose-Luis Zambonino-Infante, David Mazurais, Nathalie Imbert‑auvray, Natascha Ouillon, et al.. Reduced n‑3 highly unsaturated fatty acids dietary content expected with global change reduces the metabolic capacity of the golden grey mullet. Marine Biology, Springer Verlag, 2014, 161 (11), pp.2547-2562. ⟨10.1007/s00227-014-2526-3⟩. ⟨hal-01079830⟩

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