Details

Autor(en) / Beteiligte

• Hambly, A.C.
• Arvin, E.
• Pedersen, L.-F.
• Pedersen, P.B.
• Seredyńska-Sobecka, B.
• Stedmon, C.A.

Titel

Characterising organic matter in recirculating aquaculture systems with fluorescence EEM spectroscopy

Ist Teil von

• Water research (Oxford), 2015-10, Vol.83, p.112-120

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2015

Quelle

ScienceDirect

Beschreibungen/Notizen

• The potential of recirculating aquaculture systems (RAS) in the aquaculture industry is increasingly being acknowledged. Along with intensified application, the need to better characterise and understand the accumulated dissolved organic matter (DOM) within these systems increases. Mature RASs, stocked with rainbow trout and operated at steady state at four feed loadings, were analysed by dissolved organic carbon (DOC) analysis and fluorescence excitation-emission matrix (EEM) spectroscopy. The fluorescence dataset was then decomposed by PARAFAC analysis using the drEEM toolbox. This revealed that the fluorescence character of the RAS water could be represented by five components, of which four have previously been identified in fresh water, coastal marine water, wetlands and drinking water. The fluorescence components as well as the DOC showed positive correlations with feed loading, however there was considerable variation between the five fluorescence components with respect to the degree of accumulation with feed loading. The five components were found to originate from three sources: the feed; the influent tap water (groundwater); and processes related to the fish and the water treatment system. This paper details the first application of fluorescence EEM spectroscopy to assess DOM in RAS, and highlights the potential applications of this technique within future RAS management strategies. [Display omitted] •First OM characterisation of recirculating aquaculture systems (RAS) by fluorescence EEM spectroscopy.•PARAFAC analysis showed a 5-component model to describe RAS water.•Components are linked to 3 sources of FDOM: feed; influent water; and fish/treatment processes.•Each fluorescence component showed a different relationship to feed input level.•FDOM gave a more specific approach than DOC to monitor OM changes in RAS.