Abstract: The application of ultrasonic telemetry in aquatic animals study was based on the urgent demand of studying the behaviors and physiology of marine mammals. At present, it has been developed into one of the principal techniques in the ecological study of aquatic animals such as fishes, crustaceans, dolphins, and sea turtles. This paper reviewed the past 50 years progress of applying ultrasonic telemetry in aquatic animals study, introduced the composition of ultrasonic telemetry system, its operation, and applicable circumscription, analyzed the major problems in aquatic animal telemetry with this technique, and proposed associated recommendations and applications.

Key words: Simulated acid rain, Release of heavy metals, Form transformation of heavy metals