The Assessment domain was constructed from a set of characteristics (main aspects/categories, e.g., organism group or production system), each consisting of several pre-determined elements (sub-categories, e.g., bivalves, brown macroalgae or surface systems, bottom culture systems) describing the activities, with each unique combination of characteristics (i.e., of one element per characteristic) resulting in the description of one type of LTS-system. The total of all possible LTS-systems constitutes the domain, providing the boundaries and resolution for the work to come. In this data set, the results from the mapping of existing and emerging LTS aquaculture activities around the Atlantic is reported and summarised. The results are related to FAO production statistics and analysed in terms of recommendations for the WP6 activities. In more general terms, the report may also act as a baseline to explore regional differences in LTS aquaculture diversity as well as diversification of LTS activities over time in the region.