Based on environmental observations, our aim is to clarify relationships between behavioral ecology and environmental variables. More specifically, we develop devices and methodologies to measure behaviors of fish and crustaceans. We also examine ways of reproducing realistic habitats in the laboratory to enable analysis of periodicity of behavior, performance evaluation of sensory organs, and by such evaluations assess the adaptability of organisms to environmental change. We educate and research efficient and sustainable fishing methods in order to optimize usage of aquatic resources.