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Higher nutrient recycling in RAS through Nereis virens

In closed recirculation systems solid waste products are usually concentrated via various mechanisms and discharged from the system. According to different authors about 15 to 20% of the given food is lost as faecal material. This particulate matter still represents a valuable source of e.g. carbon, nitrogen and phosphorous, which can be used by different organisms. Moreover, its reuse could reduce the ecological impact of aquaculture systems as well as to improve their profitability by an enhanced nutrient efficiency. One class of organisms that is known to utilize excreted nutrients in form of particulate matter are polychaetes, which additionally represent a high quality live food source for finfish and crustacean aquaculture. Therefore, this study investigates the potential of Nereis virens as a consumer of solid waste originating from European sea bass (Dicentrarchus labrax) culture, as well as their resulting amino and fatty acid to test their potential use as feed organisms in aquaculture.


 

The project was carried out mainly at the Institute for Marine Resources (IMARE GmbH) and at the Alfred-Wegener-Institute for Polar and Marine Research (AWI) but also at the University of Oldenburg, the Institute for Chemistry and Biology of the Marine Environment (ICBM) and the University of Applied Science Bremerhaven.


 
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