Temperature variation affects the growth, maturation and distribution of fish species due to increasing constraints on physiological functions therefore, the aim of the present study is to evaluate effect of temperature on thermal tolerance and standard metabolic rate (SMR) of gilthead seabream (Sparus aurata). For this purpose, tolerable temperature ranges of juvenile gilthead seabream acclimated at 15, 20, 25, and 30 °C for 30 days were estimated using dynamic and static thermal methodologies. The SMRs of the fish were also determined based on oxygen consumption rate (OCR). The dynamic and static thermal tolerance zones of gilthead seabream were calculated as 737 °C2 and 500 °C2, respectively, with a resistance zone area of 155.5 °C2. The SMR of the fish at the above acclimation temperatures (AT) was determined as 138, 257, 510, and 797 mg O2 h-1 kg-1, respectively and were significantly different (P < 0.01, n = 10). The temperature quotient (Q10) in relation to the SMR of the fish was calculated as 3.45, 3.91, and 2.44 for acclimation temperature ranges of 15-20, 20-25, and 25-30 °C, respectively. The fact that the SMR increased with rising temperatures and then decreased gradually after 25 °C indicates that the temperature preference of juvenile gilthead seabream lies between 25 and 30 °C. This study shows that gilthead seabream tolerates a relatively narrow temperature range, and consequently, a low capacity for acclimatisation to survive in aquatic systems characterised by temperature variations.

中文翻译：

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适应四种温度的金头鲷幼鱼的耐热性和标准代谢率

由于生理功能的限制越来越多，温度变化会影响鱼类的生长、成熟和分布，因此，本研究的目的是评估温度对金头鲷（Sparus aurata）耐热性和标准代谢率（SMR）的影响. 为此，使用动态和静态热方法估计了在 15、20、25 和 30 °C 下适应 30 天的幼鱼的耐受温度范围。鱼的 SMR 也是根据耗氧率 (OCR) 确定的。金头鲷的动态和静态热耐受区分别计算为 737 °C2 和 500 °C2，电阻区面积为 155.5 °C2。鱼在上述适应温度（AT）下的 SMR 确定为 138、257、510、和 797 mg O2 h-1 kg-1，并且有显着差异（P < 0.01，n = 10）。对于 15-20、20-25 和 25-30 °C 的驯化温度范围，与鱼的 SMR 相关的温度商 (Q10) 分别计算为 3.45、3.91 和 2.44。SMR随温度升高而增加，然后在25°C后逐渐减小的事实表明，幼鱼的温度偏好在25至30°C之间。该研究表明，银头鲷能耐受相对较窄的温度范围，因此在以温度变化为特征的水生系统中生存的适应能力较低。和 2.44 分别用于 15-20、20-25 和 25-30 °C 的驯化温度范围。SMR随温度升高而增加，然后在25°C后逐渐减小的事实表明，幼鱼的温度偏好在25至30°C之间。该研究表明，银头鲷能耐受相对较窄的温度范围，因此在以温度变化为特征的水生系统中生存的适应能力较低。和 2.44 分别用于 15-20、20-25 和 25-30 °C 的驯化温度范围。SMR随温度升高而增加，然后在25°C后逐渐减小的事实表明，幼鱼的温度偏好在25至30°C之间。该研究表明，银头鲷能耐受相对较窄的温度范围，因此在以温度变化为特征的水生系统中生存的适应能力较低。