This research aimed at study the influence from fins amputation to the fish swimming ability to assess if it’s a feasible means to the Tanichthys albonubes marking and recapture experiment in the wild. The dorsal fins, anal fins, caudal fins and pectoral fins of the T.albonubes were respectively fully amputated. Under each fins amputation, six durations (Δt), which were respectively 5 min, 10 min, 15 min, 20 min, 25 min and 30 min, were set up to calculate the Absolute critical swimming speed(Uacrit) . All the observed value were analyzed with One-way ANOVA and Two-way ANOVA. The results showed that the critical swimming speeds slowed with the duration extension. Fish with intact fins (BL = 24 ± 1 mm) had absolute critical swimming speed(Uacrit) from 251.98 ± 11.04 mm/s to 333.78±12.44 mm/s under different durations. In the same condition, amputating the dorsal fins or anal fins did not significantly influence the Ucrit(P＞0.05), but amputating the caudal fins or pectoral fins significantly did(P＜0.01). The removal of caudal fins and pectoral fins decreased absolute critical swimming speeds of 47.20% and 22.98% respectively, and they are in highly significant differences with each other（Fig.2）. The experimental conclusion of this research is that fully amputating the dorsal fins was a feasible means to mark the T.albonubes in marking and recapture experiments in the wild.