| 不同低温持续胁迫对凡纳滨对虾存活的影响 |
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| 引用本文： | 程光平,桑明远,黄国强,李文红,姬永杰,童万平,陈承锋,许明珠.不同低温持续胁迫对凡纳滨对虾存活的影响[J].广西农业科学,2013(2):333-337. |
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| 作者姓名： | 程光平 桑明远 黄国强 李文红 姬永杰 童万平 陈承锋 许明珠 |
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| 作者单位： | [1]广西大学动物科学技术学院,南宁530005 [2]广西海洋生物技术重点实验室,广西北海536000 [3]广西钦州农垦钦江农场,广西钦州535000 |
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| 基金项目： | 国家科技支撑计划项目（2008BADB9805）;广西科技攻关项目（桂科攻10100014-2）;广西海洋生物技术重点实验室科研项目（GLMBT-201102） |
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| 摘 要： | 【目的】了解凡纳滨对虾对低温持续胁迫的耐受力，为评估低温对凡纳滨对虾养殖业可能造成的风险及有效应对寒灾提供科学依据。【方法】设7、8、9、10和11℃5个低温持续胁迫试验组和一个空白对照组（室内自然水温20℃），通过观察凡纳滨对虾对不同低温胁迫的行为反应并分别记录死亡历时，应用统计学方法拟合死亡率与死亡历时的关系模型。【结果】试验期间对照组凡纳滨对虾未出现死亡，存活率为100％。凡纳滨对虾在低温持续胁迫下，首尾死亡及100％死亡历时均随胁迫温度的升高而延长，7和11℃低温胁迫时，首尾死亡及100％死亡历时分别为2．6和13_3h、27．0和158．4h。凡纳滨对虾对低温反应敏感，7-11℃的持续胁迫均能导致其死亡，但死亡历时时域不一，7和11℃持续胁迫下，其死亡历时时域分别为24．4和145．1h，即死亡历时随胁迫温度的降低而缩短。5个低温持续期内凡纳滨对虾的死亡率与死亡历时回归方程R：的置信度均高于0．9500，在7、9、1ICE持续胁迫下，凡纳滨对虾死亡率与死亡历时的关系均符合幂函数方程，其幂函数指数分别为1．2751、1．0508和1．1173；而8和10℃持续胁迫下，死亡率与死亡历时的关系曲线更符合多项式。【结论】凡纳滨对虾不耐低温，低温胁迫致死过程有一定持续期，但死亡速度随胁迫温度的降低而加快，因此养殖过程遇低温季节应加强应急管理，最大限度规避寒害风险：胁迫温度较低（7℃）时，须在短时间内完成应急管理，最长应急处理时间为1d；胁迫温度较高（11℃）时，可适当延长应急管理，但最长应急处理时间不宜超过6d。
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| 关 键 词： | 凡纳滨对虾 低温胁迫 死亡历时 耐受力 回归方程 |
Effects of different low temperature continuous stress on Litopenaeus vannamei survival |
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| CHENG Guang-ping,SANG Ming-yuan,HUANG Guo-qiang,LI Wen-hong,JI Yong-jie,DONG Wan-ping,CHEN Cheng-feng,XU Ming-zhu.Effects of different low temperature continuous stress on Litopenaeus vannamei survival[J].Guangxi Agricultural Sciences,2013(2):333-337. |
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| Authors: | CHENG Guang-ping SANG Ming-yuan HUANG Guo-qiang LI Wen-hong JI Yong-jie DONG Wan-ping CHEN Cheng-feng XU Ming-zhu |
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| Institution: | 1College of Animal Science and Technology, Guangxi University, Nanning 530005, China; 2Guangxi Key Laboratory of Marine Biotechnology, Beihai, Guangxi 536000, China; 3Qinjiang Farm of Qinzhou Agricultural Reclamation, Qinzhou, Guangxi 535000, China) |
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| Abstract: | Objective ]The tolerance of Litopenaeus vannamei against low temperature continuous stress was tested to provide scientific references for evaluating risks caused by low temperature for Litopenaeus vannamei breeding industry and cold disaster relief measures. Method]The experiments were conducted at 6 different low temperatures, viz., 7, 8, 9, 10, 11 and 20℃ （control）. Through observing the response of Litopenaeus vannamei to low temperature stress and recording the death duration, the mortality rate and lethiferous period were statistically analyzed and set up a relation model. Result] During the experiment, the survival rate of the Litopenaeus vannamei in the control group was 100% meaning there was no death. The results of the experimental group showed that within certain low temperature range, the higher temperature, the longer death duration at the first and 100% mortality; for example, sustaining stress at 7℃, the death duration at the first and 100% mortality was 2.6 and 13.3 h, respectively, but at 11℃, it was 27.0 and 158.4 h, respectively. Litopenaeus vannamei was sensitive to low temperature. At the temperature range of 7-11℃, sustaining cold stress induced mortality, but the death duration from the first to 100% was different： it was 24.4 h at 7℃ and 145.1 at ll℃, respectively. With lower temperature, the mortality period was shorter. The confidence coefficient in the regression equation of mortality rate and death duration was over 0.9500. At 7, 9 and 11℃, the survival rate and death duration conformed to power function equation with the power function index of 1.2751, 1.0508 and 1.117, respectively. While at 8 and 10℃, the survival rate |
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| Keywords: | Litopenaeus vannamei low temperature stress death duration tolerance regression equation |
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