Cold-induced alterations on proximate composition and fatty acid profiles of several tissues in gilthead sea bream (Sparus aurata)

Cultured gilthead sea bream (Sparus aurata L.) are exposed to a multifactorial disease termed "winter syndrome", and low temperatures are the recurrent inducing factor. The effects of low temperatures on tissue composition and fatty acid profiles of polar and non-polar lipid fractions of sea bream were studied in two conditions: a gradual temperature drop (GD: from 18°C to 8°C at a rate of 1°C•day- 1) or two sharp drops (SD: from 18°C to 12°C and then from 12°C to 8°C completed within a day, with a 1 week interval). No significant differences were detected between GD and SD in any of the variables studied. Animals stopped feeding when the temperature fell below 13°C, and the resulting fast provoked body weight losses of 12% (GD) and 10% (SD) at the end of the experiment (15th day), and decreased non-polar lipids content in muscle. Unsaturation of polar fatty acids in muscle (SD) and in gills (SD and GD) rose, demonstrating a homeoviscous acclimation of membranes to cold. In contrast, unsaturation of liver polar fatty acids did not rise, but liver showed a great increase in total lipid content on day 15 (+ 35% SD, and + 43% GD), caused by the increase in non-polar lipids, especially n-3 fatty acids. The high deposition of these essential fatty acids, mainly 22:6n-3, in fasting sea bream implied mobilization from extra-hepatic stores and caused dramatic modifications in the physical properties of the liver (larger, more friable and yellowish), often associated with winter disease. Moreover, plasma aspartate aminotransferase (ASAT) levels rose three-fold in the two conditions. No fish succumbed to winter disease, but the incipient appearance of symptoms was evident. The relationships between the changes in muscle, gill, and, especially liver, at low temperature and the clinical signs of 'winter disease' are discussed. © 2005 Elsevier B.V. All rights reserved.