I'm glad you asked that question because it relates to this idea of LNG ports and other human activities along the coastline.
Given that the goal of a protected area is really to protect the natural state of either a species or an ecosystem, many human activities along the coast are not necessarily compatible with that objective. In California, for example, we have waste water discharged from major municipalities like Los Angeles or San Francisco. We have cooling water discharged from power platforms. We have offshore oil platforms. We don't have as much offshore aquaculture activities, but, nonetheless, all of those activities tend to influence that local ecosystem where they are conducted. So in California the idea was to recommend to stakeholders that they avoid those areas of existing, and presumably, persistent human activities. It was suggested that you don't make a marine protected area in the waste water discharge of the city of Los Angeles, that as you craft the location of these protected areas, you could avoid those areas.
On the other hand, sometimes incorporating activities, especially aquaculture, within a protected area, allows you to evaluate what the effects of those activities are as well. For example, if you were monitoring the consequence of creating protected areas like in fjords, some of which do and don't have aquaculture activities, in the process of evaluating the protected areas you can compare those protected areas with and without that aquaculture and evaluate what those impacts are.