Floating faeces for a cleaner fish production

Recent developments in European recirculating aquaculture systems suggest expanding potential for this extremely water-efficient technique. However, the technology still faces challenges due to concerns over economic efficiency and system stability - both essential in minimizing the risk of financia...

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Autores principales:	J Unger, M Schumann, A Brinker
Formato:	article
Lenguaje:	EN
Publicado:	Inter-Research 2015
Materias:	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/57ed8374e8744034ad9de794c94faff3
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spelling	oai:doaj.org-article:57ed8374e8744034ad9de794c94faff32021-11-16T09:43:45ZFloating faeces for a cleaner fish production1869-215X1869-753410.3354/aei00147https://doaj.org/article/57ed8374e8744034ad9de794c94faff32015-10-01T00:00:00Zhttps://www.int-res.com/abstracts/aei/v7/n3/p223-238/https://doaj.org/toc/1869-215Xhttps://doaj.org/toc/1869-7534Recent developments in European recirculating aquaculture systems suggest expanding potential for this extremely water-efficient technique. However, the technology still faces challenges due to concerns over economic efficiency and system stability - both essential in minimizing the risk of financially and environmentally expensive failures. One key factor in maintaining stable production conditions in a recirculation loop is the effective removal of solid waste, i.e. fish faeces. This study tested a novel approach for solid control and demonstrates the value-adding potential of floating faeces under commercial conditions in a semi-recirculating fish farm in Germany. A commercial control diet was compared with an experimental diet in which the addition of 2.5% cork granules led to the production of floating faeces. Physiological assays indicated no pathologic tissue alterations associated with the experimental feed, and growth, survival and feed conversion were unaffected. Average single-pass removal by a specially developed surface separator accounted for 78.3% of floating solids which accounted for 35.4% of total system solids. Total ammonia nitrogen concentrations in production water were roughly halved, from about 0.95 mg l-1 in the control to 0.47 mg l-1 using the cork diet, an improvement that in practice allowed a doubling of production on the same available water flow. This study shows that the application of floating faeces facilitates rapid and cost-effective removal of suspended solids, resulting in a considerable decrease of nutrient load in system and discharge water of the investigated farm.J UngerM SchumannA BrinkerInter-ResearcharticleAquaculture. Fisheries. AnglingSH1-691EcologyQH540-549.5ENAquaculture Environment Interactions, Vol 7, Iss 3, Pp 223-238 (2015)
institution	DOAJ
collection	DOAJ
language	EN
topic	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5
spellingShingle	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5 J Unger M Schumann A Brinker Floating faeces for a cleaner fish production
description	Recent developments in European recirculating aquaculture systems suggest expanding potential for this extremely water-efficient technique. However, the technology still faces challenges due to concerns over economic efficiency and system stability - both essential in minimizing the risk of financially and environmentally expensive failures. One key factor in maintaining stable production conditions in a recirculation loop is the effective removal of solid waste, i.e. fish faeces. This study tested a novel approach for solid control and demonstrates the value-adding potential of floating faeces under commercial conditions in a semi-recirculating fish farm in Germany. A commercial control diet was compared with an experimental diet in which the addition of 2.5% cork granules led to the production of floating faeces. Physiological assays indicated no pathologic tissue alterations associated with the experimental feed, and growth, survival and feed conversion were unaffected. Average single-pass removal by a specially developed surface separator accounted for 78.3% of floating solids which accounted for 35.4% of total system solids. Total ammonia nitrogen concentrations in production water were roughly halved, from about 0.95 mg l-1 in the control to 0.47 mg l-1 using the cork diet, an improvement that in practice allowed a doubling of production on the same available water flow. This study shows that the application of floating faeces facilitates rapid and cost-effective removal of suspended solids, resulting in a considerable decrease of nutrient load in system and discharge water of the investigated farm.
format	article
author	J Unger M Schumann A Brinker
author_facet	J Unger M Schumann A Brinker
author_sort	J Unger
title	Floating faeces for a cleaner fish production
title_short	Floating faeces for a cleaner fish production
title_full	Floating faeces for a cleaner fish production
title_fullStr	Floating faeces for a cleaner fish production
title_full_unstemmed	Floating faeces for a cleaner fish production
title_sort	floating faeces for a cleaner fish production
publisher	Inter-Research
publishDate	2015
url	https://doaj.org/article/57ed8374e8744034ad9de794c94faff3
work_keys_str_mv	AT junger floatingfaecesforacleanerfishproduction AT mschumann floatingfaecesforacleanerfishproduction AT abrinker floatingfaecesforacleanerfishproduction
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Floating faeces for a cleaner fish production

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