Where do fish reside during different parts of the day and seasons? What is the preferred habitat of different species, and how do fish interact in time and space? What are behavioral patterns and differences among economically important, predator fish species such as pike, wels catfish and perch? How do fish react to changes in weather and seasonal conditions, and how are they expected to react under climate change? Understanding questions such as these, and the general use of space and time by animals, is one of crucial tasks of ecology. Until recently, detailed analyses that would provide answers and improve our knowledge on these topics were not possible, due to logistic and technical challenges such research would require.