Abstract: The optimum temperature for growth and feeding was studied in lenok Brachymystax lenok weighing 1.72±0.24g at of 6℃,11℃,16℃,and 21℃for 7 days in a laboratory.The results showed that the specific growth rate（SGR）,daily weight gain（DWG）,food conversion efficiency（FCE）and feed intake（FI） were found significantly higher than those in other groups at 16℃.The correlations between these parameters and water temperature（T） were described by nonlinear regression models： SGR=（-2.601）＋（0.887）T＋（-0.027）T2（P0.01,R= 0.979）,FI=（0.111）＋（0.292）T＋（-0.009）T2（P0.01,R=0.990）,FCE=（52.828） ＋（11.951） T＋（-0.393） T2（P0.01,R=0.933）.It is concluded that the optimum temperature was showed to vary from 15.20℃ to 16.43℃.

Key words: Brachymystax lenok, water temperature, feed intake, specific growth rate