Norway-based salmon famer Nova Sea is launching the world's first recycled salmon netpen.

The netpen is completely made from recycled plastic and will soon be tested at a site in Nordland, in northern Norway.

The recycled cage comes from Nova Sea's own old netpens, and has been developed together with Norway-based aquaculture equipment and technology supplier Akva Group.

"The fact that the used cages will no longer be incinerated, but used again is nothing short of fantastic," Nova Sea technical manager Odd Stensland said.