Researchers at North Carolina State University have developed a remote monitoring system to track the behavior of freshwater mussels, which could be used to detect toxic substances in aquatic ecosystems. The system, which resembles a custom Fitbit for mussels, uses two inertial measurement units (IMUs) attached to each mussel to measure shell movement and determine if the mussel is closing its shell. The data is transmitted wirelessly and could be expanded to monitor dozens of mussels. The researchers are now testing the system's robustness and plan to conduct field testing.