Any recirculating system needs good biosecurity to hinder propagation of diseases, and to prevent sudden system crashes. The way the feed interacts with the system is also important in that regard, as sudden changes can cause a large impact to the water quality and waste removal dynamics.
At Skretting, we strive to produce the best possible feeds, and have dedicated programs in place to develop feeds specifically for recirculation purposes. In doing this, we can ensure the system can always perform at its most efficient capacity during the fish production cycle. We use our models to predict waste output from the fish, and to ensure that fish metabolites do not accumulate within the system. Monitoring of O2, CO2, N2, NH4++NH3, NO2-, NO3, and other physico-chemical parameters is key in determining the optimal performance of both fish and system, as it entails a fine balance between free-swimming and attached bacteria, solids removal performance and other procedures within the system.
When we are able to steer the feed to produce certain type and amount of metabolites, while closely assessing system performance, the system operates in a steady way, keeping water quality constant and ensuring optimal fish growth.