В работе рассматриваются особенности внедрения инновационной информационной системы SAP IBP на примере конкретного предприятия «Колбасный завод». В работе проведен анализ ИТ рынка для сравнения существующих систем релевантных для процесса оптимизации бизнес – процессов, подробно рассмотрена система SAP IBP, а также ее применимость с точки зрения оптимизации бизнес – планирования на предприятии. Также, были рассмотрены эффекты от внедрения ИТ системы и положительные тенденции для бизнеса. Была рассчитана экономическая эффективность внедрения системы и описано внедрение ИТ проекта. / In this work we describe the features of the implementation of the SAP IBP system on the example of a "Sausage Plant". In the work were made an analysis in the IT market to compare systems relevant to the process of optimizing business processes, discusses in detail the SAP IBP system, as well as its applicability from the point of view of optimizing business planning at the enterprise. Also, the effects of the implementation of the IT system and positive trends for business were considered, economic efficiency of the system implementation was calculated and the implementation of the IT project was described.

Our modern “traditional” agricultural system is not sustainable. This system is highly dependent on limited resources such as land, oil and water. It also has numerous negative impacts, including the depletion of resources leading to higher prices, pollutions leading to health risks, global warming, deforestation and biodiversity loss. These dependencies and consequences are combined with a growing and ever more affluent global population which requires greater amount of resources to support its growth and which increases the negative impacts on the environment. All indicates that our system is reaching its limits and that there is a need for new solutions. This research introduces the general context (problem and existing research) and explores an alternative, namely: Intensive Vertical Urban Agriculture (I.V.U.A.). This method seems to offer two particularly interesting promises beneficial for Sustainable Urban Development: the reduction of transportation, and the integration of food production in the urban nutrient and energy cycles. However, to achieve these potential benefits the technology (in a broad sense) has to meet several challenges and there is a need for further experimentation. This study explores challenges of I.V.U.A. and key factors enabling or hindering experimentation in this field. This investigation identified key barriers to further development of I.V.U.A. through the use of a case study. The Plantagon International ABis a unique project which will be built in 2013, in Linkoping, Sweden. It will be the first vertical greenhouse of a considerable scale in the world with a research and commercial aim. Barriers to I.V.U.A. were identified as: - Lack of awareness about the problems with our modern food supply, and hence missed opportunities for S.U.D. - Attitudes that are working against I.V.U.A. and competition for recognition with other forms of agriculture as alternative to the problem of food production - Lack of technical abilities, knowledge and skills in I.V.U.A. - Funding/supporting infrastructures (physical or informational) - Blockages that are the result of administrations and policies which are largely based around “traditional” agriculture. Finally, a set of recommendations was drawn from the interviews of the case study and the literature review, to help planners and decision-makers lift these barriers and enable experimenting. These four implications to consider and explore are: - Gaining understanding of the complexity of S.U.D.problems and the need for a wide range of solutions which include I.V.U.A.; - Including a greater amount of stakeholders, and considering contexts - Improving access to land but also to resources and infrastructures - Building support to enable I.V.U.A. to thrive on its own

The food production rate is required to increase in order to meet the ever-increasing world population. At the same time, this needs to be done in a sustainable manner as the agriculture sector today is responsible for a substantial part of the annual carbon dioxide emissions associated with human activities. In this study, eight farmers in the Swedish agricultural sector whose businesses are primarily based on cultivation and crop production, were interviewed. This to get an understanding of farmers ́ view on connectivity and data, and how this could enable a more productive and sustainable sector in the future.  