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The Icelandic Demonstrator in Axelwater was led by

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Mattis, along with the University of Iceland and

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partners from the industry.

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The demonstration is twofold, covering first processing of

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wild caught whitefish and second land-based agriculture

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of salmon.

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Let's start with the whitefish.

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The processing demo is mainly working with Atlantic

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cod and seith, processing them into fresh fillets

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and loins while managing by-products from various

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processing stages.

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We've gathered recoverable processing water, particularly from the

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water detectors and the filleting machines, and the

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process retains small particle proteins which are promising

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for valorization despite current limited utilization due to

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non-hygienic collection methods.

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In the project we've systematically identified and captured

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processing and runoff water, analyzing its content for

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protein recovery potential, and our results show that

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streams from the filleting machines and the water

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detectors are particularly rich in proteins suitable for

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producing high quality collagen hydrolysis.

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Despite the promising properties of these proteins, challenges

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in hygienic material collection and mechanical design persist.

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Effective water management has been enhanced by real

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-time monitoring using ultrasonic flow meters.

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This can lead to significant water savings, particularly

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through savings in de-icing operations.

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Our study highlights the need for improved collection

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techniques to maximize the use of processing water

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as a resource, reducing environmental impacts and further

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valorizing the processing chain.

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Land-based fish farming or aquaculture is an

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efficient method of producing fish, but it requires

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significant amount of water and resources such as

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feed.

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The Axelwater project aims to address these challenges

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by reducing water use and recovering valuable materials

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from the aquaculture process.

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The two main focus points of the aquaculture

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demonstration in Iceland have involved a redesign of

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the protocol used when bleeding the fish following

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slaughter and testing of an aquaculture sludge collection

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system.

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Bleeding of fish traditionally is done in tanks

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with continuous water flow, resulting in considerable water

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use.

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Further, the blood which accounts for two to

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four percent of the total weight of the

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whole fish is lost with the affluent water.

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The Axelwater project evaluated an alternative method of

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dry bleeding which entails bleeding the fish for

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a certain amount of time in air, providing

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the opportunity for blood collection, followed by a

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shorter period in water bleeding.

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Results showed that with this method water use

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in the bleeding process could be reduced by

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approximately 40 percent and we could shorten the

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bleeding time by about 50 percent without negatively

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affecting the quality of the fish.

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Further, this method provides an opportunity for valorization

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of the undiluted blood which can now be

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collected during the dry beating step.

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Land-based aquaculture also produces a solid waste

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often called sludge, consisting mainly of uneaten feed

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and fish feces.

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Our project tested an industrial scale dewatering system

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using filters and a screw press to transform

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the sludge into a stable nutrient-rich product.

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It contains high levels of phosphorus, nitrogen and

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other macronutrients, making it suitable as a fertilizer

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or fertilizer ingredient.

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And the final product is now being evaluated

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as a fertilizer on local agricultural fields and

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has been tested within the project as a

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fertilizer for salads.

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Implementation of these practical methods have the potential

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to reduce environmental impact of the land-based

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aquaculture by saving water and reclaiming valuable materials,

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demonstrating feasible path towards greater resource efficiency in

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agriculture operations.