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- Title
Metabolic and molecular stress responses of gilthead seam bream Sparus aurata during exposure to low ambient temperature: an analysis of mechanisms underlying the winter syndrome.
- Authors
Kyprianou, Themis-Dimitrios; Pörtner, Hans O.; Anestis, Andreas; Kostoglou, Basile; Feidantsis, Konstantinos; Michaelidis, Basile
- Abstract
The winter syndrome in the gilthead sea bream Sparus aurata indicates that the species is exposed to critically low temperatures in Mediterranean aquaculture in winter. The present study of metabolic patterns and molecular stress responses during cold exposure was carried out to investigate this 'disease', in light of the recent concept of oxygen and capacity limited thermal tolerance. The metabolic profile of fuel oxidation was examined by determining the activities of the enzymes hexokinase (HK), aldolase (Ald), pyruvate kinase (PK), l-lactate dehydrogenase ( l-LDH), citrate synthase (CS), malate dehydrogenase (MDH) and 3-hydroxyacyl CoA dehydrogenase (HOAD) in heart, red and white muscle after exposure to temperatures of 10, 14 and 18°C. Especially, the increase in LDH activity combined with the accumulation of l-lactate in tissues indicates that temperatures below 14°C are critical for Sparus aurata and stimulate the anaerobic component of metabolism. Increase in the activity of HOAD suggests that oxidation of free fatty acids might contribute to ATP turnover at low temperatures. The expression of Hsp70 and Hsp90 in all tissues examined revealed a cellular stress response during cooling below 18°C. In the light of winter temperatures in S. aurata cultures around 10°C, our data suggest that the fish are exposed to stressful conditions at the low end of their thermal tolerance window. These conditions likely impair the aerobic capacity of the fish, compromise the rates of growth and reproduction and may contribute to elicit pathological conditions.
- Subjects
SPARUS aurata; MARINE fish physiology; WINTER; LOW temperatures; SEASONAL effects on wildlife; LACTATE dehydrogenase; PYRUVATE kinase; MEDITERRANEAN climate; PHYSIOLOGY
- Publication
Journal of Comparative Physiology B: Biochemical, Systemic & Environmental Physiology, 2010, Vol 180, Issue 7, p1005
- ISSN
0174-1578
- Publication type
Article
- DOI
10.1007/s00360-010-0481-y