Hydroacoustic Technology Inc. is a manufacturer of hydroacoustic (sonar) fisheries research equipments. Based in Seattle, Wash., the company specializes in acoustic tags/receivers and active hydroacoustic systems. It conducts hydroacoustic research in oceans, lakes, rivers, hydropower dams, estuaries, shipping locks, etc for the assessment of fish abundance/behavior. The firm offers customers a variety of solutions, such as acoustic tags, receivers, and data loggers, split-beam hydroacoustic systems (echo sounders), consulting as well as short courses / training. Hydroacoustic Technology Inc. works with some of the leading fisheries research and management institutions in the world, such as U.S. Fish and Wildlife Service, The Environment Agency (United Kingdom) and Japanese Public Works Research Institute.