phenomenon · claim-type · cross-domain-transfer · mechanism · claim-relation · replication-status · limitation — grounded in the full text| phenomenon | aquaponics - a closed loop in which fish waste feeds plants and the plants clean the water, so that the ecological weakness of each half becomes the other's input— “The system results in a symbiosis between fish, microorganisms and plants, and encourages sustainable use of water and nutrients, including their recycling ( Figure 1). Within this synergistic interaction, the respective ecological weaknesses of aquaculture and hydroponics are converted into strengths.” | |
| claim-type | critique— “The current literature cannot be used to critically assess and predict economic challenges; as presented in Table 2, only two economic sub-studies are available in the peer-reviewed literature” | |
| method — evidence | — “With respect to Table 2, it is particularly noticeable that DWC systems are mainly used, and important design parameters such as fish to plant ratio or daily feed input are sometimes missing from the literature.” | |
| object of study — evidence | — “However, there is a lack of quantitative research to support the development of economically feasible aquaponics systems. Although many studies have addressed some scientific aspects, there has been limited focus on commercial implementation.” | |
| research question — evidence | — “The purpose of this paper is to highlight current aquaponics challenges and give directions for further research. For each challenge, various approaches are described.” | |
| contribution — evidence | — “The analysis shows that aquaponics is capable of being an important driver for the development of integrated food production systems. Arid regions suffering from water stress will particularly benefit from this technology being operated in a commercial environment.” | |
| mechanism | nitrification the two-step bacterial conversion the whole system rests on: nitroso-bacteria take ammonia to nitrite, nitro-bacteria take nitrite to nitrate, and the nitrate is both far less toxic to the fish and the plants' main nitrogen source— “The ammonia within the system is converted into nitrite (NO2−) by nitroso-bacteria, before being transformed into nitrate (NO3−) by the nitro-bacteria” | mechanisms[0] |
| mechanism | pH drift two opposing forces act on system pH and one of them wins: nitrate uptake by roots RAISES pH by releasing bicarbonate, nitrification LOWERS it by producing acid, and the acid side has the larger effect, so the system drifts down continuously— “Although root uptake of nitrate raises pH as bicarbonate ions are released in exchange [49], the acidity producing nitrification process has a higher impact on the overall system pH, leading to a constant and slight decrease in the pH-value.” | mechanisms[1] |
| mechanism | carbonate solubilization the proposed fix for the drift - dissolved limestone releases hydroxide as it solubilizes, raising pH continuously at a rate set by the flow rate rather than in steps like a dosed buffer— “This water neutralization concept consists of the controlled addition of dissolved limestone (CaCO3) to the acid water that leads to a continuous pH-elevating effect due to carbonate solubilization that releases hydroxide anions (OH−).” | mechanisms[2] |
| mechanism | nutrient lock-up why the nutrients may be present and unmeasured: in aquaponic water the dissolved solids include organic molecules, and the standard measurements register only the ionic fraction— “In hydroponics, TDS consists mainly of mineral compounds, while in aquaponics it includes organic molecules wherein nutrients can be locked up and overlooked by measuring procedures such as electrical conductivity (EC) or aqueous sample filtration. Both aqueous sample filtration and the EC measurement methods only take nutrients that are… | mechanisms[3] |
| mechanism | phosphorus loss to sludge between 30% and 65% of the phosphorus entering as fish feed leaves as solid excretion and is filtered out, and what does dissolve can precipitate with calcium - which is why aquaponic phosphate sits far below the hydroponic recommendation— “In RAS, 30%–65% of the phosphorus added to the system via fish feed is lost in the form of fish solid excretion that is filtered out by either settling tanks or mechanical filters” | mechanisms[4] |
| mechanism | biofilm dependence the constraint that makes pest management hard: the system's function depends on a living nitrifying biofilm, so pesticides, antibiotics and fungicides are ruled out not by regulation but because they would kill the machinery— “Conventional pesticides that are used in hydroponics cannot be used in aquaponics because of toxicity risk to the fish and to the desired biofilm (e.g., autotrophic nitrifying biofilm)” | mechanisms[5] |
| critiques | Vermeulen and Kamstra, who found only a marginal cost reduction from aquaponics against RAS and hydroponics run separately— “Vermeulen and Kamstra [22] report only a marginal cost reduction for environmental benefits of nutrient reuse and energy efficiency when aquaponics is compared to RAS and hydroponics run separately. However, this study did not take socio-ecological factors into account, such as operating in a resource (e.g., phosphorous, water) limited world.… | claim_relations[0] |
| builds-on | Lehman et al.'s definition of sustainable agriculture as a process that depletes no non-renewable resource essential to agriculture— “Aquaponics can be considered a sustainable agricultural production system regarding the definition of Lehman et al. [10], who define sustainable agriculture as a process that does not deplete any non-renewable resources that are essential to agriculture in order to sustain the agricultural practices.” | claim_relations[1] |
