biofilters in Recirculating Aquaculture System – The Core IAS

biofilters in Recirculating Aquaculture System

With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements:

  1. Biofilters provide waste treatment by removing uneaten fish feed.
  2. Biofilters convert ammonia present in fish waste to nitrate.
  3. Biofilters increase phosphorus as nutrient for fish in water.

        How many of the statements given above are correct?

        (a) Only one

        (b) Only two

        (c) All three

        (d) None


  • A biofilter is a bed of media on which microorganisms attach and grow to form a biological layer called biofilm. Biofiltration is thus usually referred to as a fixed–film process.
  • Biofilters convert ammonia nitrogen to nitrite nitrogen and then to the less toxic nitrate nitrogen for the fish 
  • 3rd correct as phosphorus as nutrient required for bones of fishesh