This report was developed as a learning material for use in the AquaVitae MOOC (massive open online course) developed by the project during 2021-2022. The report presents the concept of low trophic species, discusses some of the most commonly used classification systems for culture systems (open/closed systems and intensive/extensive systems), and present a categorisation and description of production systems used in low trophic species aquaculture. The categorisation presented is based on location, i.e., land based or sea based systems, and sea based systems are subdivided into on-bottom and off-bottom systems. The use of different systems for co-culture application and recent developments of offshore/exposed areas are exemplified. Where possible, the different systems are illustrated using examples from the AquaVitae project.