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The specific scientific and technological objectives of the case studies are: Case study 1: Switzerland
Actual fish species: Tilapia
Actual system: Integrated system - Combination of fish and economical valuable biomass production | | Economical objectives: | | Product diversification: | Improving product quality: | Improving production process profitability: | (1) To analyse the market potential and value of by-products, produced out of aquaculture wastewater (hydro-culture products and tropical fruits).
(2) To research economical advantages of integrating crustaceans in tilapia production | (1) To research the advantages for product quality when integrating crustaceans in the tilapia production.
(2) To research the advantages for product quality when combining biological wastewater treatment with integrated tickling filters. | (1) To analyse the 6-years experiences of the aquaculture system “Tropehuus Ruswil” in terms of costs and benefits, and of potentials for energy cost reduction.
(2) To research the feasibility of producing fish feed out of biomass, that was produced as by-product.
(3) To research the advantages for the process efficiency when combining biological wastewater treatment with integrated tickling filters. | | Ecological objectives: | (1) To reduce the wastewater discharge to surface waters to nearly 0% discharge.
(2) To increase biodiversity. |
Case study 2: Poland
Actual fish species: Carp
Actual system: Extensive pond aquaculture | | Economical objectives: | | Product diversification: | Improving product quality: | Improving production process profitability: | | (1) To diversify the produced fish species in common carp ponds (foreseen additional species: bighead carp, silver carp, grass carp, paddle fish). Research focus: Stocking regime and nutrient management. | (1) To compare the quality of fish (mainly taste) produced in monoculture with the quality of fish produced in polyculture. | (1) To reduce the application of energy and cost consuming artificial feed (agricultural fertiliser).
(2) To develop cost efficient fish feed by upcycling the aquaculture wastewater to biomass, and the biomass to feed pellets. | | Ecological objectives: | (1) To reduce the wastewater discharge to surface waters to nearly 0% discharge.
(2) To increase biodiversity. |
Case study 3: Hungary
Actual fish species: African Catfish, Pike and Pikeperch
Actual system: Intensive pond aquaculture | | Economical objectives: | | Product diversification: | Improving product quality: | Improving production process profitability: | (1) To research the production and the market value of Salix, cattail, reed, and others as renewable resources for the energy and the chemical industry and for the construction market
(2) To produce additional fishes for the local fishing tourism
(3) To produce low value fish as feed for the predatory fishes pike and pikeperch. | (1) To improve the meat quality of highly priced pike and pikeperch. | (1) To increase the economic efficiency of the production process by re-cycling and upgrading nutrients.
(2) To increase cost efficiency by spending less environmental penalties (wastewater). | | Ecological objectives: | (1) To reduce the wastewater discharge to surface waters to nearly 0% discharge.
(2) To increase biodiversity.
(3) To contribute to local climate stabilisation by increasing cooling-spot areas (constructed wetlands) |
Case study 4: The Netherlands
Actual fish species: Eel (partly Tilapia)
Actual system: Intensive eel (and partly Tilapia) aquaculture | | Economical objectives: | | Product diversification: | Improving product quality: | Improving production process profitability: | | (1) To extend efficient water and energy reducing technologies to eel and tilapia. | (1) To improve taste, health matters and growth behaviour of eel and tilapia. | (1) To reduce the water consumption in eel production to <50 l/kg feed and in tilapia production to <25 l/kg feed.
(2) To reduce the energy consumption of intensive eel and tilapia production systems. | | Ecological objectives: | (1) To reduce the water and the energy consumption.
(2) To reduce the emission of dissolved and particulate Nitrogen, Phosphorus, COD and organic matter to nearly zero. |
Case study 5: Denmark
Actual fish species: Trout
Actual system: Intensive trout aquaculture | | Economical objectives: | | Product diversification: | Improving product quality: | Improving production process profitability: | (1) To assess the economic and environmental potential and efficiency of combining intensive trout farming with growing specific crops in the constructed wetlands.
(2) To research and evaluate the economic potential in growing additional, alternative species like e.g. crayfish or different fry production in the constructed wetlands of trout farms. | (1) To improve taste, health matters and growth behaviour of trout. | (1) To optimise feed, feeding and farm management
(2) To reduce energy costs in recirculation through operation optimisation. | | Ecological objectives: | (1) To reduce the wastewater discharge to surface waters to nearly 0% discharge.
(2) To increase biodiversity. |
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