Aller Aqua said its new RAS feed improves FCR by 4%.

Aller Flow ‘helps RAS fish grow’

A new salmon feed developed for recirculating aquaculture systems (RAS) offers improved feed conversion ratios, claims its manufacturer.

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Aller Aqua said its product, Aller Flow, was created following the increasing global trend for large scale Atlantic salmon production in RAS farms.

Tested at Aller Aqua Research in Buesum, Germany, the feed will make a difference to the efficiency of the RAS as well as the economic result, said the Danish headquartered company.

“Aller Flow has been developed to enable the highest feed efficiency, not only in terms of growth but also feed conversion,” said Dr Robert Tillner, product manager at Aller Aqua.

Feed conversion

“Every digit in improved feed conversion means fewer nutrients to be handled by energy consuming filtration units in RAS.

“Keeping this in mind, we were able to improve the FCR by no less than 4% in Atlantic salmon fed Aller Flow compared to a competing RAS feed. That is a huge difference when producing several thousand tonnes of salmon.

“We have also significantly improved the faeces structure from fish fed Aller Flow compared to a competing RAS feed, meaning that the more compact and stable faeces are efficiently transported through and removed from the system by filtration units.”

Aller Flow, the latest addition to Aller Aqua’s recently launched Power RAS concept, contains no animal by-products and is available in 3mm and 4.5mm for salmon reared in RAS farms.