"Estuary," a 28-minute, 16-mm color film on the estuarine areas of the United States - upon which much of our seafood is dependent - has been released by the National Oceanic and Atmospheric Administration (NOAA). Produced by NOAA and sponsored by the Environmental Protection Agency, the film depicts industrial uses of estuaries, and also shows their importance as a principal source of food, a breeding place for fish and wildlife, and a site for recreation. Any human action taken in an estuary is likely to have a series of important reactions, the film stresses, pointing out the need for wise management. Estuarine areas depicted are Maryland's Chesapeake Bay, Florida's Tampa Bay, California's San Francisco Bay, and Oregon's Coos Bay. Of interest to anyone concerned with the environment, "Estuary" is aimed at general audiences but is appropriate for science and ecology classes in educational institutions of all levels. The film was produced under contract, using personnel and facilities of Hal Kirn Associates of Washington, D.C., and was supervised by Elliot Macklow, Chief, NOAA Motion Picture Services. It has an original score by William Penn and is narrated by Mel Brandt.