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Jijakli Haissam – One of the best experts on this subject based on the ideXlab platform.

  • L’eau aquponique, une nouvelle source d’agents de biocontrôle contre la pourriture racinaire des laitues causée par Pythium aphanidermatum
    , 2020
    Co-Authors: Stouvenakers Gilles, Massart Sébastien, Jijakli Haissam

    Abstract:

    audience: researcher, professional, student, popularization, otherIn Aquaponics, phytosanitary treatments for plant diseases management are a delicate matter because of the presence of fish. However, it appears that aquaponic systems could be naturally armed against plant pathogens. This natural protective action is called suppressiveness. Aquaponic water has shown a direct inhibitory effect on in vitro Pythium spp. growth (Gravel et al. 2015; Sirakov et al. 2016; Stouvenakers et al. 2018). To confirm this discovery, in vivo experiments using Pythium aphanidermatum have been carried out on lettuces growing in hydroponic (HP) water, aquaponic (AP) water or aquaponic water complemented (COMP) with mineral nutrients to reach HP levels. Suppressiveness property of AP, COMP and HP waters was evaluated by comparing root symptoms and lettuces yields. For each treatments, lettuces root microbiota were analysed after Illumina high throughput sequencing of ITS and 16S rDNA genes. Results showed that yields and roots health of AP lettuces were significantly better compared to COMP and HP lettuces. The bioinformatics analysis of sequenced microbiota showed differences in terms of microbiota diversity and features composition when comparing AP with COMP and HP water. These results highlight that the physicochemical modifications of the AP water to make the COMP water disturb the AP microbiota and lead to the loss of its suppressive capacity. Moreover, AP could be an interesting source of novel biocontrol agents for plant pathogens control in Aquaponics

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  • L’eau aquponique, une nouvelle source d’agents de biocontrôle contre la pourriture racinaire des laitues causée par Pythium aphanidermatum
    , 2020
    Co-Authors: Stouvenakers Gilles, Massart Sébastien, Jijakli Haissam

    Abstract:

    In Aquaponics, phytosanitary treatments for plant diseases management are a delicate matter because of the presence of fish. However, it appears that aquaponic systems could be naturally armed against plant pathogens. This natural protective action is called suppressiveness. Aquaponic water has shown a direct inhibitory effect on in vitro Pythium spp. growth (Gravel et al. 2015; Sirakov et al. 2016; Stouvenakers et al. 2018). To confirm this discovery, in vivo experiments using Pythium aphanidermatum have been carried out on lettuces growing in hydroponic (HP) water, aquaponic (AP) water or aquaponic water complemented (COMP) with mineral nutrients to reach HP levels. Suppressiveness property of AP, COMP and HP waters was evaluated by comparing root symptoms and lettuces yields. For each treatments, lettuces root microbiota were analysed after Illumina high throughput sequencing of ITS and 16S rDNA genes. Results showed that yields and roots health of AP lettuces were significantly better compared to COMP and HP lettuces. The bioinformatics analysis of sequenced microbiota showed differences in terms of microbiota diversity and features composition when comparing AP with COMP and HP water. These results highlight that the physicochemical modifications of the AP water to make the COMP water disturb the AP microbiota and lead to the loss of its suppressive capacity. Moreover, AP could be an interesting source of novel biocontrol agents for plant pathogens control in Aquaponics

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  • Development of a generalist, integrative and predictive model for Aquaponics within the European “Smart Aquaponics” project
    , 2019
    Co-Authors: Stalport Benoît, Raulier Pierre, De Cock Nicolas, Lebeau Frédéric, Jijakli Haissam

    Abstract:

    audience: researcher, professional, studentAquaponics is the association of fish and plant farming, exploiting the natural phenomenon observed in aquatic ecosystems. The microbiota transforms the fish waste into different chemical forms that are less toxic for fish and very suited for hydroponic plants culture. Due to its recent and quick development, Aquaponics can now be found in a variety of areas of interest such as personal installations, education fields, private and public research projects and reached nowadays the food production at medium and large scales industries.
    The diversity found in these installations makes it difficult to identify the mechanisms that rule Aquaponics and to generalize the findings to other systems. Few researches established the equations that govern the behaviour of one particular system, in order to estimate the productions and to apply sensitivity analysis. These models often satisfy the goals of the developers but cannot be applied to different system setups.
    In this context, a generalist model is being developed for Aquaponics. The equations are based on aquaculture, hydroponics and Aquaponics researches and are implemented using an object-oriented programming in order to generate a completely generic model. The European Smart Aquaponics Project provides numerous systems with different architectures. All these installations are equipped with a full set of Aquaponics sensors to generate a strong aquaponic database that will be used for model development.
    The computed outputs are various and new ones are regularly added to keep pace with the continuous development of Aquaponics. In this case study, the model has been applied to an experimental setup to illustrate the basic calculated parameters such as the dynamical behaviours of: the water volumes and several nutrient concentrations, the vegetal and animal biomasses, the water consumption, a few economic criteria, etc

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Delaide Boris – One of the best experts on this subject based on the ideXlab platform.

