The IJmeer is a shallow inland lake located in the Netherlands, situated between Amsterdam to the west and the Markermeer to the east, forming part of the broader IJsselmeer system. Created as a result of the construction of the Houtribdijk and other major water management works, the IJmeer serves as an important ecological and recreational water body in the heart of the Randstad. Its relatively shallow character, proximity to Amsterdam, and rich aquatic ecosystem make it a productive and accessible fishery for a wide range of species. The lake supports a diverse community of fish, including both cyprinid and percid species, and its interconnected shallow and deeper zones create varied habitat that fish exploit throughout the year.