Recirculating Aquaculture Systems (RAS)

We are the global leaders in RAS

Today, Skretting is the market leader for feeds specifically designed for recirculating aquaculture systems.

About RAS

Recirculating Aquaculture Systems are land-based aquaculture facilities that reuse water by cycling it through a filtration system so it can be used again. The highly sustainable nature of these operations reduces the amount of water and space needed for aquaculture. The population of RAS-based facilities has grown exponentially and more are being implemented worldwide, year after year. The increased use of RAS represents a paradigm shift for aquaculture as they are becoming the standard, not only for early stages in freshwater, but the entire life cycle for many species.

RAS farming can be a fully controlled system offering a number of advantages and opportunities. Firstly, it alleviates the need for aquaculture to be in an existing environmental ecosystem that complements the species. This allows the convenience of diversity with species and location. Secondly, the overall health and growth of the species can be improved as water quality is carefully monitored to ensure conditions remain optimal. Some of the parameters monitored regularly include oxygen, carbon dioxide, pH, temperature, nitrite, nitrate and ammonia. Finally, RAS also requires very little water and space making it much more sustainable in comparison to traditional methods.

RAS come with their own unique challenges, in particular maintaining consistent water quality. The filtration of organic matter (physical and dissolved waste) produced by the aquaculture species needs to be efficiently removed by the system in order to reduce the water pollution. The system uses an array of filters including a live microbial filter (bio-filter) that is key in removing and reducing harmful dissolved waste. It is essential that all other filters remove excess waste and nutrients so that the microbial balance remains in this filter. It is imperative to only use optimal diets to decrease waste output and maximise filtration in order to maintain high quality water conditions thus improving growth, FCR, product availability and increased biomass.

The knowledge and expertise that Skretting continues to amass along with the R&D facilities that we have in place will prove invaluable as more and more of these systems come on stream.

An industry first

Skretting’s dedicated concept for RAS, RecircReady, was introduced to the global aquaculture market back in 2009 - an industry first. The concept takes into account modelling capabilities, nutrient recycling solutions and health monitoring in addition to tailored feed solutions, and was designed to provide farmers with the best possible solution to optimise land-based production.

Learn more about RecircReady

RecircReady graphic
Skretting feed

Feed the fish, feed the system

Skretting’s first feed for RAS was an industry milestone, designed to provide farmers with the best possible solution to optimise land-based production based on three key principles: improve faeces quality, make mechanical filtration more efficient, and reduce nutrient load for biofilters.

Consistency is important for RAS to successfully maintain the rearing environment. For this reason, we have meticulous procedures to ensure that the physical and nutritional quality is consistent from batch to batch. We also use turbidity testing to evaluate the impact water quality to validate the performance of the pellet in water.

See our feed solutions for RAS

RAS in the news

RAS equipment Skretting
Feednavigator on Skretting and RAS

Skretting, a pioneer in diets specifically designed for recirculating aquaculture systems (RAS), has upgraded its integrated feed concept for the closed containment farmed fish production method.

RAS equipment Skretting
Intrafish on Skretting and RAS

Skretting upgrades Norway research facilities with new RAS unit. The company added 12 independent recirculating aquaculture systems to its research center in Stavanger for land-based salmon, trout feed trials.

 

RAS facilities Skretting
The Fish Site on Skretting and RAS

Skretting, the world’s largest supplier of specialised recirculating aquaculture system (RAS) feeds, is ready to launch a new line of feeds called RecircReady.

Stories on RAS

11/10/2021

Atlantic Sapphire ASA and Skretting enter agreement to secure local feed supply

Skretting and Atlantic Sapphire ASA (“Atlantic Sapphire” or “the Company”) are pleased to announce Skretting’s intention to construct a specialized state-of-the-art feed plant for land-based salmon in Florida to serve Atlantic Sapphire’s US operations with market-leading feeds specialized for Bluehouse farming.

Read story
Charlie Granfelt
11/2/2021

Fit for future: introducing Skretting’s new Global Manager Closed Aquaculture Systems

Charlie Granfelt appointed to drive strategic innovation agenda and support progress in alternative farming technologies.

Read story
Skretting water
11/26/2019

Skretting wins global contract to supply Atlantic Sapphire in Denmark and USA

Skretting announces today that it has won the contract to supply Atlantic Sapphire with majority volumes from November 2019. The contract covers the majority of Atlantic Sapphire’s feed requirement in Denmark and the USA.

Read story

In this section

RecircReady
RAS Research
RAS technical guidance