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In the last years considerable attention has been paid on the use of seaweeds (SW) as a possible ingredient for aquafeeds. Red, green and brown SW can be taken from their natural habitat and brought to the shore by the action of winds and tides. Otherwise, biomass can be obtained from secondary and tertiary treatment of effluents. Wastewater treatment utilising photosynthetic organisms is an interesting alternative to reduce the ecological impact of domestic, industrial or aquaculture effluents. Generally, high-quality algal biomass is yielded from algal cultivation, representing an excellent source of hydrocolloids, carotenoids, and bioactive substances, which allows different industrial applications. In addition, there is currently an increasing interest for the potential of SW in human and animal nutrition.