The social status of alican blue\|marked juvenile crucian carp (n=3/group, total 3 groups, w: ((3.5±0.1)g) was divided into 3 levels based on values of successful feeding rate and aggressive behaviour at (25.0±0.5)℃ Prior to social status identification, standard metabolic rate (SMR) for each fish was determined. After fish were grouped into their respective social level using aggression behavior and feeding rate as parametersblood glucose concentrations and critical swimming speed (Ucrit) were measured. The successful feeding rate of juvenile crucian carp of 3 social status levels (high to low) were (51.2±1.61)%,(29.3±1.87)% and (19.5±0.73)%; meanwhile the aggressive behaviour scores were (81±0.30), (1.9±0.30) and 0.0, respectively（P＜0.05). However, the Ucrit in fish with different social status (high to low) were (35.5±0.22), (33.7±0.66) and (29.8±1.02)cm/s (P<0.05) and the blood glucose concentrations were (3.4±0.22), (4.2±0.30) and (4.5±0.33) mmol/L (P <0.05). There was no significant difference in SMR of fish of different social status before and after social status was established and identified （P＞0.05）. The results showed that social hierarchy is present in juvenile crucian carp and can be consistently determined using feeding success rate and aggressive behavior as the indicators. Furthermore, fish of higher social status had a higher swimming capacity and lower blood glucose concentrations which may imply lower levels of stress and a greater fitness of physical activity.