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Título: | Effect of temperature on the metabolism, behaviour and oxygen requirements of Sparus aurata |
Autor: | Remen, Mette; Nederlof, Marit; Folkedal, Ole; Thorsheim, Grethe; Sitjà-Bobadilla, Ariadna CSIC ORCID ; Pérez-Sánchez, Jaume CSIC ORCID; Oppedal, Frode; Olsen, Rolf Eric | Palabras clave: | Hypoxia Scrit Temperatures Feeding rates Oxygen threshold Aquaculture Metabolism Behaviour Pcrit |
Fecha de publicación: | 3-sep-2015 | Editor: | Inter Research | Citación: | Aquaculture Environment Interactions 7: 115-123 (2015) | Resumen: | We investigated the effect of temperature on the limiting oxygen saturation (LOS) of gilthead sea bream Sparus aurata. This threshold was defined as the % O2 saturation where fish no longer upheld their routine metabolic rate (RMR, the metabolic rate of fed and active fish) during a progressive decline in oxygen saturation. S. aurata (398 ± 10 g, mean ± SE) were kept in 3 replicate tanks and subjected to 3 changes in temperature: 16 to 20°C, 20 to 16°C and 16 to 12°C. At each temperature, fish were left to acclimatize for 8 to 10 d, before daily feed intake (DFI), the routine oxygen consumption rate (routine MO2, mg kg-1 min-1) and the LOS were measured. In addition, at 20°C the swimming speed was measured in fish subjected to a decline in O2 from full air saturation to levels below the LOS (minimum of 8-10% O2). For the temperature range tested (12-20°C), DFI, MO2 and LOS increased exponentially with temperature (7.5-, 3.6- and 2.2-fold, respectively) with mean (± SE) LOS being 17 ± 1, 21 ± 0 and 35 ± 5% O2 at 12, 16 and 20°C, respectively. A gradual decline in swimming activity was observed as O2 declined below the LOS, indicating increasing metabolic stress and/or a 'sit-out' coping strategy which may prolong survival time in severe hypoxia. The results show the importance of temperature as an influential variable over the environmental O2 requirements of S. aurata. © The authors 2015. | Versión del editor: | https://doi.org/10.3354/aei00141 | URI: | http://hdl.handle.net/10261/144335 | DOI: | 10.3354/aei00141 | Identificadores: | issn: 1869-7534 |
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