Abstract: A self-contained, battery operated fishing line tension detector and alarm system that adapts to a conventional fishing rod, reel, and line assembly. The system detects the feeding activity or strike of a fish by detecting the related change in the tension of the line. Engagement and disengagement of the line takes place without the person fishing having to handle the line. The strike alarm holds the line in an offset, unnatural position until the pull of a striking fish straightens the line which rotates a sensing arm until it touches an electrical contact; thus completing an electrical circuit which provides power for audible and visible alarms. Sensitivity to line tension is adjustable. Alarming occurs whenever line tension is above a sensitivity set point. The alarms are independent of each other and can be selectively switched in or out of the circuit. The visible alarm is illuminated for night visibility.