Reversibly disengaging slidable strike indicator, positioning system, and method of using same

A reversibly disengagable strike indicator system, comprising:

• a buoyant main body portion having an exterior surface, first and second main body ends, and an axial closed-walled channel therebetween, the channel having a first end opening at the first main body end and a second end opening at the second main body end, the channel sufficient, in operation, to allow slidable passage of a fishing line therethrough without permitting the line to separate from the main body;
• an exterior retention member seat disposed around the main body surface, the line retention member seat disposed at a non-zero angle with respect to the axial channel;
• a line retention member reversibly receivable and retainable by the seat, and operative with the seat to grip and retain a fishing line passing therebetween at two points, the two points spaced apart from the end openings and opposing each other along the exterior surface of the main body, wherein the main body is configured to be slidable on the line, unimpeded by the line retention member, upon displacement of the line retention member from the seat and the main body;
• and
• at least one line stop member attachable to a fishing line, the line stop member having an outer surface, first and second stop member ends, and an axial stop member channel therebetween, with corresponding first and second stop member end openings, wherein the line stop member is reversibly receivable and engagable into the axial channel of the main body.