  • Etude des éléments minéraux disponibles en aquaponie, de leur impact sur la productivité des laitues et de la potentielle amélioration de leur disponibilité.
    Université de Liège ​Liège ​​Belgique, 2017
    Co-Authors: Delaide Boris

    Abstract:

    Aquaponics is an integrated farming concept that combines fish and hydroponic plant production in a recirculating water system. This innovative technique has the potential to reduce the impact of fish and plant production on the environment by namely closing the nutrient loop. Indeed, the nutrients leaving the fish part are used to grow hydroponic plants.
    This thesis focused on the mineral elements available in Aquaponics to grow plants. The thesis started by deepening the aquaponic concept. It was identified that the mineral elements available for plants growth in solution were lower concentrated than in hydroponics. It was assumed that an important parts of the nutrients input were unavailable and lost out of the aquaponic system via sludge spillage. This leaded to the necessity to determine the consistency of the plant growth and the proportion of mineral elements that were recycled in aquaponic systems. A solution to improve the recycling of these elements and increase their availability was also studied. Therefore, the performances of a one loop aquaponic system named the plant and fish farming box (PAFF Box), in terms of yields of fish and plant, energy and water consumption, and mineral elements mass balances were studied. The mineral nutritive elements were also characterised. For experimentation convenience, lettuce was taken as a model plant. To determine if Aquaponics can assure consistent plant growth compared to conventional systems, lettuce growth has been compared between a one loop aquaponic solution, a hydroponic solution and a complemented aquaponic solution in deep water systems in controlled conditions. The latest allowed studying also the growth when nutrient concentrations are increased in the aquaponic solution. The potential of improvement of nutrient recycling for increasing their availability to plant by sludge digestion onsite was studied. Therefore, the mineralisation performance of sludge has been explored in simple aerobic and anaerobic reactors and in up-flow anaerobic sludge blanket reactors (UASB).
    In the term of this work, it appeared that Aquaponics consumed and discharged less water to produce fish and plant but required more energy than conventional farming systems. The lettuce showed similar growth performance between aquaponic and hydroponic solution but significantly higher growth (i.e. 39% fresh mass increase) in complemented aquaponic solution. This indicated that lower mineral elements concentrations did not impact negatively plant growth and that an increase of concentrations improved growth compared to conventional hydroponics. Also the microorganisms and dissolved organic matter may play an important role for promoting plant roots and shoots growth in Aquaponics. Mineral elements mass balances analysis showed that an important part of the elements were accumulating in sludge and lost by water and sludge spillage. However, the sludge digestion onsite showed promising results to recover these elements in available form for plants. It would allow reducing environmental footprints by limiting the nutrients loss and recycle even more water. Regarding these results an improvement of the one loop aquaponic system was suggested as a hybrid decoupled aquaponic system that would limit water and nutrients discharge and improve plant growth

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  • Etude des éléments minéraux disponibles en aquaponie, de leur impact sur la productivité des laitues et de la potentielle amélioration de leur disponibilité.
    Université de Liège ​Liège ​​Belgique, 2017
    Co-Authors: Delaide Boris

    Abstract:

