Tag: Salmon farming

Reports

Optimization of salmonid bleeding and its effect on product quality and environment

Published:

08/06/2020

Authors:

Gunnar Þórðarson, Hildur Inga Sveinsdóttir, Sigurjón Arason

Supported by:

Environmental Fund for Aquaculture (ANR18011143), Rannís

Contact

Gunnar Þórðarson

Regional Manager

gunnar.thordarson@matis.is

Optimization of salmonid bleeding and its effect on product quality and environment

There is a great deal of experience and knowledge in the best way of bleeding cod, but residual blood in fillets is considered a quality problem; both in terms of appearance and as a result, residual blood causes storage during storage. One of the goals of the project was to improve the bleeding of salmonids, but it was not possible to complete it as no further funding was available. 

Salmon farming is an environmentally friendly protein production and it is important to minimize the environmental impact of the production. One of the goals of the project was to develop equipment for purifying processing water before it is returned to nature. New equipment has been installed at Arnarlax, but the company is a partner in the project.

Preliminary studies were carried out to develop future value from materials in processing water, and the task of the future will be to complete that work.   

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Reports

Extra raw materials from salmon farming - possible utilization and added value

Published:

05/09/2016

Authors:

Lilja Magnúsdóttir, Sæmundur Elíasson, Birgir Örn Smárason, Jón Örn Pálsson, Sölvi Sólbergsson

Supported by:

Westfjords Development Fund

Contact

Sæmundur Elíasson

Project Manager

saemundur.eliasson@matis.is

Extra raw materials from salmon farming - possible utilization and added value

With increased salmon farming in the south of the Westfjords, the amount of fish that dies during the farming season also increases, and since such raw material may not be used as feed for animals other than fur animals, it is all landfilled. Instead of a landfill, this raw material could possibly be used for biogas production and the biogas then used for energy production. Large numbers of dead fish will be released in the area in the coming years, so it is urgent to find an acceptable solution with regard to the impact on the environment and climate. In the project, all raw material streams in the southern Westfjords were analyzed with regard to biogas production, in addition to which possible locations for biogas plants and the transport routes of raw materials were examined. It was found that in order to be able to operate a biogas plant with dead fish as the main raw material, carbon-rich raw materials must be found for blending so that the decomposing organisms that decompose the raw material can fulfill their role. Carbon is obtained from barley and vegetables, among other things.

As the salmon farming in Westfjords increases the problem of dead fish and how to dispose of it increases as well. One of the solutions is to use the dead fish to produce biogas. In order to be able to produce biogas it is necessary to find resources that are high in carbon to blend with the fish. At the moment no resources of high carbon are available in the Westfjords.

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Reports

Use of canola oil in winter feed for salmon in the sea / Use of canola oil in winterdiets for Atlantic salmon

Published:

01/02/2014

Authors:

Jón Árnason, Jón Örn Pálsson, Gunnar Örn Kristjánsson, Ólafur Ingi Sigurgeirsson, Arnþór Gústafsson

Supported by:

AVS fund reference no. R 089‐12

Use of canola oil in winter feed for salmon in the sea / Use of canola oil in winterdiets for Atlantic salmon

An experiment was performed with different amounts of rapeseed oil (0, 50 and 80%) in winter feed for 570 grams of salmon raised in the sea with 28.2 ‰ salt (26 - 34 ‰) at an average temperature of 4.5˚C (3.8 - 5 , 6˚C). The fish doubled in weight during the 152-day trial period. TGC3 was an average of 2.9. The fat content of the feed had very little effect on the growth, feed intake, feed utilization and volume content of fish fillets. The composition of the feed fat did not have much effect on the color of the fillets, although fish that were fed only fish oil gave significantly (p = 0.017) lighter fillets than fish that were fed with rapeseed oil. The type of fat in the feed, however, had a significant effect on the fatty acid composition of the fat in both the feed and the fat in the fillets, especially the EPA, DHA content and the ratio of n-6 and n-3 fatty acids. However, the results show that the effect in the fillet fat is much smaller than in the feed fat, especially with the fatty acid DHA. It seems that DHA converts feed fat into fillet fat rather than using it as an energy source.

An experiment with different inclusion of Canola oil (0, 50 and 80%) in diets for 570 grams Atlantic salmon that was reared in sea water with average salinity of 28.2 ‰ (26 - 34 ‰) at average temperature of 4.5˚ C (3.8 - 5.6˚C). The fish doubled its weight during the 152 days trial period. TGC3 was on average 2.9. The fat type had had only minor effects on growth, feed intake, feed conversion and nutrient content in filet. The fat type in the diet did not have much effect on the filet color even though the fish that got feed with fish oil was significantly (p = 0.017) lighter in filet color than fish that got diets with Canola oil. Composition of the diets had market effect on the fatty acid composition of both dietary fat and filet fat in particular the content of EPA and DHA and the n ‐ 6 to n ‐ 3 ratio. However the results show lower effect in the filet fat than in the dietary fat, particularly regarding the content of DHA indicating that the fish is directing that fatty acid towards the storage lipid in the filet rather than using it as energy source.

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