Emissions from a medium-sized fish farming installation in the sea with a production of about 3000 tons of fish per year equals the total emissions from about 50000 people. This can “kill” the sea in the area if care is not taken. Primarily this consideration is taken care of by locating fish farms in robust and open areas. Danger signals are posted in Norway, and the Norwegian Pollution Control Authority is warning that stricter measures are coming.
In Asia this problem is well known in shrimp-farming, but dealing with it is not so easy. Pricing of environmental costs must become an issue again.