Recirculating Aquaculture Systems - RAS


Food grade low density polyethylene beads are used as biomedia. The Bacterial Consortium grows as biofilm on the beads and removes Ammonia, Nitrites and Nitrates.


The beads have a diameter of 5mm and a surface area of about 0.785cm2

Stringed Bed Suspended Bioreactor contains 1001 beads with a surface area >684cm2.

Packed Bed Bioreactor contains 60 kgsof beads with a surface area of about 28.26m² and specific surface area of about 205 m²/m³.

Why Recirculating Aquaculture Systems

Aquaculture hatcheries currently use the open larval rearing system. The open larval rearing systems have been found to have certain shortcomings. These are illustrated in the figure below and explained subsequently.

In an open larval rearing system in a hatchery, there is continuous exchange of seawater on a regular basis. The quantum of exchange varies depending on the hatchery and could be as high as 100%. Due to the heavy demand of seawater in the production...


Recirculating Aquaculture Systems (RAS)

Recirculating aquaculture systems, or RAS, are closed-loop production systems that continuously filter and recycle water, enabling large-scale fish farming that requires a small amount of water and releases little or no pollution.

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