The study has identified future scenarios that have the potential of contributing to a sustainable development of the sector which are enabled by data and a more connected agriculture sector. One scenario is about fleets of small, connected autonomous agricultural units enabling the electrification transformation of the sector. This will allow for small-scale farms focusing on quality to have great positive impact on the food supply and the sustainability development of the sector. A second scenario is to, with the help of data, make it easier to establish a true consumer value for sustainable products or those of good quality and thereby enable consumers to budget their environmental impact related to food from arable land. In order for this to become feasible a third scenario is related to the agricultural ecosystem which needs to come together and find solutions for data management, creating systems for data handling and analytics to be used both by the farmers and decision makers. With this in place a fourth scenario will be feasible where laws, regulations, and subsidies of today could transform from a generic approach into a more area-based system taking local conditions, determined by data, from individual farms into consideration. There are few contradictions between sustainability and profitability from a farmer ́s point of view and with the help of data and a more connected agriculture, the sector could develop in a positive direction and increase the food production in a sustainable manner. / Produktionen av livsmedel behöver öka för att möta den ständigt ökande världsbefolkningen. Samtidigt måste detta göras på ett hållbart sätt, eftersom jordbrukssektorn redan idag bidrar med en betydande del av de årliga koldioxidutsläppen från mänskliga aktiviteter. I den här studien intervjuades åtta jordbrukare i den svenska jordbrukssektorn med inriktning på odling och produktion av grödor. Detta för att få en förståelse för jordbrukarnas syn på uppkoppling och data, samt hur detta skulle möjliggöra en mer produktiv och hållbar sektor i framtiden.  Studien har identifierat några framtidsscenarier som har potential att bidra till en hållbar utveckling av sektorn och som möjliggörs av data och en mer kopplad jordbrukssektor. Ett scenario handlar om flottor av små, uppkopplade autonoma jordbruksenheter som i sin tur möjliggör en elektrifieringstransformation av sektorn. Detta gör det möjligt för småskaliga jordbruk med fokus på kvalitet att få stor positiv inverkan på livsmedelsförsörjningen och jordbrukssektorns hållbarhetsutveckling. Ett andra scenario är att med hjälp av data göra det lättare att skapa ett verkligt konsumentvärde för hållbara produkter eller produkter av god kvalitet och därigenom göra det möjligt för konsumenterna att budgetera sin miljöpåverkan relaterad till mat från åkermark. För att detta ska bli verklighet krävs ett tredje scenario som innebär att ekosystemet inom jordbrukssektorn måste komma samman och hitta lösningar för datahantering, skapa system för dataanvändning och analys som i sin tur blir användbar både av jordbrukare och beslutsfattare. Med detta på plats kommer ett fjärde scenario att vara genomförbart där dagens generiska lagar, regleringar och subventioner kan förvandlas till ett mer områdesbaserat system där direkt hänsyn kan tas till lokala förhållanden, baserat på data från enskilda gårdar. Det finns få motsättningar mellan hållbarhet och lönsamhet ur jordbrukarnas synvinkel och med hjälp av data och ett mer uppkopplat jordbruk kan sektorn utvecklas i en positiv riktning och öka livsmedelsproduktionen på ett hållbart sätt.

The story of phosphorus began with the search for the philosopher’s stone, and centuries later the critical role of phosphorus in soil fertility and crop growth was highlighted. Eventually, phosphorus was implicated in the global environmental challenge of eutrophication. Now, we are on the brink of yet another emerging chapter in the story: global phosphorus scarcity linked to food security. Through a transdisciplinary and systemic inquiry, this thesis has analyzed, reconceptualized and synthesized the physical and institutional dimensions of global phosphorus scarcity in the context of food security, leading to a new framing, ‘phosphorus security’ to guide future work towards a more sustainable and food secure pathway. In a world which will be home to nine billion people by the middle of this century, producing enough food and other vital resources is likely to be a substantial challenge for humanity. Phosphorus, together with nitrogen and potassium, is an essential plant nutrient. It is applied to agricultural soils in fertilizers to maintain high crop yields. Phosphorus has no substitute in food production. Therefore, securing the long-term availability and accessibility of phosphorus is crucial to global food security. However the major source of phosphorus today, phosphate rock, is a non-renewable resource and