Abstract: A specially built installation was adopted to determine the swimming performance, swimming speed, rheotaxis frequency, and tail beat frequency of Anabarilius grahami at the water velocities 0, 0.1, 0.2, and 0.25 m·s^-1 at 25 ℃, aimed to understand the effects of water velocity on the swimming behavior of A. grahami. The rheotaxis frequency of the A. grahami was significantly higher at the water velocities 0.1, 0.2, and 0.25 m·s^-1 than at 0 m·s^-1, but no significant differences at 0.1, 0.2, and 0.25 m·s^-1. At the water velocity increased from 0 to 0.2 m·s^-1, the tail beat frequency increased significantly; but at 0.25 m·s^-1, the tail beat frequency was significantly lower than that at 0.2 m·s^-1 after 40 min. With the increase of water velocity, the swimming performance of the A. grahami changed from countercurrent swimming to countercurrent static. At the water velocities 0.1, 0.2, and 0.25 m·s^-1, the percentage of downstream swimming was lower than that of the other swimming states. In the states of countercurrent swimming, the swimming speed increased with increasing water velocity, while in the states of downstream swimming, the swimming speed had no significant correlation with water velocity. There existed significant linear correlations among the swimming speed, tail beat frequency, and flow velocity.

Key words: biomass, vegetation carbon storage, carbon density, allometric biomass equation, evergreen broadleaved forest.