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Organic Matter Composition and Phosphorus Speciation of Solid Waste from an African Catfish Recirculating Aquaculture System

Author

Listed:
  • Julia Prüter

    (Soil Science, Faculty of Agricultural and Environmental Science, University of Rostock, D-18051 Rostock, Germany)

  • Sebastian Marcus Strauch

    (Department of Aquaculture and Sea-Ranching, Faculty of Agricultural and Environmental Science, University of Rostock, D-18051 Rostock, Germany)

  • Lisa Carolina Wenzel

    (Department of Aquaculture and Sea-Ranching, Faculty of Agricultural and Environmental Science, University of Rostock, D-18051 Rostock, Germany)

  • Wantana Klysubun

    (Synchrotron Light Research Institute, Muang District, 111 Moo 6 University Avenue, Nakhon Ratchasima 3000, Thailand)

  • Harry Wilhelm Palm

    (Department of Aquaculture and Sea-Ranching, Faculty of Agricultural and Environmental Science, University of Rostock, D-18051 Rostock, Germany)

  • Peter Leinweber

    (Soil Science, Faculty of Agricultural and Environmental Science, University of Rostock, D-18051 Rostock, Germany)

Abstract

Recycling of phosphorus (P) from feed input in aquaculture systems gains increasing importance, especially relating to sustainable agriculture and food production. In order to find possible areas of application of African catfish solid waste, the purpose of this study was to characterize the elemental and organic matter composition and P speciation in the aquaculture fish waste. Pyrolysis-field ionization mass spectrometry (Py-FIMS) was used to investigate the composition of organic matter and P K -edge X-ray absorption near edge structure (XANES) spectroscopy to describe the occurring P-containing compounds in African catfish solid waste from an intensive recirculation aquaculture system (RAS). The solid fish waste was mainly composed of sterols, free fatty acids and alkylaromatics, as it is common for digestive systems of animals. Ingredients such as the phytosterol beta-sitosterin confirm plant-based feed ingredients and some recalcitrance against digestion in the African catfish gut. The P in the solid fish waste was exclusively bound as calcium-phosphates. These calcium-phosphate minerals as major constituents of African catfish waste may have beneficial effects when applied to soils, suggesting the use of this waste as possible soil amendment in the future.

Suggested Citation

  • Julia Prüter & Sebastian Marcus Strauch & Lisa Carolina Wenzel & Wantana Klysubun & Harry Wilhelm Palm & Peter Leinweber, 2020. "Organic Matter Composition and Phosphorus Speciation of Solid Waste from an African Catfish Recirculating Aquaculture System," Agriculture, MDPI, vol. 10(10), pages 1-14, October.
    • Handle: RePEc:gam:jagris:v:10:y:2020:i:10:p:466-:d:426077
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    References listed on IDEAS

    as
    1. Sebastian Marcus Strauch & Lisa Carolina Wenzel & Adrian Bischoff & Olaf Dellwig & Jan Klein & Andrea Schüch & Berit Wasenitz & Harry Wilhelm Palm, 2018. "Commercial African Catfish ( Clarias gariepinus ) Recirculating Aquaculture Systems: Assessment of Element and Energy Pathways with Special Focus on the Phosphorus Cycle," Sustainability, MDPI, vol. 10(6), pages 1-29, May.
    2. Paul J. A. Withers & Donnacha G. Doody & Roger Sylvester-Bradley, 2018. "Achieving Sustainable Phosphorus Use in Food Systems through Circularisation," Sustainability, MDPI, vol. 10(6), pages 1-17, May.
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