As a basic study for practical realization of enclosed circulating flow type land culture for Trachurus japonicus, this study investigated effects of swimming speed and seawater temperature on oxygen consumption, the relationship between the swimming number and the Reynolds number, and the relationship between body length and body weight. The following results were obtained. (1) There are two cases in the relationship between swimming speed and oxygen consumption: that in which oxygen consumption increases with swimming speed gradually, and that in which oxygen consumption increases drastically with swimming speed. (2) Oxygen consumption increases with seawater temperature. (3) The maximum swimming speed, at which maximum oxygen consumption is obtainable, is 4.5 body lengths per second at 15-30℃. (4) Results show that the breeding flow rate fit for flowing cultivation is about two body lengths per second. (5) The relationship between the swimming number S_u and the Reynolds number R_e is represented as S_u=2.40×10^{-2}・R_e^{0.282}； the swimming number varies from 0.50 to 0.76. (6) The relationship between body length (BL[mm]) and body weight (BW[g]) is represented as BW=1.95×10^{-5}・BL^3.