MOVING PERFORMANCE OF THE BURINAWA AND FI SH HERDING MECHANISM

Burinawa is a long rope equipped with many white painted wooden strips ''buriki'' and stone weights at regular intervals, and is the main de vice used in Buriami fishery, The moving performance of the Burinawa, used in the Buriami fishery for catching red sea bream Pagrus major an d crimson sea bream Evynnis japonica, was measured by radar on board a n anchored training ship. The shape, enclosing area and towing speed o f the Burinawa were analyzed. The shape of the Burinawa was U-shaped, reduced in a similar manner with elapsed time, and was affected by the current. The enclosed area decreased almost exponentially. The towing speed of the Burinawa was 0.3 kt at the middle and 0.5 kt at both end s. The movement of the buriki and the tension of it were measured in a flume tank. Power spectra were estimated from the measurements. A dom inant frequency of 1.3 Hz was identified at only a flow speed of 0.3 k t. From the results of the experiment, it was suggested that the Burin awa drive fish schools by visual and acoustic stimuli.