Abstract: A clip-on tip-up apparatus for fishing includes a springy signal arm secured at its lower end to a releasable mounting clamp for attachment to a fishing rod in any of a number of locations. The signal arm carries a brightly colored flag near its upper free end along with a spring clip line clamp which enables the signal arm to be attached directly to a slackened fish line with sufficient force to retain the fish line releasably between opposed jaws of the line clamp and to hold the signal arm in a bent over set position. The fish line pulls free of the line clamp when a fish strikes the bait at the end of the line causing the signal arm to snap upright signaling the fisherman that a fish has taken the bait.