RAS Water Quality Awareness

NAFC Course Code: AQ65


This training course provides a theoretical introduction to the fundamentals of monitoring and maintaining water quality in Recirculating Aquaculture Systems (RAS).

Entry Requirements



Topics covered include:

  • 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.

Study Mode

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

There is no formal assessment.

Dates / Fees

See Scheduled Course Dates.

OR: Course dates can be arranged to suit your requirements - please Contact NAFC.

Fees: £125

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.)


This course is relevant to all persons operating or managing aquaculture recirculation systems.