Social Status Of Juvenile Crucian Carp And Its Relationgship With Standard Metabolic Rate, Critical Swimming Speed And Glucose Concentration

Juvenile crucian carp, a warm water and regular feedind of breeding fish, were chosen as the experimental animal. The social status of juvenile crucian carp was identified into 2 levels by factors of successful feeding rate and aggressive behaviors at 25.0±0.5℃under laboratory conditions. The standard metabolic rate, blood glucose concentrations and critical swimming speed in fish of each social level were determined. To investigate the relationship of between their physiological state and the social status, to provide basic information for warm-water cyprinid fish of Behavioral Ecology study .The results as follows:1. Each set of experiments by observing the aggressive behavior of the fish and found that juvenile crucian carp were fighting with the obvious phenomenon; the aggressive behavior score of the 3 social status levels (high to low) of juvenile crucian carp were 8.1±0.30,1.9±0.30 and 0.0, respectively. Observed and recorded experiment of each group of fish feeding status, calculated by the end of the fish feeding rate and statistics of each group received the successful feeding rate of the 3 social status levels (high to low) of juvenile crucian carp were 51.2±1.61,29.3±1.87 and 19.5±0.73%, respectively. The successful feeding rate was positive related to aggressive behaviour score (P <0.01).2. Before and after to determine the 3 social status levels, the dominant of juvenile crucian carp showed a high level of SMR, but no significant difference (P >0.05); and no significant difference between the three levels (P >0.05). The blood glucose concentrations were 3.4±0.22,4.2±0.30 and 4.5±0.33 mmol/L(P <0.05) respectively in fish with different social status (high to low), which are dominant in the blood glucose concentrations levels lower than subordinate fish, there is a significant difference (P <0.05), while the blood glucose concentrations levels between the subordinate fish were no significant difference (P >0.05).3. This study group of 30 pairs of 10 Ucrit juvenile crucian carp was measured from high to low average of three grades, respectively: 35.5±0.22,33.7±0.66,29.8±1.02 cm/s,the overall trend showed an increase with the hierarchical status, experimental fish of Ucrit showed an increasing trend. The dominant of Ucrit in which the average is higher than the subordinate fish; between the subordinate fish was no significant difference (P >0.05), but between the 1,2-grade and 3 levels was a significant difference (P <0.05).The indications as follows:1. Through the above two indicators for the assessment of their the social status, the results showed that both juveniles under laboratory conditions there is a clear polarization of the social status; the same time, the results showed that the use of these two indicators for the assessment of juvenile crucian carp'the social status is reliable.2. In this study, the social status of juvenile crucian carp was no significant difference on the SMR, and perhaps the larger experiment error of the impact of community pressure on the SMR, it's possible that between the kinds of laboratory fish of the3. social status and the standard metabolic rate is no correlation.The results of this study show that juvenile crucian carp with higher social status had the lower blood glucose levels, while the lower grade their blood glucose levels appeared higher trend which may imply lower levels of stress and a greater fitness of physical activity.4. The results show that small groups of juvenile crucian carp with higher social status, the stronger their aerobic exercise capacity.