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- Title
Reduced n-3 highly unsaturated fatty acids dietary content expected with global change reduces the metabolic capacity of the golden grey mullet.
- Authors
Vagner, Marie; Zambonino-Infante, José-Luis; Mazurais, David; Imbert-Auvray, Nathalie; Ouillon, Natascha; Dubillot, Emmanuel; Delliou, Hervé; Akbar, David; Lefrançois, Christel
- 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, associated oxygen consumption MO, 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.
- Subjects
FISH metabolism &; climate; GRAY mullets; OXYGEN consumption; FISH physiology; FISH food; UNSATURATED fatty acids; FISHES
- Publication
Marine Biology, 2014, Vol 161, Issue 11, p2547
- ISSN
0025-3162
- Publication type
Article
- DOI
10.1007/s00227-014-2526-3