RAS Water Quality Awareness

NAFC Course Code: AQ65

Fish swimming in clear water


This half-day course provides a theoretical (classroom-based) introduction to the principles of monitoring and maintaining water quality in Recirculating Aquaculture Systems (RAS).

Entry Requirements



The course covers a variety of topics, including:

  • Background: recirculating compared to flow-through aquaculture systems.
  • Fish water quality requirements: oxygen, temperature, pH, salinity, ammonia, nitrite, and nitrate.
  • Principals of recirculation systems: nitrifying & denitrifying bacteria, start-up procedures, monitoring, bio-towers, fluidised beds, and filtration.
  • Common problems & what to do: crashes, oxygen / carbon dioxide, power cuts, clogging, ozone / UV, chemicals (disinfectants), and antibiotics
  • Fish health problems & treatment in recirculation units: ammonia poisoning / brown blood disease, bacterial gill disease, fungus, carbon dioxide, low oxygen, pathogenic bacteria, and heavy metals.


This is a half-day course delivered at the NAFC Marine Centre, or elsewhere by arrangement.


Courses are usually arranged to suit customers' requirements - please contact the NAFC Marine Centre.


  • £175

NOTE: For taught course delivery outside Shetland the lecturer's travel and other expenses will be charged in addition to these fees.

(Fees are subject to change without notice.)

Booking / Queries

To book a course please download an application form, or contact NAFC.

If you have any questions or need any more information please contact NAFC.