Use your googlefu and search "fish farming" or "fiskeoppdrett" which is our name for it.
I visited a fish farm belonging to my extended family when I was a small boy... it's more than 30 years ago. It is very much alike raising cows/bulls.
You have a facility on land where you milk fish for eggs, fertilize them and hatch them in large tanks. then you move them around to other tanks as they grow. When they are large enough you place them in fenced areas (pods) in the fjord itself.. much like cows on land. You feed them ... and harvest the fish pods when the fish are large enough.
There are university degrees here for this industry and we train many foreigners which take this knowledge home to start their own fish farms.
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