Robotic fish that dynamically interact with liv fish shoals dramatically augment the toolset of behavioral biologists. We have developed in Guppies and similarly small fish. This contribution presents full implementation Details of he System and promising experimental results. Over long durations our robots are able to integrate themselves into shoals or recruit he group to exposed locations hat are usually avoided. This system is the first open-source projekt for both software and hardware components and is supposed to facilitate research in the emerging field of bio-hybrid societies.