    audience: researcher, professional, studentAquaponics is an integrated farming concept that combines fish and hydroponic plant production in a recirculating water system. This innovative technique has the potential to reduce the impact of fish and plant production on the environment by namely closing the nutrient loop. Indeed, the nutrients leaving the fish part are used to grow hydroponic plants.
    This thesis focused on the mineral elements available in Aquaponics to grow plants. The thesis started by deepening the aquaponic concept. It was identified that the mineral elements available for plants growth in solution were lower concentrated than in hydroponics. It was assumed that an important parts of the nutrients input were unavailable and lost out of the aquaponic system via sludge spillage. This leaded to the necessity to determine the consistency of the plant growth and the proportion of mineral elements that were recycled in aquaponic systems. A solution to improve the recycling of these elements and increase their availability was also studied. Therefore, the performances of a one loop aquaponic system named the plant and fish farming box (PAFF Box), in terms of yields of fish and plant, energy and water consumption, and mineral elements mass balances were studied. The mineral nutritive elements were also characterised. For experimentation convenience, lettuce was taken as a model plant. To determine if Aquaponics can assure consistent plant growth compared to conventional systems, lettuce growth has been compared between a one loop aquaponic solution, a hydroponic solution and a complemented aquaponic solution in deep water systems in controlled conditions. The latest allowed studying also the growth when nutrient concentrations are increased in the aquaponic solution. The potential of improvement of nutrient recycling for increasing their availability to plant by sludge digestion onsite was studied. Therefore, the mineralisation performance of sludge has been explored in simple aerobic and anaerobic reactors and in up-flow anaerobic sludge blanket reactors (UASB).
    In the term of this work, it appeared that Aquaponics consumed and discharged less water to produce fish and plant but required more energy than conventional farming systems. The lettuce showed similar growth performance between aquaponic and hydroponic solution but significantly higher growth (i.e. 39% fresh mass increase) in complemented aquaponic solution. This indicated that lower mineral elements concentrations did not impact negatively plant growth and that an increase of concentrations improved growth compared to conventional hydroponics. Also the microorganisms and dissolved organic matter may play an important role for promoting plant roots and shoots growth in Aquaponics. Mineral elements mass balances analysis showed that an important part of the elements were accumulating in sludge and lost by water and sludge spillage. However, the sludge digestion onsite showed promising results to recover these elements in available form for plants. It would allow reducing environmental footprints by limiting the nutrients loss and recycle even more water. Regarding these results an improvement of the one loop aquaponic system was suggested as a hybrid decoupled aquaponic system that would limit water and nutrients discharge and improve plant growth

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Stouvenakers Gilles – One of the best experts on this subject based on the ideXlab platform.

  • L’eau aquponique, une nouvelle source d’agents de biocontrôle contre la pourriture racinaire des laitues causée par Pythium aphanidermatum
    , 2020
    Co-Authors: Stouvenakers Gilles, Massart Sébastien, Jijakli Haissam

    Abstract:

    audience: researcher, professional, student, popularization, otherIn Aquaponics, phytosanitary treatments for plant diseases management are a delicate matter because of the presence of fish. However, it appears that aquaponic systems could be naturally armed against plant pathogens. This natural protective action is called suppressiveness. Aquaponic water has shown a direct inhibitory effect on in vitro Pythium spp. growth (Gravel et al. 2015; Sirakov et al. 2016; Stouvenakers et al. 2018). To confirm this discovery, in vivo experiments using Pythium aphanidermatum have been carried out on lettuces growing in hydroponic (HP) water, aquaponic (AP) water or aquaponic water complemented (COMP) with mineral nutrients to reach HP levels. Suppressiveness property of AP, COMP and HP waters was evaluated by comparing root symptoms and lettuces yields. For each treatments, lettuces root microbiota were analysed after Illumina high throughput sequencing of ITS and 16S rDNA genes. Results showed that yields and roots health of AP lettuces were significantly better compared to COMP and HP lettuces. The bioinformatics analysis of sequenced microbiota showed differences in terms of microbiota diversity and features composition when comparing AP with COMP and HP water. These results highlight that the physicochemical modifications of the AP water to make the COMP water disturb the AP microbiota and lead to the loss of its suppressive capacity. Moreover, AP could be an interesting source of novel biocontrol agents for plant pathogens control in Aquaponics

    Free Register to Access Article

  • L’eau aquponique, une nouvelle source d’agents de biocontrôle contre la pourriture racinaire des laitues causée par Pythium aphanidermatum
    , 2020
    Co-Authors: Stouvenakers Gilles, Massart Sébastien, Jijakli Haissam

    Abstract:

    In Aquaponics, phytosanitary treatments for plant diseases management are a delicate matter because of the presence of fish. However, it appears that aquaponic systems could be naturally armed against plant pathogens. This natural protective action is called suppressiveness. Aquaponic water has shown a direct inhibitory effect on in vitro Pythium spp. growth (Gravel et al. 2015; Sirakov et al. 2016; Stouvenakers et al. 2018). To confirm this discovery, in vivo experiments using Pythium aphanidermatum have been carried out on lettuces growing in hydroponic (HP) water, aquaponic (AP) water or aquaponic water complemented (COMP) with mineral nutrients to reach HP levels. Suppressiveness property of AP, COMP and HP waters was evaluated by comparing root symptoms and lettuces yields. For each treatments, lettuces root microbiota were analysed after Illumina high throughput sequencing of ITS and 16S rDNA genes. Results showed that yields and roots health of AP lettuces were significantly better compared to COMP and HP lettuces. The bioinformatics analysis of sequenced microbiota showed differences in terms of microbiota diversity and features composition when comparing AP with COMP and HP water. These results highlight that the physicochemical modifications of the AP water to make the COMP water disturb the AP microbiota and lead to the loss of its suppressive capacity. Moreover, AP could be an interesting source of novel biocontrol agents for plant pathogens control in Aquaponics

    Free Register to Access Article