Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 489828
Title Worm-it: converting organic wastes into sustainable fish feed by using aquatic worms
Author(s) Elissen, H.J.H.; Hendrickx, T.L.G.; Temmink, H.; Laarhoven, B.; Buisman, C.J.N.
Source Journal of Insects as Food and Feed 1 (2015)1. - ISSN 2352-4588 - p. 67 - 74.
Department(s) Environmental Technology
Publication type Refereed Article in a scientific journal
Publication year 2015
Abstract Due to overfishing and the use of one-third of wild fish catches for feeding farmed fish and livestock, there is a strong need for alternative sources of suitable proteins and lipids in fish feeds. Small freshwater worms of the species Lumbriculus variegatus can be such a source based on their high protein content, variable lipid content and amino acid pattern. In addition, their production can be combined with waste reduction, as they can be grown on safe organic wastes. In this article, it was investigated whether fatty acid (FA) profile of the worms changed with feed source. Profiles of worms grown on different feeds were highly similar, but also reflected profiles of feeds. Data suggest that the worms are capable of poly-unsaturated fatty acids bioaccumulation. The worms converted different organic wastes (fish faeces and food industry sludges) with an efficient feed conversion ratio of ~1.8 (dry to wet weight) resulting in a theoretical production of 0.1-0.14 kg of fish per kg of waste. Worm composition resembles that of other live feeds and the biomass contains important FAs. Safety of organic non-feed waste streams for worm production should be further evaluated.
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