PhD theses

All Wageningen University PhD theses

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    Wageningen PhD theses

    This database contains bibliographic descriptions of all Wageningen University PhD theses from 1920 onwards. It is updated on a daily basis by WUR Library.

    Author abstracts and/or summaries are added to all descriptions. A link to the full text dissertation is added to the bibliographic description. In a few cases, no electronic version is available, mostly because of copyright issues.

    Hard copies of all theses are available for loan at WUR Library. To request them, click the link Request this publication in the full record presentation. This is a fee based service.

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Valorisation of waste streams from by-product to worm biomass [PhD thesis]
Laarhoven, Bob \ 2017
biomass - residual streams - animal nutrition - fisheries - organic wastes - helminths

With an 8 % annual growth rate, aquaculture is the fastest growing food production sector in the world (FAO, 2008). It can only be sustainable if it is supported by a similar increase in feed production. This had led to several developments to reduce and replace the amount of fishmeal/ oil in fish diets by plant based ingredients originating from by-products or from crops specifically cultured for this purpose. Although plant oils and proteins are available in bulk amounts, their application in fish feed is questionable as it induces more pressure on land-use due to increased agricultural production and competes with present use as food or feed. This drives several alternative feed source developments which are based on the use of residual streams. Novel feed ingredients based on residual stream conversion can in general be subdivided into two major classes: Single cell protein, mainly from yeast, microalgae and bacteria. These novel feed ingredients have the potential to be more sustainable than fish and plant based proteins/oils if they can be effectively produced from residual nutrients, waste streams or low value by-products from e.g. food or agro industries.

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