Fish with an average weight of between 1.5-2kg have been placed in the Atlantis Subsea Farming development project pens at the Otervika facility on the border between Nordland and Trøndelag. There are 170,000 fish in each pen.
This is the first time that fish of this size have been put in the pens. One of the aims of keeping the fish at that depth is to keep them below the lice layer, and therefore lice-free. A submerged air dome allows the fish to refill their swim bladders.
Atlantis Subsea Farming is owned by salmon farmer SinkabergHansen, industry equipment supplier AKVA Group and AKVA’s biggest shareholder, Egersund Net.
The fish, from both Atlantis and SinkabergHansen, will remain in the submersible pens until harvesting this autumn. When the fish has been harvested, the project will be evaluated and conversion of the development permit to a permanent licence will be considered.
The fish were in good health and virtually free of lice when stocked. The lice development will be closely monitored by the Aquabyte automatic lice counting system.
“The fish quickly calmed down after release and we are now closely monitoring swimming speed, behaviour and feeding. The fish will learn to use the air dome to fill the swim bladder and get used to life at depth,” said project manager Trude Olafsen.
“There has been a fantastic effort from the entire project team to prepare everything for the release - not least from those who work at the site.”
The facility is rigged with four submersible pens to gain experience with several pens at one frame mooring. Based on the experiences from previous rounds, technical changes have been made to the cable and control system, buoys and air dome.