Aller Aqua has launched a new range of feeds designed specifically for RAS production. Photo: Aller Aqua.

Feed maker launches new range for RAS

Danish aquafeed manufacturer Aller Aqua has launched a new range of feed designed specifically for recirculating aquaculture systems (RAS).

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Aller Aqua product manager Robert Tillner said the development of the “PowerRAS” range was based on many years of research.

“We have kept up with the increasing sophistication of RAS, whilst focusing on the benefits for the RAS farmers. This is what will separate our feed from the competition,” claimed Tillner.

Robert Tillner: Kept up with increasing sophistication of RAS.

External factor

In the press release, Aller Aqua pointed out that the control measures in RAS technology allow for fish production under constant environmental conditions, making feed is the most influential external factor.

It added that feeds for RAS need to fulfil the requirements of the sophisticated and complex production technology by taking nutrient digestibility and palatability, faeces quality, fish metabolism and digestible protein / digestible energy ratio, technical quality of the feed and feed functionality to a new level.

What goes out is as important as what goes in, as low stability and weight of faeces dramatically reduces the removal efficiency by mechanical cleaning units, such as drum filters. 

Practical poo

Aller Aqua said that to develop the optimal feed for RAS it created feed formulations that ensured shaped and compact faeces particles that ensured an effective removal and the lowest possible impact of suspended matter on fish environment and filtration technology.

Other RAS-specific qualities include low dust, low leaching, high stability and optimal density and sinking speed.

The feeds have been optimised to reduce the contents of ammonia and nitrite levels in the water and relieve the biofilter. Bioactive components have been evaluated to shift the intestinal microbiome towards an improved gut flora and metabolic processes for enhanced fish health and sustainable performance.