温度和盐度对龙虎斑耗氧率和排氨率的影响

Effects of temperature and salinity on oxygen consumption and ammonia excretion of hybrid grouper（Epinephelus fuscoguttatus♀×Epinephelus lanceolatus♂）

中文关键词: 温度  盐度  耗氧率  排氨率  棕点石斑鱼♀× 鞍带石斑鱼♂杂交鱼

英文关键词: Temperature  Salinity  Oxygen consumption rate  Ammonia excretion rate  Epinephelus fuscoguttatus♀× Epinephelus lanceolatus♂

中文摘要:

      利用实验生态学方法研究了温度和盐度（S）对体质量为(98.8±4.3)g龙虎斑（棕点石斑鱼♀× 鞍带石斑鱼♂）的呼吸和排泄影响。结果表明，不同温度和S对龙虎斑的耗氧率（RO）和排氨率（RN）有显著影响（P<0.05）。在水温15-35℃范围内，龙虎斑的RO随着温度的升高而升高，在35℃时达到最大值，为(0.228±0.011)mg/（g • h），但RN随着温度的升高先升高后降低，在30℃时达到最大值，为(3.985±0.094)μg/（g • h）。S为5-35时，龙虎斑的RN随着S的升高而降低，其关系式为RN=3.689e-0.067S（R2=0.963）；在S处于5-15和25-35范围内，RO随S升高而下降，但S在15-25范围时，RO则随S升高而升高。在S为28，水温15-35℃范围内，龙虎斑代谢的O∶ N范围为44.416-73.667；在水温28℃，S为5-35时，O∶ N值为59.577-275.034。

英文摘要:

      The effects of temperature and salinity on the respiration and excretion of dragon-tiger grouper (hybrid of Epinephelus fuscoguttatus♀× E. lanceolatus♂) at body weight of (98.8±4.3)g were studied using methods in experimental ecology. The results showed that temperature and salinity had significant effects on both oxygen consumption and ammonia excretion (P<0.05) of the grouper. The oxygen consumption rate increased as the temperature increased from 15℃ to 35℃, with the highest value of (0.228±0.011)mg/（g • h） at 35℃; while the ammonia excretion rate showed an increase-decrease trend with the highest value of (3.985±0.094)μg/（g • h） at 30℃. As salinity increased from 5 to 35, the ammonia excretion rate decreased and the relationship was expressed as RN=3.689e-0.067S (R2=0.963). At salinity ranges of 5-15 and 25-35, the oxygen consumption rate decreased as salinity increased, while within salinity of 15-25 it increased with the increasing salinity. The O/N ratio ranged from 44.416 to 73.667 at temperature of 15-35℃ and salinity of 28, and from 59.577 to 275.034 at salinity of 5-45 and temperature of 28℃.