This topic focuses on the main aquatic environments used for aquaculture. This takes into account aquatic physico-chemical processes, community structure and function. There are two field sessions within the topic including a freshwater and marine site visit with practical sampling sessions at each. Environmental risk assessment and the environmental impacts of aquaculture are key components. This topic will be of interest to anyone concerned with the role of aquatic environments in aquaculture and to those involved in environmental impact assessments.