| builds-on | Francis et al.'s addition that sustainable production means designing systems that close nutrient cycles— “Francis et al. [11] add that sustainable agricultural production can be achieved by resembling natural ecosystems and “designing systems that close nutrient cycles”, which is one of the main characteristics of aquaponics.” | claim_relations[2] |
| qualifies | Rakocy's finding that leafy greens are more profitable than fruity vegetables, and that basil's margin in the UVI system exceeded lettuce's by nearly four times— “In an initial economic analysis, given the University of Virgin Islands (UVI) system design, they had a profit margin with basil exceeding almost by a factor 4 of that of lettuce. This finding should be viewed with a degree of caution because of different domestic market dependencies.” | claim_relations[3] |
| qualifies | Neori et al.'s position that a zero-discharge recirculating system is achievable— “Given the objective of obtaining a low environmental footprint, a zero-discharge recirculating system concept should be achievable according to Neori et al. [52], but more research needs to be carried out on fish waste solubilization with the objective to transform all added nutrients into plant biomass.” | claim_relations[4] |
| sense | sustainable agriculture - NOT DEFINED BY THIS PAPER. It is taken whole from Lehman et al., as a process that depletes no non-renewable resource essential to agriculture, and extended with Francis et al.'s `designing systems that close nutrient cycles`. Aquaponics then qualifies BY CONSTRUCTION, because closing a nutrient cycle is what it is. The definition is borrowed and the conclusion follows from the borrowing— “Aquaponics can be considered a sustainable agricultural production system regarding the definition of Lehman et al. [10], who define sustainable agriculture as a process that does not deplete any non-renewable resources that are essential to agriculture in order to sustain the agricultural practices.” | senses[0] |
| sense | nutrient concentration, when an aquaponic solution is compared with a hydroponic one - A MEASUREMENT, NOT A QUANTITY OF NUTRIENT. Electrical conductivity and aqueous filtration see only ions, and aquaponic dissolved solids include organic molecules with nutrients locked inside them. So the aquaponic column reads lower partly because the instrument cannot see what is there - and the authors print the comparison and this objection to it on the same page— “In hydroponics, TDS consists mainly of mineral compounds, while in aquaponics it includes organic molecules wherein nutrients can be locked up and overlooked by measuring procedures such as electrical conductivity (EC) or aqueous sample filtration. Both aqueous sample filtration and the EC measurement methods only take nutrients that are… | senses[1] |
| sense | challenge, the paper's own organising word - IT COVERS TWO DIFFERENT THINGS AND THE review does not separate them. Some challenges are engineering problems with candidate solutions (pH drift, and a lime-bed reactor to fix it). Others are ABSENCES IN THE LITERATURE - two economic studies, no comparison available, parameters unreported. A reader counting `challenges` counts both kinds together— “The current literature cannot be used to critically assess and predict economic challenges; as presented in Table 2, only two economic sub-studies are available in the peer-reviewed literature” | senses[2] |
| sense | decoupled system - THE NAME FOR GIVING UP ON THE COMPROMISE. Fish, plants and nitrifying bacteria have different optimal pH and temperature, and a single loop must sit between them; a decoupled system runs two loops at their own optima and exchanges water periodically. It is presented as an alternative to the trade-off, not as an improvement to it— “the physical separation in two recirculating loops, i.e., an aquaculture and hydroponic loop, described as decoupled systems, where optimal condition for each system is applied with periodic water exchange between them.” | senses[3] |
| sense | zero-discharge recirculating system - AN OBJECTIVE, NOT A DESCRIPTION. The paper says it `should be achievable` on Neori et al.'s authority and immediately says more research is needed on the solubilization it depends on. Nothing in the review reports one running— “Given the objective of obtaining a low environmental footprint, a zero-discharge recirculating system concept should be… | senses[4] |
| control | printing Rakocy and Lennard's objection - that hydroponic and aquaponic nutrient solutions are not comparable - directly beside the table that compares them — held — rules out a reader taking the gap between the two columns as a real nutrient deficit, when part of it is an artefact of measuring only the ionic fraction of a solution that carries nutrients in organic form Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | controls[0] |
| control | reporting that some aquaponic systems match or beat hydroponic yields DESPITE the lower measured mineral concentrations — held Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. — rules out the lower concentrations being read as lower performance - the yields are the outcome and they do not follow the concentration table Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | controls[1] |
| control | naming which design parameters the published systems fail to report - fish-to-plant ratio, daily feed input - rather than presenting the comparison table as complete — held Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. — rules out the table being read as a survey of how these systems were built, when for several of them the two parameters that determine the design are simply absent from the source Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | controls[2] |
