Flexibility & Reliability

Both salmonids and other species have proved to meet the highest quality when farmed in Kaldnes™ RAS systems.At first glance, increased growth rate (SGR) and high survival rate are obvious benefits. Furthermore, reduced stress and increased fish welfare are other advantages that Kaldnes™ RAS provides.

Kaldnes™ RAS meets the demand for flexible and reliable water chemistry. Sudden changes that may provoke potential harmful environmental factors, such as sludge accumulation are eliminated.

A central idea behind the Kaldnes™ RAS is low energy input. Therefore, head loss in Kaldnes™ RAS is kept to a minimum. Typical energy consumption rarely exceeds 2 kw/kg fish produced.

A costly input factor in intensive fish farming is pure oxygen. Kaldnes™ RAS therefore utilizes all available oxygen. Kaldnes™ RAS offer special low head oxygenating cones that ensures a full saturation with minimal pressure. Furthermore, excess available oxygen not consumed by the fish culture is utilized by the AnoxKaldnes™ Moving Bed biofilm reactor.

With proven fundamentals for more than 20 years, Kaldnes™ RAS takes fish farming to a new level!


  • Particle control down to Nano filtration


  • Maintenance free
  • Peak load resistant
  • Specially adapted for each client

Aeration and oxgenation

  • Removal of both carbon dioxide and nitrogen
  • Maximum utilization of added oxygen

Reabillity and operation

  • Smallest footprint possible
  • Operational friendly
  • No need for backflushing of the biofilter

Enviromental / sustainability

  • Reduced water consumption
  • Reduced energy consumption
  • Waste treatment
  • Improved feed utilization
  • Small foot-print