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Aquaculture Environment Interactions

    AEI prepress abstract   -  DOI: https://doi.org/10.3354/aei00424

    Transformation of phosphorus in an experimental integrated multitrophic aquaculture system using the media filled beds method in plant cultivation

    Agnieszka Tórz*, Marlena Burda, Mirosław Półgęsek, Jacek Sadowski, Arkadiusz Nędzarek

    *Corresponding author:

    ABSTRACT: The objective of the study was to trace the transformations of phosphorus in an integrated multi-trophic aquaculture (IMTA) system and to determine whether the method of plant breeding influences the dynamics of these changes. In the experiment performed, the media filled beds (MFB) method in plant cultivation was applied. Fish tanks were stocked with 200 common carp Cyprinus carpio and hydroponic terraces were planted with 49 zantedeschia Zantedeschia sp. bulbs. The parameters were determined on a weekly basis over a period of 3 mo according to commonly adopted methods. Water samples for the analyses were taken directly from the fish tank locations directly after each type of filtration (mechanical, biological and hydroponic). The basic forms of orthophosphates in the IMTA system were some H2PO4- ions but mostly HPO42-. The higher supply of reactive phosphorus that occurred over time in the experiment may have contributed to a decrease in calcium ion concentration due to the formation of Ca3(PO4)2 and CaHPO4 salts, thus inactivating some of the phosphorus available to plants. Phosphorus may have also been inactivated in the sediment due to the formation of Mg3(PO4)2 and MgHPO4 salts in the second phase of the experiment. Mineralization of organic matter took place under aerobic conditions. Organic matter was a source of biogenic substances in the IMTA system. Experimental results show that IMTA systems have significant potential to reduce phosphorus nutrients accumulated in aquaculture wastewater and thus provide a good environment for fish farming, contributing to water quality.