high quality reserves are becoming increasingly scarce. This thesis estimates peak phosphorus to occur before 2035, after which demand will exceed supply. Phosphorus scarcity is defined by more than just physical scarcity of phosphate rock and this thesis develops five important dimensions. For example, there is a scarcity of management of phosphorus throughout the entire food production and consumption system: the global phosphorus flows analysis found that only 20% of phosphorus in phosphate rock mined for food production actually reaches the food consumed by the global population due to substantial inefficiencies and losses from mine to field to fork. There is also an economic scarcity, where for example, while all the world’s farmers need access to sufficient fertilizers, only those with sufficient purchasing power can access fertilizer markets. Institutional scarcity, such as the lack of governance structures at the international level that explicitly aim to ensure long-term availability of and access to global phosphorus resources for food production that has led to ineffective and fragmented governance of phosphorus, including a lack of: overall coordination, monitoring and feedback, clear roles and responsibilities, long-term planning and equitable distribution. Finally, geopolitical scarcity arising from 90% of the world’s remaining high-grade phosphate rock reserves being controlled by just five countries (a majority of which are subject to geopolitical tensions) can limit the availability of phosphorus on the market and raises serious ethical questions. The long-term future scenarios presented in this thesis indicate that meeting future global food demand will likely require a substantial reduction in the global demand for phosphorus through not only improved efficient use of phosphorus in agriculture, but also through changing diets and increasing efficiency in the food chain. The unavoidable demand for phosphorus could then be met through a high recovery and reuse rate of all sources of phosphorus (crop residues, food waste, manure, excreta) and other sources including some phosphate rock. A ‘hard-landing’ situation could involve further fertilizer price spikes, increased waste and pollution (including eutrophication), increased energy consumption associated with the production and trade of phosphorus fertilizers, reduced farmer access to phosphorus, reduced global crop yields and increased food insecurity. A preferred ‘soft landing’ situation will however require substantial changes to physical and institutional infrastructure, including improved governance structures at the global, national and other levels, such as new policies, partnerships and roles to bring together the food, fertilizer, agriculture, sanitation and waste sectors for a coordinated response. Finally, this thesis proposes a new global goal – phosphorus security – to be integrated in the dominant research discourses and policy debates on global food security and global environmental change. Among other criteria, phosphorus security requires that phosphorus use is decoupled from environmental degradation and that farmers’ access to phosphorus is secured.

Orientador: Bernardo Mançano Fernandes / Resumo: A agricultura capitalista brasileira sempre esteve voltada para atender as demandas do mercado externo, apoiada em pilares que cumprem função de oferecer matéria-prima e disponibilizar mão de obra barata para a indústria. Estes pilares estão baseados na concentração da terra, no modelo agroexportador, na expropriação camponesa e na exploração do trabalho. Este modelo de produção intensifica a utilização do solo e o uso descontrolado de agrotóxicos, preocupando-se, exclusivamente, com a produtividade e o lucro. Na pós-revolução verde, o modelo capitalista de produção proporcionou inovações tecnológicas no campo com a introdução de novos insumos agrícolas, máquinas modernas e modificação genética das sementes. Porém, estas mudanças agrícolas somente se viabilizaram, pois os grandes latifundiários se apoderaram de créditos públicos subsidiados. Por outro lado, a agricultura não capitalista, baseada no trabalho familiar, ocupando áreas periféricas no meio rural e com baixa inovação tecnológica, é a principal responsável pela produção de alimentos e dos empregos no campo. Os camponeses utilizam a terra para produzir sua subsistência, bem como produzir alimentos para o conjunto da sociedade. A pesquisa mostrou que as áreas de reforma agrária contribuem para a produção de alimentos nos diferentes aspectos, seja para subsistência das famílias assentadas, seja para produção, industrialização e comercialização de alimentos para a população rural e urbana. No entanto, existem contradiçõ... (Resumo completo, clicar acesso eletrônico abaixo) / Mestre

