1) Researchers tested an acoustic tag tracking system in a hydroelectric dam tailrace to detect tagged fish. They performed tests by towing an active acoustic tag behind a boat to test array coverage and tracking performance. 2) The initial tests determined that the 5ms coded pulse from the tags had the greatest detection range and that all hydrophones were functional with sufficient detection range in the noisy tailrace conditions. 3) Figure 6 documents the procedures used to test tag tracking results in the tailrace, which included programming tags with different signal types and determining the most detectable signal for tracking fish.