Characterizing changes of dissolved organic matter composition with the use of distinct feeds in recirculating aquaculture systems via high-resolution mass spectrometry

• DOI: 10.1016/j.scitotenv.2020.142326
• Publication Date: 2020-09-13T05:36:26Z
• Authors: Patricia Aguilar-...; Susana V. Gonzalez; Mads A. Simonsen; Ana R. Borrero-Sa...; Josep Sanchís; Andre Meriac; Jelena Kolarevic; Alexandros G. Asi...; Øyvind Mikkelsen
• Keywords: Recirculating aquaculture system

Recirculating aquaculture systems (RAS) are a new alternative to traditional approaches, allowing full control over the fish production conditions, while reducing water demand. The reduction of exchange leads an accumulation dissolved organic matter (DOM) that can have potential effects on quality, welfare and system performance. Despite growing awareness DOM in aquaculture, scarce scientific information exists for understanding composition transformation RAS. In this study, non-targeted approach using ultra-performance liquid chromatography coupled hybrid quadrupole-time flight mass spectrometer (UPLC-QTOF-MS) was used characterize compositional changes low molecular weight (LMW) RAS, when operated under two different feed types. A total 1823 chemicals were identified majority those contained CHON chemical group their structure. Changes LMW-DOM RAS waters observed standard switched feed. with use feed, consisted mainly lignin/CRAM-like, CHO CHOS groups, composed by unsaturated hydrocarbon, CHNO CHNOS groups. Bray-Curtis dissimilarity cluster demonstrated differences from associated type used. When used, Kendrick defect plots –CH2- homologous units pump-sump (after treatment) showed high removal capacity CHNO, halogenated defect, KMD > 0.7. To our knowledge, is first report characterization high-resolution spectrometry (HRMS).