| control | stating that the reproduced costings exclude labour — held Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. — rules out the break-even and profit figures being read as complete - the review says explicitly that viability can therefore only be partially estimated Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | controls[3] |
| control | attaching a caution to Rakocy's finding that basil out-earns lettuce by nearly four times — held Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. — rules out a single system's crop-choice result being generalised, when the margin depends on a particular domestic market Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | controls[4] |
| control | naming one specific unreported variable in a study it otherwise relies on - light intensity, absent from Rakocy et al. — held Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. — rules out the two systems in the table being treated as comparable on plant yield, when a major determinant of that yield is unrecorded for one of them Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | controls[5] |
| note | Vermeulen and Kamstra, who found only a marginal cost reduction from aquaponics against RAS and hydroponics run separately — the objection is specific and it is about SCOPE, not arithmetic: the costing left out resource scarcity, and rising energy and fertilizer prices are expected to move the margin. The review does not claim the calculation was wrong Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | claim_relations[0] |
| note | Neori et al.'s position that a zero-discharge recirculating system is achievable — accepted as an objective and immediately made conditional on solubilization research that has not been done Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | claim_relations[4] |
| edge | hydroponics —part-of→ aquaponics Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[0] |
| edge | recirculating aquaculture —part-of→ aquaponics Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[1] |
| note | aquaponics —distinct-from→ hydroponics — and the difference is the nutrient source: hydroponics needs mineral fertiliser, aquaponics uses the fish water. That is why they are also in a part-of relation - aquaponics contains a hydroponic component but is not one Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[2] |
| weight | aquaponics —distinct-from→ hydroponics — 0.95 Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[2] |
| effect direction | nitrification —causes→ pH — reduces Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[3] |
| note | nitrification —causes→ pH — the winning force - the system drifts acid continuously and must be corrected Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[3] |
| weight | nitrification —causes→ pH — 0.95 Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[3] |
| audit | nitrate —causes→ pH — Audit 2026-09-28: DOUBTFUL - read against its span and kept, but the span says root uptake of nitrate raises pH; the endpoint drops 'uptake'. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[4] |
| effect direction | nitrate —causes→ pH — increases Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[4] |
| note | nitrate —causes→ pH — the losing force, in the SAME sentence as the edge above. A schema that could not sign a causal edge would record these two as identical rows Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[4] |
| weight | nitrate —causes→ pH — 0.9 Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[4] |
| effect direction | ammonia —causes→ nitrite — increases Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[5] |
| weight | ammonia —causes→ nitrite — 0.95 Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[5] |
| effect direction | nitrite —causes→ nitrate — increases Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[6] |
| weight | nitrite —causes→ nitrate — 0.95 Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[6] |
| audit | aquaponics —causes→ water — Audit 2026-09-28: DOUBTFUL - read against its span and kept, but aquaponics uses less water; the endpoint drops 'use'. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[7] |
| effect direction | aquaponics —causes→ water — reduces Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[7] |
| note | aquaponics —causes→ water — the comparison is against conventional agriculture and the paper attaches a condition to it - 'depending on the climatic conditions' Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[7] |
| weight | aquaponics —causes→ water — 0.85 Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[7] |
| outcome | control — held Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | controls[0] |
| outcome | control — held Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | controls[1] |
| outcome | control — held Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | controls[2] |
| outcome | control — held Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | controls[3] |
| outcome | control — held Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | controls[4] |
| outcome | control — held Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | controls[5] |
| no type for this | supply chain → environmental impact — LENGTH OF A CHAIN AS A COST MULTIPLIER. The longer the supply chain the more transport, packaging, conservation and labour it needs, up to 79% of retail price in US conventional distribution. 'causes' is right and the ENDPOINT is not a concept in this record - what lengthens is a chain and what grows is a bundle of costs and impacts, and there is no node for the bundle Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | unhoused_relations[0] |
