director/producer, John Edginton ; producers, Gillian Darling, Jack Silberman, George Johnson ; a Sarus/Otmoor production in co-production with the National Film Board of Canada and Channel Four Television ; in association with the Knowledge Network ... [and others]
produced in partnership by Wisconsin Dept. of Natural Resources Fisheries Management & Water Resources Mgmt. ; a video production of Wisconsin Dept. of Natural Resources Bureau of Information and Education