| 摘要 |
PROBLEM TO BE SOLVED: To provide a net lift up device for a box net capable of lifting up a bottom net without requiring much labor or a boat. SOLUTION: This net lift up device is related to a box net 4 formed by a surrounding side net 2 installed with an entrance for introducing fishes at the part of it, and a bottom net 3 extended and spanned between lower end of the side net 2, as a box shape having an opening at its upper surface. Floats 5 formed freely as expanded or shrank by the feeding or exhausting of air and capable of floating the bottom net to water surface by the buoyancy of its expansion, is attached to the bottom net 3. On lifting up the bottom net 3 to the water surface for capturing the fishes collected in the box net 4, it is possible to perform the lift up of the net by taking advantage of the buoyancy on feeding air into the floats 5.
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