| no type for this | pesticides → biofilm — A PROHIBITION, NOT A MEASURED EFFECT. Conventional pesticides cannot be used in aquaponics because they would poison the fish and the nitrifying biofilm the system depends on. 'causes ... reduces' overstates it - nobody applied them and measured a reduction; the relation is that one RULES OUT the other, and the vocabulary has no type for a constraint Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | unhoused_relations[1] |
| no type for this | electrical conductivity → organic molecules — THE MEASUREMENT THAT MISSES ITS OBJECT. Electrical conductivity and aqueous filtration register only nutrients in ionic form, so nutrients locked inside organic molecules are present and unrecorded. This is the exact negati row names: all eight edge types assert a relation HOLDS, and 'X is the measurement that FAILS to see Y' cannot be written. 'operationalised-as' would state the opposite of the truth Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | unhoused_relations[2] |
| limitation | only two economic sub-studies exist in the peer-reviewed literature, so the review states plainly that the literature cannot be used to assess economic viability at all Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[0] |
| limitation | and the one integrated comparison it does find has nothing to be compared against Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[1] |
| limitation | the design table is built from published systems that often omit the parameters that matter most - fish-to-plant ratio, daily feed input Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[2] |
| limitation | labour costs are excluded from the costings the review reproduces, so the financial picture is partial and the authors say so Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[3] |
| limitation | outside the UVI system there is little large-scale or long-duration literature, and much of what exists is a small-scale replicate of that one design - so the evidence base is narrower than its paper count suggests Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[4] |
| limitation | larger commercial systems do exist and their findings are confidential Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[5] |
| limitation | the microorganisms and the chemical and physical mechanisms of solubilization - the step the whole nutrient argument depends on - are not well understood Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[6] |
| limitation | optimal nutrient levels for leafy and fruity vegetables in aquaponics are not established, so there is no target to engineer towards Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[7] |
| limitation | the health risk from the broad microflora aquaponics deliberately maintains has not been established either Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[8] |
| limitation | no general optimum exists - the system must be fitted to local climate, geography and market, which is the review's own limit on how far any of its recommendations travel Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[9] |
finding · quantity · variable · definition · key-term — grounded in the full text| finding | The literature cannot support assessing aquaponics' economic challenges: only two economic sub-studies exist in peer-reviewed work. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[0] |
| finding | the evidence base is narrower than its paper count: outside UVI there is little large-scale or long-duration work, and much of the rest replicates that one design Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[1] |
| finding | Larger production systems are studied by private centres and companies whose findings are not always accessible. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[2] |
| finding | Some aquaponic systems report yields similar to or better than hydroponics for some crops despite lower mineral nutrient concentrations. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[3] |
| finding | the reason may be measurement: EC and filtration see only ionic nutrients, and aquaponic water carries them inside organic molecules too Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[4] |
| finding | Multi-disciplinarity - the need for economics, finance and marketing expertise - is named the biggest challenge of commercial aquaponics. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[5] |
| finding | Aquaponics trades off fish and plant needs: tilapia and nitrifying bacteria prefer 25-30 °C water, most plants 20-25 °C. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[6] |
| finding | There is no general optimal system; each must be adjusted to environmental conditions. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[7] |
| quantity | aquaponics uses under 10% of the water of conventional agriculture, which itself takes about 70% of available freshwater and up to 90% in arid regions Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.quantities[0] |
| quantity | 1 kg of beef takes 5,000-20,000 L of water; the same weight of fish in semi-intensive or extensive aquaculture takes 2,500-375,000 L Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.quantities[1] |
| quantity | recirculating aquaculture reuses 95%-99% of its water, down to below 100 L per kg of fish Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.quantities[2] |
