Biofloc technology : a new concept to produce feed to Swedish aquaculture
Abstract: The aquaculture provides many people with fish and it will increase in scale. To provide the fish with feed that is not a load on the environment the use of microbes as feed either filtrated directly from the water or recovered to become protein meal is very promising. Biofloc technology (BFT) is one method with filtration directly from water. It has traditionally been used in outdoor ponds that contain naturally photoautotrophic algae that provides the water with oxygen and becomes an additional food source to herbivorous and omnivorous species. BFT have shown to reduce feeding costs, maintain water quality and to help to control bacterial infections in the pond. To maintain a better water stability, BFT could be applied indoors, then sunlight becomes restrained and instead of algae, heterotrophic bacteria will dominate. The aim of this literature review was to see if this technology could have potential in Swedish aquaculture that have a colder climate. When higher water temperature can be held during all seasons, it makes it possible to grow tropical fish species. It is possible to have indoor tanks in Sweden, where fish and shrimps can grow in BFT systems. It would decrease the environmental load and an opportunity to take full responsibility for waste material and substances from the water.
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