Abstract: An illuminated fishing bobber is formed from two threadably connected hemispherical shells. A transparent dimple adjacent one end of the body member houses a light and a conical reflector. A counter weight in the body member causes the dimple to be disposed in a normally inverted orientation when the bobber is floating in a body of water. An eyelet on the dimple is provided for securement to a line from a conventional fishing pole. A rotational spool of line in the body member contains an adjustable drag mechanism for exerting an adjustable tension on the line. A free end of line from the spool passes through an aperture diametrically opposite the dimple for connection to an external hook. Upon a fish strike, the bobber is turned to an upright orientation which causes a battery to be connected to the light by virtue of a position sensitive switch. A hinged brake arm is used to lock a stationary rim of the spool within the body member.