The ecosystem approach to aquaculture (EAA) focuses on balancing societal, environmental and ecological objectives in aquaculture operations. This approach can be applied at the farm, regional or policy-making level and should work to improve sustainability of aquaculture operations as well as human benefit.  This is done by assessing interactions between the aquaculture, physical, biological and anthropogenic systems and incorporating methods to improve efficiency. Additionally, aquaculture has been used to actively restore habitats and important species, such as habitat restoration through oyster farming and hatchery operations to enhance stocks of over fished species.