Particulate waste management and removal is one of the most problematic parts of recirculation aquaculture systems (RAS). Particulate waste and thereby turbidity originates from three major sources: fish (faeces), feed and biofilm (heterotrophic bacteria and fungi). Based on size and density there are roughly four categories of particulate waste: settable, suspended, floatable and fine or dissolved solids. Specific problems related to high turbidity are a decreasing feed intake by fish, causing lower growth and increasing feed loss; an increasing risk regarding pathogens increasing disease problems and gill irritation; a higher oxygen consumption of the system and more complicate visual observation of fish, which is a necessity for good farm management. Good particulate matter and turbidity control is one of the key factors determining the success of RAS. The goal of this task is to get a better understanding of the nature of turbidity and the role of the different water treatment units within RAS and finally find ways to achieve a better control of turbidity.
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