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Skretting introduces new RAS concept

Global aquaculture feed supplier Skretting is launching a new concept for recirculating aquaculture systems (RAS) called RecircReady.

November 29, 2018  By Hatchery International Staff

The concept takes into account growth and waste prediction models, nutrient recycling, fish and system health monitoring in addition to tailored feed solutions and their impact on the systems themselves, the company stated.

The technology incorporated into RAS allows for close supervision of waste and effluents, while tighter control over water quality and isolation from the external environment can help avoid biological risks. At the same time, RAS provides the opportunity to enhance feed management and scope to facilitate consistent growth rates throughout the production cycle. 

Developed by the Skretting Aquaculture Research Centre (ARC) through trials at its research facilities in Norway and Italy, Skretting’s feeds incorporate specific patented functional ingredients that bind faecal matter. In RAS this means it is easier to filter and remove solid waste particles, resulting in cleaner water and a healthier system.

“Our primary aim is to help farmers produce more fish in a more cost-effective and sustainable manner,” said Dr. Ingunn Stubhaug, researcher at Skretting ARC.


Skretting’s RAS feeds are designed to provide farmers with the best possible solution to optimise land-based production. They are based on three key deliverables: improving faeces quality and optimising mechanical filtration; reducing the nutrient load on biofilters through balancing high-quality raw materials; and maximizing fish growth potential and health.

Today, Skretting integrates the latest technology with model-based testing to ensure that the RAS-specific feeds continue to advance farm productivity and cost-efficiency. These AquaSim models are built on 20 years of data and provide parameters and predictive tools for comparing its feed and production practices.

As recently reported, Skretting’s RAS capabilities are also now supported by a new recirculation hall at Skretting ARC’s Lerang Research Station in Norway. Comprising 12 independent systems, predominantly conducting trials for salmon product development, this facility is used to investigate the impact of feeds and formulations on the biological filters in RAS. The recirculation facility has joined a global network of Skretting RAS research units, each with an explicit area of focus, and is expected to prove invaluable in servicing RAS customers.

“Many producers are looking for feed aligned with their own particular systems in terms of physical properties and behavior,” Stubhaug stated. “In RAS, you want the feed to reach all of the fish. You also want it to be consumed or to exit the system as quickly as possible. Consequently, some farmers want slower-sinking feeds while others want diets that move faster. This is one of the unique challenges presented by RAS and an area in which we have had a lot of success over the last decade.

“There is a lot of diversity in closed containment aquaculture, and it’s essential that producers have the right support to meet their specific requirements. At Skretting, we’re excited to be working with more RAS suppliers and farmers to meet their future needs.”

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