| 摘要 |
PROBLEM TO BE SOLVED: To provide a lightweight apparatus for stratified collection of trawl nets designed to autonomously perform changeover, opening and closing of each net mouth of the trawl nets. SOLUTION: The apparatus for stratified collection of the trawl nets is equipped with a frame 2 for towing the trawl nets 13a, 13b, 13c and 13d arranged in the upper side and the lower side, mooring the net mouth edge of the upper net of the topmost trawl net 13a to the upper edge and mooring the net mouth edge of the lower net of the lowermost trawl net 13d to the lower edge, a pair of vertical bars 3 arranged on both sides of the frame 2, sliders 12 having both ends slidably engaged with the vertical bars 3 and mooring the net mouth edge of the lower net of the upward trawl net and the net mouth edge of the upper net of the downward trawl net, a net mouth opening and closing means 8 engaging the sliders 12 with the top ends of the vertical bars 3 and releasing the engagement of the sliders one by one and a control means 9. Furthermore, the control means 9 is provided with a timer and a demountable storage medium storing the net-towing time for operating the net mouth opening and closing means 8. The control means 9 is composed so that the net-towing water depth from a bathometer and the net-towing time from the timer are input to operate the net mouth opening and closing means 8 by the arrival at the set operation water depth and the predetermined net-towing time stored in the storage medium. COPYRIGHT: (C)2008,JPO&INPIT
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