PURPOSE: A fish trap for catching small octopuses is provided to open and close a cone shaped circulating aperture assembled in the opening unit of the fish trap in a short period. CONSTITUTION: A rotational cap(10) is rotated to clockwise for closing a blade(38). Then, a fish trap is thrown into the sea for small octopuses to go into a cylinder(28) along the blade or the circulating aperture of the cylinder. Also, the small octopuses go into the cylinder through a circulating blade formed on the lower surface of the cylinder. Then, the fish trap is drawn up from the sea for the rotational cap to be rotated to counterclockwise. Therefore, the blade is opened for a fisher to take the small octopuses out of the fishing cap while the small octopuses do not come out of the fishing cap through the circulating blade.
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