Abstract:

The juvenile Aristichthys nobilis swimming capability and swimming behaviour were tested using experiment apparatus by increasing velocity method.The results showed as follows.(1) The actual standard metabolic rate (SMR) was 18727±545 mgO2/(kg·h) which was closed to the estimated SMR (18281 mgO2/(kg·h)).(2) There was high swimming efficiency in Aristichthys nobilis because the power value of swimming speed (U) was 130 which was low level in the oxygen consumption rate (MO2) power equationMO2=18281+3983 U1.30. (3) In the experiment, critical swimming speed (Ucrit) was 457±056 BL/s which was similar to Piceus’ critical swimming speed. (4) The ability for recovery in Aristichthys nobilis was high,because the excess postexercise oxygen cost (EPOC) was 10716 mgO2/kg which was lower than other fishes.The aerobic metabolic rate renewed to the normal level after 45-60 min later,when Aristichthys nobilis was fatigue.(5) In the relation curve between the cost of transport (COT) and swimming speed,the value of COT was low level in 4-6BL/s swimming speed.Therefore,the efficiency of energy was excellent at that condition. And the equation COT was COT=664 U-1+131 U0.34.(6) The equation TBF=202+053 U obtained by the relationship between the tail beat frequency (TBF) and the swimming speed.〖HJ1〗〖HJ〗