The Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB) is a German research institute focused on freshwater ecosystems, fish populations, and aquatic biodiversity. Its original German name is Leibniz-Institut für Gewässerökologie und Binnenfischerei. As a member of the Leibniz Association, the institute conducts interdisciplinary research on ecological processes, water management, and conservation, providing scientific advice to policymakers and supporting sustainable management of inland waters.