The Research Aquarium Infrastructure (RAI) database contains detailed information on the technical specifications of aquarium facilities at ASSEMBLE+ JRA4 partner marine stations. The long-term objective is to facilitate cross-consortium implementation of standardized infrastructure and experimental systems for the culture of marine organisms for biological and ecological research. Research aquarium infrastructure involves the following processes: seawater intake, primary treatment, secondary treatment, distribution, experimental facilities, waste water treatment. Basic components of these processes include equipment such as pumps, filters, tanks, temperature control systems, chemical control systems, degassing columns, sterilization systems, gas distribution systems, automats, etc.. A fact sheet is available for each component in the database providing images and detailed information on make/model, supplier, specifications, maintenance requirements and general comments.