AOS online environmental data to SalMar

The SalMar central feeding center, on the island of Senja in Northern Norway, controls and monitors feeding operations for up to 14 of their salmon farm sites in the region.
2015 aos onlineImage: Alf Arild Jakobsen, Operations Manager at SalMar.

We are running two shifts a day with four workers on duty on each shift. They feed every day from four in the morning and until midnight, says Operations Manager Alf Arild Jakobsen.

In order to optimize this feeding process, SalMar has invested in the AOS system (AKVA Online System) with sensors that continuously log temperature and oxygen at all sites every 10 minutes. They recently also installed salinity sensors at one site and the AOS Sensor Buoy with Doppler current sensors at four other sites.

Alf Arild Jacobsen would like to share some of his experience with the readers of AKVA News, and explains; As we now continuously monitor oxygen levels in the cages during feeding, we see in some cases that the oxygen levels are low in the cages with small fish where we use lice-skirts. Larger fish seem to create enough water movement to maintain oxygen levels, simply by schooling in a circle. The data from all the sensors are online (web based) through the RealFish software solution. This enables real time control and adjusting the feeding based on true environmental data, such as to avoid feeding during periods of low oxygen.

We have also started using salinity sensors at one site in order to learn more how a surface freshwater layer affects the production. This is especially important in fjord areas with lots of freshwater coming from the mountains. By utilizing Doppler current sensors connected to the AOS Sensor Buoys we can also monitor currents, and build knowledge about how the current behaves and affects our operations. It is important for us to measure continuously at several depths. With this knowledge, we can optimize our feeding, avoid peak currents and position the Rotor Spreaders properly in the cages.

The system also enables efficient logging and analyzing of the data so that we can benchmark between sites and establish best practices. This has resulted in new knowledge and a better understanding of how this data affects our production. Now we are feeding fish in a different way than we did previously. Our central feeding center is quickly becoming a SalMar center of expertise based on true data from the AOS system, concludes Jacobsen.