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《Journal of Ocean University of Qingdao》 2002-03
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Effects of Temperature and Body Weight on StandardMetbolism and Endogenous Nitrogen Excretion ofMullet Liza haematocheila (T. et S.)

Xian Weiwei\ \ Zhu Xinhua (Institute of Oceanology, the Chinese Academy of Sciences, Qingdao 266071,China)  
The effects of temperature and body weight on standard metabolism and nitrogen excretion of the mullet, Liza haematocheila (T. et S.), were studied from May to December in 1999 at 13.5, 18, 21.5, 24 and 27℃. The rate of standard metabolism of mullet increased with body weight according to a power function and augmented with temperature according to an exponential function. The relative relationship could be expressed by the following multiple regression equation: R S =0.124 6 W 0.995 4 e 0.084 1 T ( r 2 = 0.922 0) . The endogenous excretion rate of ammonia ( ENE am ), urea ( ENE u ), total nitrogen ( ENE N ) and energy ( ENE e ) increased with increasing temperature and body weight. The relationships were: ln( ENE am )=-0.019 6+0.682 6ln( W )+0.013 3 T 2 - 0.411 5 T ( r 2= 0.954 5); ln( ENE u )=0.484 5+0.994 1ln( W )+0.024 3 T 2 -0.791 4 T ( r 2 =0.942 5); ln( ENE N )=0.455 1+0.730 7ln( W )+0.014 9 T 2 -0.465 0 T ( r 2= 0.971 4) ; and ln( ENE e )=3.637 0+0.727 8ln( W )+0.014 8 T 2 -0.461 7 T . The daily excretion rates of ammonia and urea were in the range of 0.15~0.88mg N/d and 0.03~0.29mg N/d respectively.
【Fund】: 国家自然科学基金重大项目 ( 4 9790 1 0 0 1 )
【CateGory Index】: Q959.4
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