Integrated aquaponic food production systems are capable of producing more food on less land using less water than conventional food systems, and marine systems offer the potential of conserving freshwater resources. However, critical factors such as suitable species combinations, environmental conditions (salinity and pH), and nutrient management (animal to plant ratio, C/N ratio, and dietary crude protein) have not been fully understood for marine systems. There were four objectives in this project. The first objective was to evaluate the growth performance of potential comparable combination (whiteleg shrimp with three halophytic plants) for the development of marine aquaponics with BFT under different salinities. The second objective was to evaluate stocking densities and the C/N ratio on growth and production of whiteleg shrimp and three halophytes. The third objective was evaluation of varying concentrations of dietary crude protein in practical diets fed to shrimp raised in biofloc aquaponic saltwater systems. The fourth objective was to evaluate effects of pH levels and additional C on the growth and production of whiteleg shrimp and five plant species in marine aquaponics. Four conclusions were determined: 1) Regarding marine aquaponics, whiteleg shrimp and the three halophytes (Atriplex hortensis, Salsola komarovii, and Plantago coronopus) are suitable combinations for future development. According to the research results, shrimp performed better in a salinity of 15 and 20 ppt; yet, plants performed better in a salinity of 10 and 15 ppt. Therefore, a salinity of 15 ppt is suggested as the optimal saline condition for shrimp and the three halophytes in an indoor marine aquaponics system. In addition, inoculating probiotics do have the efficiency of stabilizing water quality, cultivating microbial community, and enhancing the health of shrimp and plants in the operation of aquaponics. 2) The stocking density ratio and C/N ratio exerted significant impacts on the performance of shrimp and plants in marine aquaponics. Shrimp performed better with the stocking density of 2:1 and 3:1, with no impact from the C/N ratio. Conversely, plants performed better with the stocking density of 3:1 and 5:1 with the C/N ratio at 15. Therefore, a stocking density ratio of 3:1 with a C/N ratio at 15 is suggested as the optimal condition for shrimp and the three halophytes in an indoor marine aquaponic food production system. Inoculating the water with biofloc and applying probiotics regularly can enhance the management of water quality and the health of shrimp and plants in aquaponics. 3) Among the findings of the study, shrimp growth was not affected by the protein content of the feed, suggesting that it is possible to use feeds with lower protein concentration when culturing shrimp in biofloc-based marine aquaponics. However, plants grew better in the treatments with higher protein content feed in the early and middle stages of production. Hence, for maximum production, providing a higher protein concentration feed (35 %) in the early stages of system start-up, and switching to a lower protein concentration feed (30 %) in the later stages of cultivation might be feasible. 4) The current study found no significant effects of pH or additional C on shrimp performance. In contrast, plants grew better in lower pH treatments, while additional C supplements improved the performance of plants grown in higher pH treatments and had similar results to the lower pH treatments. We suggest that RO water is not suitable source of water for shrimp-based marine aquaponics if ionic composition is not managed. The addition of C, however, led to improved growth and yields of most plants. Hence, adding C can be a promising approach in marine aquaponics to enhance the resistance to the abiotic stress of plants and improve their growth.<div> <br>The present study on marine aquaponics has produced important findings that will fill some knowledge gaps, provide management guidelines for production, and facilitate its development. <br></div>

The main aim of my thesis is to create sustainable local food production in Jaroslavice region. This region is situated near the Austria – Czechia border. The political changes of previous century influenced this rural location a lot. Changes resulted in socioeconomic degradation of this area. My project tends to shorten production connections between producers and consumers. It also takes the part with local farmers and farmer´s market. My architecture proposal is a building of regional food center focused on fruit production. The main fruits are apples, apricots and pitches according to the local climate conditions. The center has three main parts – processing, storage and retail.

