Abstract:

There are many kinds of swimming mode in the fish world, and we investigated two of them, used by cyprinids and bull-trout. In this paper we track the locomotion locus by marks in different flow velocity from 0.2 m•s^-1 to 0.8 m•s^-1. By fit the data above we could find out the locomotion mechanism of the two kinds of fish and generate a mathematical model of fish kine-matics. The cyprinid fish has a greater oscillation period and amplitude compared with the bulltrout, and the bulltrout changes velocity mainly by controlling frequency of oscillation.

Key words: bionic propulsion, aquatic bionics, fish swimming, analysis of locomotion, tracking locus