Abstract: A weighted downrigger for troll fishing provides a vertical stabilizing fin having a medial rotatable member to aid in attracting fish and a jaw-type line clamp to releasably fasten a fishing line inwardly adjacent a lure. The stabilizing fin and rotating element both provide light reflecting surfaces, which may additionally be colored, to optically attract fish. The rotating element provides additional acoustical-like attraction for fish. The line clamp provides adjustable tensioning structure and an elongate lever arm on one jaw to magnify the force of a fishing line trailing from the lever arm to cause clamp release responsive to less force on the trailing end of a fishing line than on the inboard end of such line.