Recirculating Aquaculture Systems - RAS

Nitrification Principle / Field Trials of Nitrification Efficiency

Nitrifying bioreactors are activated with consortia of nitrifiers by immobilizing them on an inert substratum designed as cartridge. They grow as biofilm and as water passes over nitrification is effected. The consortia consist of diverse flora of autotrophic nitrifiers as presented in the figures below.

  • NsV 443 (Nitrosospira sp.)

    NsV 443 (Nitrosospira sp.)

  • Nitrifiers inside cysts

    Nitrifiers inside cysts

  • NIT2 (Nitrobacter sp.)

    NIT2 (Nitrobacter sp.)

  • Ntspa 712 (Phylum Nitrospira)

    Ntspa 712 (Phylum Nitrospira)

  • Autotrophic Nitrifiers

    Cells having intracytoplasmic membranes & carboxysomes characteristic to the autotrophic nitrifiers

  • NmV (Nitrosococcus mobilis linneage)

    NmV (Nitrosococcus mobilis linneage)

  • DAPI stained consortia

    DAPI stained consortia

  • Diversity of the cells in the consortia

    Diversity of the cells in the consortia

  • EUB 338 (Bacteria)

    EUB 338 (Bacteria)

  • NSO 190 (β Ammonia Oxidizers)

    NSO 190 (β Ammonia Oxidizers)

  • NEU (Halophilic Nitrosomonas sps)

The nitrifiers function on Monod principle and have the capability to enhance activity with increase in the total ammonia-nitrogen loading as illustrated in the figure below. The outgoing ammonia concentration and NO 2 -N is maintained below 0.1 ppm even when the incoming ammonia concentration exceeds 0.5 ppm.

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*Field level validations have been conducted in live hatcheries and the results are summarized below.

About Us

Oriental Aquamarine Biotech (India) P Ltd offers a patented NITRIFYING BIOREACTOR TECHNOLOGY FOR THE ESTABLISHMENT OF RECIRCULATING AQUACULTURE SYSTEMS (RAS). Scientists at the National Centre for Aquatic Animal Health, Cochin University of Science and Technology, Kochi ( developed the technology with funding from the Department of Biotechnology, Government of India, New Delhi.

The Nitrifying Bioreactor technology facilitates management of water...


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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+91 422 2608943

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