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Microalgae As Fish Oil Replacement In Salmon Feed

The Fish Site
by The Fish Site
13 October 2011, at 1:00am

NORWAY - Are the fatty acids in certain microalgae suitable to replace fish oil in feed for salmonids? Masters student Chuyuan Zhang from the University of Saskatchewan in Canada is looking for answers at the Aquaculture Protein Centre in Norway.

In Norway, Ms Zhang is producing feed at APC and performing a digestibility trial on Atlantic salmon in sea water at Nofimas research station at Sunndalsra. There she will feed the fish, observe them, take samples of feed and faeces, and then analyse them.

Her work involves lab work and discussions with her co-supervisor and other fish nutritionists at APC. APC has close collaboration with the University of Saskatchewan on this industry funded project. Back in Canada, Ms Zhang is doing similar experiments with digestibility and growth on Rainbow trout.

I am particularly interested in finding out how well the fatty acids of the algae are digested, and if they affect the fatty acid profile of the fish compared to salmon that is fed fish oil, says Ms Zhang. She is also looking at other aspects, such as energy and protein digestibility.

We assume algae could be a very feasible product for fish oil replacement in feed for salmonids, says Ms Zhang.

Ms Zhang, who is from China, is in Norway for three months.

At home I learned a lot about tropical fish such as carp, and I got curious about other species. It was then very interesting to go to Canada and see large scale aquaculture production of salmon, and now in Norway. I really like working with fish, she says.

Ns Zhang is supervised by Dr Murray Drew of the University of Saskatchewan and Dr Margareth verland at APC. Dr Drew was a guest researcher at APC in 2010.

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