A pelagic and/or mid water trawl using canvas kites as net-mouth opening device was developed. The wing kites for horizontal net-mouth opening and the para-kites for vertical opening were designed and the optimum dimension of kites was determined according to the drag of a trawl net of 25.96m in total length. As a result of sea trials using the trawl net, the height of the net-mouth was kept to be 6.03m on average and little change in the height of the net-mouth was observed, within the wide towing speed from 1.55m/s to 2.58m/s. The depth of the cod-end was also maintained at the same level as the center of the net-mouth. The drag of the trawl net was approximately 17.8kN at a towing speed of 2.06m/s (4knot). In addition, working depth of the net was controllable with change in the warp length, but at a given warp length the depth of mid water trawl with canvas kites was almost half of that of the one with conventional otter boards.