[pt] A Agenda Ambiental Global tem como uma das principais diretrizes a redução da pegada ecológica para a produção de alimentos. Parte desse desafio está associada a vastas áreas de pastagem degradadas. No Brasil, 70 porcento da área total de pastagem utilizada pela pecuária é diagnosticada como degradada, representando 118,3 milhões de hectares. Nesse contexto, algumas estratégias podem ser usadas para reverter esse cenário, sendo uma delas a transição para um sistema de produção agroecológico sustentável, como o Sistema Silvipastoril (SSP). Como Estudo de Caso para esta pesquisa, foi escolhida uma paisagem tropical e montanhosa na região Sudeste do Brasil, com baixo potencial de mecanização, fato que diminui sua competitividade no agronegócio, contribuindo para um longo período de declínio social, ambiental e econômico, principalmente a partir da década de 1950. O objetivo da pesquisa consistiu em avaliar o SSP como uma ferramenta estratégica para a recuperação de terras degradadas da Bacia Hidrográfica do Rio Paraibuna (BHRP), considerando as três dimensões da sustentabilidade: social, ambiental e econômica. Para isso, foram levantados dados de 6 fazendas de gado alimentado, exclusivamente, a pasto: 2 (duas) de pecuária degradada em monocultura (PDM); 2 (duas) de pecuária produtiva em monocultura (PPM); e 2 (duas) de pecuária produtiva em Sistema Silvipastoril (PPSP). Um conjunto de indicadores foi desenvolvido e utilizado para avaliar princípios e metas que orientam a transição de sistemas de produção convencionais para sistemas sustentáveis. Os resultados apresentaram uma escala progressiva de evolução na sustentabilidade entre todos os sistemas de produção pesquisados como: PPSP (0,75) maior PPM (0,61) menor PDM (0,42), nos aspectos social, ambiental e econômico, sendo 0,7 o ponto de equilíbrio para a sustentabilidade e 1,0 o máximo. Dessa forma, esta pesquisa apresenta o alto potencial do SSP como ferramenta estratégica para recuperar as 3 dimensões da sustentabilidade em terras degradadas. Os principais benefícios são: a adoção de boas práticas de produção; a capacidade produtiva do solo; a diversificação da paisagem; a vegetação nativa; a saúde e segurança no trabalho; a rentabilidade e segurança do investimento; e a lucratividade. / [en] One of the main guidelines of the global environmental agenda is lowering the ecological footprint for food production. Part of this challenge is associated with vast areas of degraded pasture. In Brazil, 70 percent of the total pasture area used by livestock is diagnosed as degraded, representing 118.3 million hectares. Some strategies can be used to reverse this scenario. One of these is a transition process for a sustainable agro-ecological productions system, such as Silvopastoral Systems (SPS). As a case study it was chosen a tropical landscape in a mountainous region in the southeast of Brazil. It has low potential for mechanization, which decreases its competitiveness in agribusiness, contributing for a long period of social, environmental and economic decline, especially after the 1950 s. This paper aims to evaluate SPS as a strategic tool for the recovery of degraded lands in the Paraibuna River Basin (BHRP), considering the three dimensions of sustainability: social, environmental and economic. We surveyed data from six grass-fed cattle farms: two of degraded monoculture pasture (DMP); two of productive monoculture pasture (PMP); and two of productive Silvopastoral System (PSPS). A set of indicators was developed and used to evaluate principles and goals that guide the transition from conventional production systems to sustainable systems. The results presented a gradual scale of sustainability evolution among all production system surveyed such as PPSP (0.75) PMP (0.61) DMP (0.42), in social, environmental and economic aspects, with 0.7 being the breakeven score for sustainability and 1.0 the maximum. In this way, this research presents the high potential of SPS as a strategic tool to recover the three dimensions of sustainability in degraded lands, being the main benefits, a better: production practices adoption; soil productive capacity; landscape diversification; native vegetation; health and safety at work; profitability and security of investment; and diversification income.

