| 摘要: |
| 采用封闭流水式实验方法，研究了氨氮、温度和体重对大口黑鲈（Micropterus salmoides）耗氧率、窒息点的影响。结果表明：在设定的总氨氮浓度0-8.61mg/L范围，随着氨氮浓度增加，大口黑鲈幼鱼耗氧率呈现先增加后降低的趋势，峰值为0.338mg/（g·h），窒息点随着氨氮浓度的增加而递增，影响显著（P<0.05）；在13-33℃的实验温度范围，随着温度升高，耗氧率先增加，在29℃时达到峰值0.392mg/（g·h），随后出现下降。在体重6.66-15.87g范围，耗氧率随着体重的增加而下降，最低值为0.112mg/（g·h）；耗氧率存在明显的昼夜节律变化，夜均0.214mg/（g·h）>日均0.199mg/（g·h），二者差异显著（P<0.05），并在2：00-6：00和18：00-20：00时间段出现两个峰值。 |
| 关键词: 氨氮 温度 体重 耗氧率 窒息点 昼夜变化 |
| DOI：10.11693/hyhz20190600115 |
| 分类号:S965.1 |
| 基金项目:国家海洋公益性项目，201505025号。 |
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| EFFECTS OF AMMONIA EXPOSURE, TEMPERATURE, AND BODY WEIGHT ON OXYGEN CONSUMPTION RATE AND ASPHYXIATION POINT OF JUVENILE LARGEMOUTH BASS MICROPTERUS SALMOIDES |
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YANG Si-Qi, ZHENG Hong-Wu, SUN Ying, ZHU Ai-Yi
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Zhejiang Ocean University, National Engineering Research Center for Marine Aquaculture, Zhoushan 316022, China
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| Abstract: |
| The effects of ammonia, temperature, and body weight on oxygen consumption rate and asphyxiation point of Micropterus salmoides were studied in a closed-recirculation experiment. Results show that within the range of ammonia concentration from 0 to 8.61mg/L, the oxygen consumption rate increased first and then decreased with a peak value of 0.338mg/(g·h). The asphyxiation point increased with the increase of ammonia concentration, and showed significant difference (P<0.05). Within the experimental temperature range of 13-33℃, the oxygen consumption rate increased first, reached a peak of 0.392mg/(g·h) at 29℃, and then declined. The oxygen consumption rate decreased with the body weight increase with the lowest value of 0.112mg/(g·h). The oxygen consumption rate showed an obvious change of circadian rhythm with significant difference (P<0.05). The night average and daytime average of the oxygen consumption rate was 0.214 and 0.199mg/(g·h), respectively. The average oxygen consumption rate at night was much higher than that in the daytime, and two peaks appeared at 2:00-6:00 and 18:00-20:00. |
| Key words: ammonia nitrogen temperature body weight oxygen consumption rate asphyxiation point circadian rhythm change |
