Journal of Guangxi Normal University(Natural Science Edition) ›› 2011, Vol. 29 ›› Issue (2): 104-109.

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Analysis of Cold Tolerance Measure at Low-temperature in Six Tilapia Families

LU Qi-xi1,2, LIN Yong1, BIN Shi-yu2, TANG Zhang-sheng1, PENG Ting3   

  1. 1.Guangxi Research Institute of Fisheries,Nanning Guangxi 530002,China;
    2.College of Life Science,Guangxi Normol University,Guilin Guangxi 541004,China;
    3.College of Animal Science and Technology,Guangxi University,Nanning Guangxi 530021,China
  • Received:2010-12-10 Published:2018-11-19

Abstract: The study was done to assess the cold hardy capacityin 6 families of U.S.strains tilapia Oreochromis aureus.In the condition ofindoor artificial cooling,with 0.3 °C/3 h cooling method,calculated the semi-lethal low-temperature (LT50),lethal temperature and cooling degree hours(CDH) for each tilapia family to assess the cold tolerance of each family.The results showed that the LT50 values of the six families:5.80、5.70、5.80、5.83、6.00、5.80 °C and the CDH values are:1 102.50、1 130.67、1113.00、1 092.10、1 047.03、1 092.10 h.The correlation analysis and multiple comparisons amongLT50 values and CDH values showed that family Ⅴ were significant differences among with other families,which means that itscold hardy capacity is relatively weaker than the other families,while the LT50 values and CDH values of the rest families showed no statistical difference among themselves.The cold hardy capacity of the 6 families have been inherited stably and enhanced.

Key words: tilapia, family, semi-lethal low temperature, coolingdegree hours, cold hardy capacity

CLC Number: 

  • S917.4
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