Escapement of aquaculture fish into the wild is an area of much concern. This paper concerns the development of strategies to recapture escaped fish and return them to the aquaculture cage for further growth. It describes a telemetry system to evaluate possible recapture traps for the salmonid aquaculture industry. The system is used to monitor fish movement relative to a recapture trap and includes hydrophones for monitoring a trap for nearby acoustic signals from transmitters surgically implanted into fish. Information is provided on the system components, monitoring methodology & calibration, data analysis, results of tests conducted with steelhead trout at a Newfoundland site, and the benefits & limitations of using this specific telemetry approach.