| quantity | 30%-65% of the phosphorus entering as fish feed is filtered out as solid excretion Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.quantities[3] |
| quantity | aquaponic systems report 1-17 mg/L phosphate-P against a hydroponic recommendation of 40-60 Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.quantities[4] |
| quantity | 80% of the world's oceans are fully exploited or worse; 100 million tonnes of fish a year give 2.5 billion people at least a fifth of their animal protein Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.quantities[5] |
| quantity | distribution can reach 79% of the retail price in US conventional food supply Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.quantities[6] |
| quantity | the system pH target is 6.8-7.0, chosen as the highest value that still prevents ammonia accumulation Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.quantities[7] |
| definition | aquaponics Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.definitions[0] |
| definition | sustainable agriculture Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.definitions[1] |
| definition | sustainable agricultural production Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.definitions[2] |
| definition | decoupled systems Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.definitions[3] |
| definition | zero-discharge recirculating system Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.definitions[4] |
| concept | aquaponics Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[0] |
| concept | hydroponics Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[1] |
| concept | recirculating aquaculture Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[2] |
| concept | ammonia Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[3] |
| concept | nitrite Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[4] |
| concept | nitrate Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[5] |
| concept | nitro-bacteria Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[6] |
| concept | pH Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[7] |
| concept | nitrification Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[8] |
| concept | phosphorus Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[9] |
| concept | electrical conductivity Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[10] |
| concept | organic molecules Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[11] |
| concept | biofilm Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[12] |
| concept | pesticides Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[13] |
| concept | sustainable agriculture Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[14] |
| concept | water Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[15] |
| concept | supply chain Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[16] |
| concept | conventional agriculture Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[17] |
| concept | multi-disciplinarity Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concepts[18] |
| EVIDENCE CORRECTED (RE-GROUNDED - the project'S PROVEN CASE, 2026-08-23 22:44) · Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.statistics[0] | |
| retracted | statistic — RE-GROUNDED - the project'S PROVEN CASE, 2026-08-23 22:44. The old evidence was 'A crucial point…' - verbatim, anchored, correctly cut, and containing NOT ONE of the claim's numbers. The sentence stating the claim is two paragraphs away and is now the evidence. The claim's trailing clause 'one of the inputs to the 6.8-7.0 compromise' refers to a separate sentence and is a CROSS-REFERENCE, not part of what this quote is asked to support. | content_tags.statistics[0] |
Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.statistics[1] |
When we have changed our mind. Some entries in the table begin with a word in capitals and the reason for it. EVIDENCE CORRECTED — the finding still stands, but we had quoted the wrong sentence from the paper, and the quotation has been replaced with the right one. RETRACTED — the entry itself was wrong; it stays on the page, marked, with the reason, rather than being deleted. WITHDRAWN AND REPLACED — the entry was wrong, and a corrected version of it appears in the entries below. Each mark carries its own reason, in brackets, because the reasons differ from one entry to the next. An entry we have WITHDRAWN is removed from this page and kept in the record, with its reason. A line reading Audit and a date is a later re-reading of the entry against its whole sentence: DOUBTFUL means it was kept, and the reason says what is loose about it. Quotation marks inside the tagger's sentence. Where a tag is the tagger's own sentence, a phrase in quotation marks inside it is borrowed from the paper — the tagger's wording around it is not. The paper's own sentence is the evidence quote for that row; on this page it is withheld with the article, and the article is at its publisher. Nothing inside quotation marks anywhere on this page is ours: if it is quoted, it is the paper's. Whose words a concept carries. A concept entry records a term the paper itself uses, so the term, the sense given for it, and its evidence are the paper's own words, quoted where the paper fixes them. This is the opposite of a sense entry in the tag table, which is the tagger's sentence about how the paper uses a term. Where a concept entry could not be grounded in the paper's words, the entry says so on its own row.
Tag layer © the Meta-Tagging Project, CC BY 4.0. The paper text is © its authors/publisher
and is linked, not reproduced. Excerpts shown are short quotations for identification and verification.
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