23-year-old Mattias Djurstedt studied science at Örebro University and when he wrote his master's thesis, he also got in touch with some experts in sustainable fish farming.
This in turn has led to the Swedish University of Agricultural Sciences, SLU, stepping in and now supporting the development of his fish farming.
The fish he grows is called Tilapia.
A tropical fish reminiscent of cod or pikeperch in taste and texture.
What makes the investment unique is that you grow in pools with closed water systems instead of keeping the fish in lakes or streams.
In this way, emissions can be minimized.
The feces from the tropical fish are "eaten up" by bacteria and microorganisms which the fish themselves then eat up.
In this way, an ecological cycle is created.
A problem for Swedish conditions is that the Tilapa fish like heat.
So their pools need to maintain a temperature of around 30 degrees.
Start the clip to watch the fishermen and hear more about Mattias Djurstedt's future plans