Water constraints for humans and nature are gaining more and more public attention as a critical environmental dilemma that needs to be addressed. When aquifers and rivers are running dry, the debate refers to an ongoing “world water crisis”. This thesis focuses on the water and agricultural production complexity in a global, regional and local perspective during different phases of development. It addresses the river basin closing process in light of consumptive water use changes, land use alterations, past and future food production in waterscarce developing countries in general, and a south Indian case study basin in particular, the Bhavani basin in Tamil Nadu. The study focuses on early phases of global agricultural development and addresses consumptive use and river depletion in response to land use change and irrigation expansion. It shows that focus must be shifted from a water use to a consumptive water use notion that considers both green and blue water resources. The Bhavani basin development trajectory reveals a dynamic interplay between land and water resources and different socio-political groups during the “green revolution” period. The present system has emerged as a step-by-step adaptation in response to hydro-climatic variability, human demands and infrastructure constraints. The study reveals three kinds of basin closure: allocation closure; hydrological closure; and perception wise closure. Many concerted actions on multiple scales have contributed to an increasing water use complexity even after closure. The study shows the extent to which natural variability hides creeping changes, and that the “average year” is a deceptive basis for water allocation planning. Future consumptive water requirements to feed growing populations in the developing world is analysed with a back-casting country-based approach. The study shows a doubling of water requirements by 2050 and how the challenge can be halved by increased water productivity. Since blue water accessibility for irrigation clearly will be insufficient, additional green water has to be acquired by horizontal agricultural expansion into other terrestrial ecosystems. The task will be substantial and increase the importance of global food trade. / Vattenbrist för människor och ekosystem är en mer och mer uppmärksammad miljöfråga. Sjunkande grundvattennivåer och uttorkade floder gör att många talar om en ”global vattenkris”. Denna avhandling fokuserar på de komplexa sambanden mellan vatten och jordbruksproduktion utifrån ett globalt, regionalt och lokalt perspektiv under olika utvecklingsfaser under fyra sekler. Den redogör för hur avrinningsområden överintecknas och slutligen ”stängs” för ytterligare vattenutvinning. Effekterna av ökad vattenutvinning i relation till historisk och framtida matproduktion analyseras generellt i utvecklingsländer med vattenbrist, och i detalj i en fallstudie i Bhavani avrinningsområde i Tamil Nadu i södra Indien. Studien visar för den tidiga jordbruksutvecklingen på global nivå hur förändrad markanvändning och bevattningsexpansion leder till förändrad balans mellan evapotranspiration och avrinning, med uttorkning av vattendrag som följd. Den visar vidare vikten av ett paradigmskifte där fokus flyttas från vattenanvändning till ”konsumerande” vattenanvändning, och som inkluderar både grönvatten- och blåvattenresurser. Analysen av Bhavaniområdets utvecklingskurva under det senaste seklets jordbruksutveckling visar på ett dynamiskt växelspel mellan land- och vattenresurser och mellan olika samhällsgrupper. Den nuvarande vattenanvändningssituationen har stegvis växt fram som en respons på hydroklimatisk variabilitet, människors behov och infrastrukturbegränsningar. Studien påvisar att ett avrinningsområde kan ses som ”stängt” på tre skilda sätt: när flödet är överintecknat, när utflödet sinar, och när vattenanvändare upplever att behoven överstiger tillgången. Även efter ”stängning” har etablering och intensifiering av vattenutvinning fortsatt och resulterat i ett alltmer komplext och sammanflätat vattenanvändningsmönster. Studien visar vidare hur hög hydroklimatisk variabilitet, dels gör att ”genomsnittlig vattentillgång” är förledande vid planering av vattenfördelning i ett avrinningsområde, och dels döljer smygande kumulativa effekter av ökad vattenutvinning. Slutligen anlyseras ländervis framtida vattenbehov för att möta matbehovet i världens utvecklingsländer, vilket visar på en fördubbling fram till 2050. Tack vare ökad vattenproduktivitet kan behovet emellertid halveras. Endast en bråkdel av det resterande behovet kan mötas genom ökad bevattning, dvs. med mera blåvatten. En stor del av vattenbehovet måste istället täckas med mera grönvatten via uppodling av andra terrestra ekosystem. Uppgiften innebär en betydande utmaning och global handel med jordbruksprodukter kommer att öka avsevärt i betydelse.

