Operating a RAS Farm

Daily routines

• Check dissolved oxygen, temperature and pH in every tank at least twice a day, and more often at high density.
• Observe fish behaviour and feeding response before and during each feed; reduced appetite is often the first sign of trouble.
• Inspect drum filters, screens and sumps for blockages and confirm flow rates.
• Test ammonia and nitrite regularly; rising values signal biofilter stress or overfeeding.
• Remove mortalities promptly and record them.
• Confirm that backup power, oxygen and alarm systems are armed and functional.

Feeding and water quality are one subject

In a RAS, every gram of feed becomes either fish growth or waste that the treatment system must handle. Overfeeding raises ammonia, consumes oxygen and clogs filters. Underfeeding wastes growing time. Feeding to observed appetite, using appropriate pellet sizes and keeping accurate records are central to stability.

Caring for the biofilter

The biofilter is a living community of bacteria that needs oxygen, stable pH, adequate alkalinity and a steady supply of ammonia. New biofilters take weeks to mature. Sudden changes in feed load, temperature, salinity or medication can disturb them. Operators monitor alkalinity, dose buffering agents as needed and avoid shocking the system.

Solids and sludge handling

Removed solids are concentrated into sludge that must be stored, dewatered and disposed of or reused responsibly. Backwash water from filters is part of the farm's daily replacement water budget. Poor sludge handling undermines both water quality and the environmental case for recirculation.

Alarms and emergency response

Low oxygen, pump failure and power loss are the critical emergencies. Reliable alarms, tested backup generators, emergency oxygen supply and a written response plan that every operator understands are not optional in a stocked RAS. Response times are measured in minutes.

Records and continuous improvement

Good RAS farms keep records of water quality, feed, growth, mortality, energy use, maintenance and costs. Records make problems visible, support planning and allow the farm to learn from each cycle. The sustainability and farm-economics pages describe how these records feed into performance management.

The people who run it

Operating a RAS calls for a small team with complementary skills: husbandry and feeding, water chemistry, mechanical and electrical maintenance, and increasingly data handling. The Careers section describes these roles as learning pathways.