Journal of Guangxi Normal University(Natural Science Edition) ›› 2012, Vol. 30 ›› Issue (1): 105-110.

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Tolerance of GIFT Tilapia (Oreochromis niloticus) under DifferentLow Temperature Stress

TANG Zhang-sheng1, LU Qi-xi1,2, LIN Yong1, BIN Shi-yu1,2, PENG Ting3, ZHONG Shu-hong3, GAN Xi1   

  1. 1.Guangxi Research Institute of Fisheries,Guangxi Key Laboratory of Aquatic Genetic Breeding and HealthyAquaculture,Nanning Guangxi 530002,China;
    2.College of Life Science,GuangxiNormal University,Guilin Guangxi541004,China;
    3.College of Animal Science and Technology,Guangxi University,Nanning Guangxi 530021,China
  • Received:2011-09-22 Online:2012-01-20 Published:2018-12-03

Abstract: The study was done to assess low-temperature tolerance of GIFT tilapia.In the condition of indoor artificial cooling,with 0.5 °C/2h cooling down to different low temperature point,the coma and death situation are compared to evaluate their low-temperature tolerance.The results showed thatcoma temperature ranged from 8.9 °C to 10.5 °C,the semi-lethal duration thetemperature of half coma of GIFT tilapia was about 9.6 °C.The time of GIFT tilapia from the beginning coma to dead was 14.5,18.5,24.5 and 28.5 h under lowtemperatures of 8,9,10 and 11 °C,respectively.The significant linear regressionbetween the coma duration and the cumulative mortality of GIFT tilapia was y=-0.048 9x2+1.433 0x-9.507 8(R2=0.999 9),y=-0.013 6x2+0.502 4x-3.638 5(R2=0.964 9),y=0.003 8x2-0.046 1x-0.134 4(R2=0.984 3),y=-0.003 4x2+0.244 3x-3.213 1(R2=0.994 5) at 8,9,10 and 11 °C,respectively.GIFT tilapia low-temperature tolerance was closely related with coma duration and temperature,and8 °C group tolerated the shortest,11 °C group the longest.

Key words: GIFT tilapia (Oreochromis niloticus), low temperature stress, coma duration, mortality, tolerance

CLC Number: 

  • S917.4
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