Durch die Nutzung des fischfutterbedingten Nährstoffeintrags für die kombinierte Produktion von Fischen und Pflanzen können Aquaponiksysteme eine nachhaltige Erweiterung von Kreislaufanlagen der Aquakultur (RAS) darstellen. Herkömmliche Aquakulturfutter zielen jedoch auf Fischproduktion mit geringer Umweltbelastung ab und sind somit nicht für die Aquaponik optimiert. Daher weist RAS-Wasser häufig Mängel im Profil gelöster anorganischer Pflanzennährstoffe auf. So war es Ziel dieser Arbeit, die Auswirkungen unterschiedlicher Proteinquellen auf die Nährstoffdynamik in RAS durch Fütterungsversuche mit Afrikanischem Raubwels und Nil-Tilapia zu untersuchen, bei denen Wachstum, gelöste anorganische Nährstoffkonzentrationen im RAS-Wasser und die Ausscheidung von Nährstoffen über den Kot verfolgt wurden. Der Fokus lag auf nachhaltigen alternativen Proteinquellen zu marinem Fischmehl und terrestrischen Pflanzenproteinen: Larvenmehl der Schwarzen Soldatenfliege (BSFM), Welsschlachtabfallmehl (CM), Geflügelschlachtabfallmehl (PM) und Geflügelblutmehl (PBM). Experimentalfutter, die phosphorreiches PM und CM enthielten, förderten erhöhte Ausscheidung von löslichem reaktivem Phosphor, erzeugten die besten gelösten N:P-Verhältnisse im RAS-Wasser verglichen mit einer Hydroponik-Nährlösung und ermöglichten in Kombination mit PBM besseres Wachstum beim Wels als ein vergleichbares kommerzielles Futter. In Futtern basierend auf einer einzigen Proteinquelle führte PM bei Wels und insbesondere bei Tilapia zu ähnlichem Wachstum verglichen mit marinem Fischmehl, wohingegen BSFM und PBM bei beiden Arten Wachstumsleistung beeinträchtigte. Meta-Analysen aller Versuche legen nahe, dass höherer Phosphor-, Kalium- und Magnesiumgehalt im Futter erhöhte Ausscheidung dieser Elemente in gelöster Form bedingt, was sie zu Zielnährstoffen in Aquaponikfuttern macht, während die Optimierung des Protein zu Energie-Verhältnisses im Futter die gelösten N:P- und N:K-Verhältnisse im RAS-Wasser verbessern kann. / By using the nutrient input from fish feeds for the combined production of fish and plants, aquaponic systems can be a sustainable extension of recirculating aquaculture systems (RAS). However, conventional aquaculture feeds are optimized for fish production and reduced environmental impact rather than aquaponics. Hence, RAS water is often characterized by deficiencies regarding its dissolved inorganic plant nutrient profile. Therefore, this thesis aimed to explore the effect of purposeful dietary protein choice on nutrient dynamics in RAS through four systematic feeding trials involving African catfish and Nile tilapia in which growth performance, dissolved inorganic nutrient concentrations in RAS water and solid fecal nutrient excretion were tracked. Focus was on sustainable alternative protein sources to marine fish meal and terrestrial plant proteins: black soldier fly larvae meal (BSFM), catfish by-product meal (CM), poultry by-product meal (PM) and poultry blood meal (PBM). Experimental diets including phosphorus-rich PM and CM supported increased excretion of soluble reactive phosphorus, produced the most favorable dissolved N:P ratios in RAS water when compared to a renowned hydroponic nutrient solution, and, combined with PBM, enabled better growth performance in African catfish than a comparable commercial diet. In single protein source diets, PM produced similar growth performance in African catfish and particularly Nile tilapia versus marine fish meal, whereas BSFM and PBM impaired growth performance in both species. Meta-analyses covering all trials suggest that higher dietary phosphorus, potassium and magnesium content leads to their increased excretion in dissolved form, making them target nutrients for aquaponic feed formulation, while the optimization of the dietary protein to energy ratio can further improve dissolved N:P and N:K ratios in RAS water.